Vulkaanuitbarsting bij Canarische Eilanden #4

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Update 21/02 – 23:55 UTC
- We are ending the day with 15 earthquakes. 2 of these earthquakes had a magnitude equal or greater than 2.0
- A news article from Spanish news agency EFE, published in La Información (in Spanish), states that several boats will map the ocean depths of El Hierro. Below a summary of the article translated to English:
“The government will start from March 1st a bathymetric survey program (study of the deep ocean) on the island of El Hierro in order to continue monitoring the underwater volcano. This decision was taken today at a meeting chaired by the General Director of Civil Defense and Emergencies, Juan Antonio Diaz Cruz. These actions will take place as long as the eruption continues.
A schedule for the months of March, April and May has been set, with different vessels assigned to do the bathymetry with a periodicity of about 7 to 10 days. Boats will be from the State Navy, Police, Marine Rescue Society, Ministry of Fisheries and Department of Customs.”

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At the risk of being wrong, in the absence of more data comparing the time of arrival of the wave seismographs of the other islands and the data from the USGS, this morning, we had what we understand as a new event in Long Term, typical stratovolcanoes and comienzarían to appear in the system El Hierro, now isolated, the eruptive tremor and apparent shape. An LP, or event of long period, it is a harmonic moviento ie, resonance in a musical note and its harmonics, such low frequency that are not audible, but produced in volcanic conduits for fluids magma. These tubes act as the pipes of an organ. In the seismogram, are characterized by a very slow signal impairment that occurs, generating waves of various kinds. Enclosed is a summary of the most characteristic types of LPs, so they can "play" to classify and find out if indeed this is an LP (JR).


En een PDF

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Update 23/02 – 08:17 UTC - is El Hierro resembling Hawaii ?
- The earthquake activity continues as IGN listed 6 earthquakes so far today
- In our title we talk about Hawaii. Why ? Because a lot of scientists (not all of them) are convinced that both Hawaii and El Hierro are Hot Spot volcanoes, this contrary to subduction volcanoes like the Andes volcanoes (subduction means that the Oceanic plate dives below the continental plate and that part of the re-melted oceanic plate does create volcanoes by fissuring into the continental plate.

In case of Hot Spot volcanoes, we are (simplified) talking of weak points in the oceanic plates. The solid rock part of these plates (the crust) is very thin (10 to 15 km), below this thickness a variety of hotter material creates other sections (that is one of the main reasons why most of the earthquakes are occurring at a depth of 10 km or more). Magma tries to find weak areas in this material. This process can be found all over the ocean floors where hot vents and submarine volcanoes (if extinct also called seamounts) are doing exactly the same (there are thousands of them).
The Kilauea volcano on Hawaii, Hawaii (the big island) is just like El Hierro the youngest island of a volcano chain that grew above sea level. The older islands are moving away from the weakest point by the normal moving oceanic plates (10 to 100 mm per year depending on the location, which makes hundreds of km’s over millions of years). Maui, another extinct volcano island in the Hawaiian chain can be compared with La Palma, second youngest island in the Canary island chain.

The Kilauea volcano at Hawaii is constantly active since many years. Some periods are calm, but nevertheless the lava lake is partly filled and the eruption continues by channeling magma through lava tubes to the ocean. At regular times the eruption process intensifies and creates high intensity eruptions like a full crater lake, creating a stream of lava or even rift eruptions along the crater line. What El Hierro experiences at the moment is almost the same. Early November, a submarine rift eruption occurred (see video and pictures Guardia Civil / Involcan) and since many months the cone builds up by flowing lava (even today with limited HT).
Main difference with Hawaii : the depth of most of the earthquakes. The cracks in the Hawaiian crust are in average at a depth of 4 to 6 km, a lot shallower than the average El Hierro quakes.
We hope that “Wally” the ROV on board of the Atlantic Explorer will soon give us a proof of what is happening near the El Hierro main vent. If the crew of the Atlantic Explorer would succeed in delivering footage of the eruption, it would be a big blame to the other agencies working on this eruption.

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Update 26/02 – 17:53 UTC
- Strong degassing is currently going on
- 6 more earthquakes and 10 in total. Depth in between 10 and 12 km
- minimal harmonic tremor even with this strong degassing

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Update 28/02 – 19:20 UTC
- The depth of the cone is now 100 meters according to twitter from Cabildo de El Hierro, @PrensaElHierro. They also comment that there is a decrease in seismicity, deformation and gases release.

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NOTE AVCAN 464 - QUAKE-VOLCANIC ACTIVITY - IRON ISLAND - FEBRUARY 29 2012-11:00 pm peninsular - seismic-volcanic activity remains moderate, with seismicity today in the area of side peaks at the height of Julan Tanganasoga. Yesterday was in the del Golfo escarpment east of Tanganasoga and in the sea de las Calmas. Continues to be quite microseismicity detected but not located in the spectrogram. Continued volcanic tremor signal in the eruption of La Restinga, which remains low but is rising from day before yesterday, so it has already doubled the signal strength. New earthquakes five low Revised manitud +11. Magnitude of the new earthquakes between 1.7 and 0.8. Depths to 7.4, 8.6, 11.0, 11.6, 16.8 km). Yesterday 14. Yesterday 8. 3 are today. A total of 12,466 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).

DAY 29 FEB EARTHQUAKES. - Light green (3)
DAY 28 FEB EARTHQUAKES. - Light green (8)
DAY 27 FEB EARTHQUAKES. - Violet (14)
DAY 26 FEB EARTHQUAKES. - Pink (22) - 10 new

The earthquakes in recent days continue to occur in the NNE-SSW alignment from Frontera Sea de las Calmas and another thing to think that earthquakes are concentrated in the central area of the island and there are some more in the Mar de las Calmas. (Enrique)

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Update 28/02 19:20 UTC
- The depth of the cone is now 100 meters according to twitter from Cabildo de El Hierro, @PrensaElHierro. They also comment that there is a decrease in seismicity, deformation and gases release.

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@PrensaElHierro
The process of normalization of the eruptive process in # ElHierro. The cone is 100 meters, according to IEO.

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Update 02/03 – 23:42 UTC
- 4 more earthquakes , which bring the total to 5 today. Magnitudes were higher in average than during preceeding days : 1.8, 1.3, 1.9, 1.5, 2.0 and 1.2
- At least 2 faint jacuzzi’s today
- A further slight increase in HT (thank you ER reader Volcanomen). Wind is sometimes a disturbing element, but not in this case. Wind goes mostly down after sunset and the sea was rather calm tonight although HT still grows bit by bit. It cannot be excluded that HT suddenly inflates again. Lets keep our eyes open the following hours as any increase in activity may be well seen at the surface waters.
- The webcam has been set to very sensitive vision tonight. If a jacuzzi would form it will be easy to see it on the present settings.
- The webcam operator has been focusing on the sunset tonight ? The webcam turned into a romantic observer !

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NOTE AVCAN 467 - QUAKE-VOLCANIC ACTIVITY - ISLA DEL HIERRO - 03 MARCH 2012-11:30 h peninsular - seismic-volcanic activity remains moderate, with seismicity in the summit today and one in the sea de las Calmas. Yesterday afternoon at sea to N del Golfo, the del Golfo escarpment and the area of peaks, also give the Mar de las Calmas in NNE-SSE alignment. Continues to be quite microseismicity detected but not located in the spectrogram. Continued volcanic tremor signal in the eruption of the Restinga, which remains low even from the day February 26 is rising slowly but surely, now more than three times the lowest signal that day. New earthquakes 9. Magnitude of the new earthquakes between 2.2 and 1.2. Depths 10.6 and 13.8km (and two in a row to 21.0 and 24.2km). Yesterday 8. Yesterday 7. 4 are today. A total of 12,492 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).

MAR. - Dark Blue (4)
DAY 02 MAR EARTHQUAKES. - Yellow (7)
DAY 01 MAR EARTHQUAKES. - Light Blue (8)
DAY 29 FEB EARTHQUAKES. - Red (4)
DAY 28 FEB EARTHQUAKES. - Light green (8)
DAY 27 FEB EARTHQUAKES. - Violet (20) - 6 new
DAY 26 FEB EARTHQUAKES. - Pink (22) - 10 new

The seismicity map of what we have today concentrated 3 close together in the area of peaks and a solo by el Golfo while yesterday afternoon from the N in the Sea to the south through all areas but lining up some in the directions NNE-SSW and NNW-SSE. The previous day there is seismicity is diffuse in the Mar de las Calmas, the Julan, in el Golfo. On 29 morning in the area of side peaks at the height of Julan Tanganasoga. the 28 was in the del Golfo escarpment east of Tanganasoga and in the sea de las Calmas. The earthquakes in recent days and the new revised from 26 and 27 were continuing in the NNE-SSW alignment from Frontera Sea de las Calmas and another thing to think that earthquakes are concentrated in the central area of the island and there are some more in the Mar de las Calmas (Enrique).

1129851 02/03/2012 17:06:55 27.6632 -18.0436 13.8 1.9 mbLg SW EL PINAR.IHI
1129860 02/03/2012 19:27:57 27.8900 -18.0802 21.0 1.5 mbLg NW FRONTERA.IHI

1129854 02/03/2012 19:28:10 27.8152 -18.0645 24.2 2.0 mbLg NW FRONTERA.IHI
1129866 02/03/2012 22:25:43 27.7052 -18.0553 12.2 1.2 mbLg W EL PINAR.IHI
1129878 02/03/2012 22:59:39 27.7300 -18.0455 12.1 1.4 mbLg SW FRONTERA.IHI

1129879 03/03/2012 01:09:12 27.6656 -18.0647 1.4 mbLg SW EL PINAR.IHI
1129909 03/03/2012 06:41:42 27.7108 -18.0378 11.5 1.5 mbLg W EL PINAR.IHI 12490

1129908 03/03/2012 06:41:58 27.7158 -18.0329 10.6 1.7 mbLg W EL PINAR.IHI
1129910 03/03/2012 06:59:44 27.7123 -18.0344 11.0 1.2 mbLg W EL PINAR.IHI

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Update 06/03 – 15:25 UTC
- The red alert in the volcanic area of El Mar de las Calmas has been lowered to Yellow Alert, pre-emergency phase. The rest of the island will continue in yellow alert.
- The exclusion of areas of Arenas Blancas, Tacorón and Playa de Los Mozos will be also relaxed once a new document is released, soon, with the details of a smaller exclusion area. For now, the 4 mile maritime exclusion will remain.
- Recommendations for not swimming, fishing and scuba-diving will remain in place until new samples from the water in the area are analysed by the public health service, which could mean also these measures to be relaxed.
- All this information, in Spanish, from the press release here.

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Undersea Eruption Emergency Ends in Spanish Island

Madrid, Mar 6 (Prensa Latina) The authorities in the Canary Islands decreed on Tuesday the end of the emergency phase in the underwater volcano eruption area started in October last year at El Hierro Island, as informed by head of the Volcano Risk Civil Protection Plan in the Canary Islands (PEVOLCA), Javier Gonzalez.

He said the red alert in La Restinga fishing town was changed to yellow (pre-emergency) now.

The decision was announced a day after the scientific committee of PEVOLCA proclaimed the end of the volcano eruption registered in Las Calmas Sea, south of El Hierro Island.

Experts consider that though there is still some seismic activity, the eruptive phenomenon has concluded, six months after its start.

According to Carmen Lopez, from the National Geography Institute, the eruption phase has ended because no evidence of gasification or emission of material to the surface has been registered, in relation to the eruptive process started in October.

"We are still registering seismic activity, an indicator that the volcanic process is still on," she added.

According to the latest data registered in the area, the main cone of the undersea eruption is 288 feet from the surface.

Since mid July, 2011, El Hierro, the smallest, least populated island of the Canaries archipelago (268 square km and more than 10,000 inhabitants), has suffered over 11,000 quakes caused by magma activity on its subsoil.

The most powerful of them, of 4.6 degrees, was registered on November 11, 2011, and was also felt in Tenerife and La Palma islands.

The Canaries autonomous community is the active area with greater seismology risk in Spain, according to the country's Geology and Mining Institute.

Four of the Caraty Islands have historic volcanoes: El Hierro, La Palma (the Teneguia volcano), Tenerife (Teide volcano) and Lanzarote (Timanfaya volcano). La Restinga's eruption has been the first in this European country since 1971, when the Teneguia volcano erupted.

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NOTE AVCAN 471 - QUAKE-VOLCANIC ACTIVITY - ISLE DEL HIERRO - 07 MARCH 2012-12:30 h peninsular - seismic-volcanic activity remains moderate, with seismicity Today at Sea de las Calmas and west of the Island in the Sea, and yesterday in the sea de las Calmas, all in a NW-SE alignment. Microseismicity continues to be detected but not located in the spectrogram CHIE sensor. Continued volcanic tremor signal in the eruption of Restinga, increasing in the last 24 hours, although the signal remains low. The traffic light area is no longer eruptive or Red Siege to move to Amarillo to be terminated from the emergency phase of the PEVOLCA yesterday. All Island continues with the yellow light indicates volcanic risk alert, have more than one abnormally relevant parameter from the mean.

New earthquakes 3 +1 reviewed. Magnitude between 1.9 and 1.5. Depths to 7.1, 10.7 and 37.2km. Yesterday 4. Yesterday 2. Today will 2. A total of 12,512 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).


DAY 07 MAR EARTHQUAKES. - Pink (2)
DAY 06 MAR EARTHQUAKES. - Red (2)
DAY 05 MAR EARTHQUAKES. - Light Green (4)
DAY 04 MAR EARTHQUAKES. - Brown (2)
DAY 03 MAR EARTHQUAKES. - Dark Blue (7)
DAY 02 MAR EARTHQUAKES. - Yellow (7)

In simicidad map of the last days, as today is again in the sea de las Calmas and a very deep (37.2) to the west of the island in the Sea Yesterday seismicity was located in the sea de las Calmas , and with today are all in a NW-SE alignment with one of previous days. Before yesterday we had 4 earthquakes aligned in a NNE-SSW in Frontera, the Julan and the Mar de las Calmas. On March 4 there were two in the Julan. On March 3 there were 4 earthquakes close together in the area of peaks at about 10-12km and the rest of the seismicity in the Mar de las Calmas. On day 2 we had instead more and more moderate seismicity N, in the sea of the Gulf, the Gulf and area of peaks and one in the Mar de las Calmas (Enrique).

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Update 08/03 – 18:51 UTC
IEO the Spanish Oceanographic institute has released the results of the 11th bathymetry session (BIMBACHE1011‐11) . The cone depth was revealed already in the beginning of the week (88 meter depth).

La Restinga, El Hierro 10th March - Waves or Jacuzzi? 18:55 - 19:55 UTC

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The eruption of the Mar de Las Calmas is ongoing against the decisions of PEVOLCA, IGN and authorities (Fernando)

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Update 14/03 – 16:00 UTC – IMPORTANT UPDATE!
- The Atlantic Explorer has been able to obtain images of the volcano! They are the first to capture the submarine volcano in ‘El Mar de las Calmas’. The crew of QSTAR along with members of ‘Universidad de las Palmas de Gran Canaria’ and SOS Océanos worked very hard for this achievement. We should expect a detailed report tomorrow as Joke Volta reports.

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Update 15/03 – 22:31 UTC
- AVCAN reports that the Atlantic Explorer ROV Wally has fairly good images of the crater, gas emitting vents and even lava streaming out of the crater ! (what would e really a surprise as the PEVOLCA scientists have claimed that the eruption has ended.
- The ACN press / El Pinar webcam will end his broadcast on March 17. We have to admit that with tyhe present activity, the ACN press webcam was not important anymore as jacuzzi and stain are to faint to be seen
- Maria from SOS Oceanos wrote us in the morning that the ROV pictures will be published “when the University of Las Palmas” thinks it is opportune to do so. Well, we will have to wait then. The law of scientists and Universities is prevailing. The University of Las Palmas has chartered the Q-Star Atlantic Explorer and the ROV and keeps the images first for scientific purposes. We will bring it to you as soon as it is published.

Banco de peces que convive con el volcán submarino.avi

Flanco suroeste del cono principal del volcán submarino.avi

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VERY IMPORTANT Update 19/03 – 17:02 UTC
- ER reader Roland (see comments) has given us the lead to a report of the University of Las Palmas de Gran Canaria showing the still erupting submarine El Hierro volcano at a depth of 70 meter (this is 18 meter less than the last published data from the IEO High Tech bathymetry equipment!). What nobody could accomplish so far, has been done by the quite simple ROV E-Wally on board of the SOS-Oceanos, Q-Star, Atlantic Explorer ship by the scientists of the Universidad de Las Palmas the Gran Canaria.
- The images have been captured on March 14 as the date on the images reveal. The images are of course foggy as a lot of suspended material is polluting the water.
- No doubt that Q-Star and the University has also some video footage that they will probably release later on (the pictures are probably screen captures of the video).
We are however VERY PLEASED that all those who cooperated on this mission have proved :
a) that the depth of the erupting cone has decreased to 70 meter
b) that the eruptive process is not yet entirely finished (at least it was not after the date that Pevolca said that the eruption stopped).
Joke was “very excited” on March 14 after talking to the crew of the Atlantic Explorer as they stated already then that the ROV made images of glowing lava. As we could not see these images, we brought the news rather minimal.

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Update 03/04 08:01 UTC
Is this a sign of the awakening of the volcano ? To early to tell, but what we have seen so far today is the renewed activity of the feeder area at El Golfo. 3 of the 4 earthquake epicenters are located in the El Golfo area. The strongest M2.5 quake below the (new) volcano-vent itself.
4 earthquakes since midnight, the last one being the strongest. The 2.5 earthquake will have been surely felt by islanders and brings the memories back from the multiple earthquake they have felt a couple of months ago.

Update 02/04 18:43 UTC
- A video published by IGN shows a lot of degassing effects at depth of 100 to 150 m. We believe that the video has been captured by the Salvamar during his excursions the last couple of days. The water was very clear while videotaping? We congratulate CSIC with this video.

Así está el volcán de El Hierro.mpg

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Update 16/04 – 12:42 UTC
- 2 serious earthquakes in a matter of 12 minutes (Thank to ER reader Diana for telling us)
At first a Magnitude 3.1 earthquake at a depth of 14 km to the SW of El Pinar
followed by a second M2.2 earthquake at a depth of 1p km also to the SW of El Pinar

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Update 19/04 – 12:09 UTC
- In a short twitter message from the Cabildo de Hierro (office of Mr. Alpidio Armas), the Green Alert of the entire island has been declared by Pevolca. Due to the very slim activity of the last couple of weeks (only faint stains and degassing), the Alert level change seems logical to Earthquake-Report.com

twitter:

eruptionsblog twitterde op woensdag 09-05-2012 om 15:31:48 Check out this underwater video of the degassing lavas from the El Hierro eruption taken May 2:

Nuevas i‪mágenes del volcán submarino de El ‪Hierro

(via @PrensaElHierro) reageer retweet

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Forty years after the Teneguía Volcano (La Palma, 1971), a submarine eruption took place off the town of La Restinga, south of El Hierro, the smallest and youngest island of the Canarian Archipelago. Precursors allowed an early detection of the event and its approximate location, suggesting it was submarine. Uncertainties derived from insufficient scientific information available to the authorities during the eruption, leading to disproportionate civil protection measures, which had an impact on the islands economy based primarily on tourism, while residents experienced extra fear and distress.

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Update 14/06 – 13:00 UTC
- An increasing number of earthquakes, what is called an earthquake swarm, took place in the early hours this morning. Up to 19 earthquakes in less than 3 hours. Magnitudes have been high, with one reaching M 2.8. All depths in between 19 and 26 km. According to IGN this is normal and part of the seismic process and not the eruption.
-Map done by AVCAN website with full list of earthquakes here:

Event Date Time Lat Lon Depth
(km) Mag Location
1148498 14/06/2012 04:00:02 27.7251 -17.9972 20 0.5 NW EL PINAR.IHI
1148500 14/06/2012 04:32:09 27.7622 -18.0380 22 1.5 W FRONTERA.IHI
1148507 14/06/2012 04:40:20 27.7481 -18.0339 20 2.3 W FRONTERA.IHI
1148514 14/06/2012 04:46:49 27.7432 -18.0379 23 1.4 SW FRONTERA.IHI
1148515 14/06/2012 04:52:39 27.7834 -18.0411 24 1.9 NW FRONTERA.IHI
1148530 14/06/2012 04:59:27 27.7873 -18.0422 21 1.3 NW FRONTERA.IHI
1148531 14/06/2012 05:00:00 27.7596 -18.0381 26 1.4 W FRONTERA.IHI
1148542 14/06/2012 05:14:10 27.7519 -18.0415 22 1.6 W FRONTERA.IHI
1148536 14/06/2012 05:15:10 27.7306 -18.0264 22 1.9 SW FRONTERA.IHI
1148544 14/06/2012 05:22:16 27.7896 -18.0447 20 1.7 NW FRONTERA.IHI
1148546 14/06/2012 05:27:00 27.7569 -18.0432 23 1.3 W FRONTERA.IHI
1148547 14/06/2012 05:34:31 27.8004 -18.0500 19 1.3 NW FRONTERA.IHI
1148549 14/06/2012 05:34:56 27.7735 -18.0356 21 1.5 NW FRONTERA.IHI
1148559 14/06/2012 05:41:04 27.7853 -18.0509 21 1.8 NW FRONTERA.IHI
1148561 14/06/2012 05:54:22 27.8062 -18.0488 20 1.8 NW FRONTERA.IHI
1148562 14/06/2012 06:01:52 27.7644 -18.0395 22 2.3 W FRONTERA.IHI
1148563 14/06/2012 06:05:07 27.7794 -18.0525 22 2.8 NW FRONTERA.IHI
1148565 14/06/2012 06:06:20 27.7726 -18.0591 23 2.7 NW FRONTERA.IHI
1148568 14/06/2012 07:48:40 27.8015 -18.0680 21 2.1 NW FRONTERA.IHI

QSTAR - ULPGC V�DEO DE GRAN INTERÉS DE LA FILMACIÓN DEL VOLCAN SUBMARINO CON EL ROV

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Update 25/06 01:03 UTC
- our hispanic colleagues from AVCAN are requesting the authorities (IGN, Pevolca, ) to confirm or deny officially that a new eruptive vent has been opened. The current tremor shows increasing magma movement and AVCAN says that the population of El Hierro has to right to know what is happening below their island.

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1150917 25/06/2012 11:07:20 28.3512 -16.2121 17 Sentido 3.0 mbLg ATLÁNTICO-CANARIAS [+]
1150930 25/06/2012 09:24:56 27.6966 -18.0744 18 2.7 mbLg W EL PINAR.IHI [+]
1150922 25/06/2012 09:09:40 27.7017 -18.0685 18 2.8 mbLg W EL PINAR.IHI [+]
1150860 25/06/2012 09:03:44 27.7056 -18.0741 19 III 3.8 mbLg SW FRONTERA.IHI [+]
1150910 25/06/2012 08:41:05 27.7079 -18.0669 19 2.9 mbLg SW FRONTERA.IHI [+]
1150904 25/06/2012 08:40:32 27.7050 -18.0729 20 2.6 mbLg SW FRONTERA.IHI [+]
1150900 25/06/2012 08:34:16 27.7331 -18.0706 19 2.7 mbLg SW FRONTERA.IHI [+]
1150890 25/06/2012 08:26:26 27.7305 -18.0658 19 2.3 mbLg SW FRONTERA.IHI [+]
1150889 25/06/2012 08:10:13 27.7287 -18.0620 18 2.6 mbLg SW FRONTERA.IHI [+]
1150888 25/06/2012 08:03:48 27.7141 -18.0781 19 2.5 mbLg SW FRONTERA.IHI [+]
1150887 25/06/2012 07:47:21 27.7149 -18.0806 19 2.5 mbLg SW FRONTERA.IHI [+]
1150885 25/06/2012 07:43:09 27.7227 -18.0685 19 2.6 mbLg SW FRONTERA.IHI [+]
1150869 25/06/2012 07:37:13 27.7233 -18.0838 18 2.4 mbLg SW FRONTERA.IHI [+]
1150866 25/06/2012 07:36:51 27.7190 -18.0732 19 2.0 mbLg SW FRONTERA.IHI [+]
1150865 25/06/2012 07:31:30 27.7337 -18.0812 18 2.1 mbLg W FRONTERA.IHI [+]
1150854 25/06/2012 07:11:08 27.7165 -18.0680 18 2.3 mbLg SW FRONTERA.IHI [+]
1150851 25/06/2012 06:51:35 27.7249 -18.0535 18 2.8 mbLg SW FRONTERA.IHI [+]

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Update 25/06 11:12 UTC
- For those readers thinking that the current HT is an eruption, we have to deny this. This is mainly magma movement. A real eruption, like in early November, will show an almost FULL HT graph.
Since a few weeks ER is publishing a daily Volcanic Activity (Volcanic Seismicity) post (daily posts since 2 days). These posts are showing clearly what you should see when a real eruption is taking place. Example 1 Example 2 Example 3

Update 25/06 10:56 UTC
- IGN has not listed new earthquakes since 2 hours now, but is still adding ones who occurred before 09:03 UTC. Their current number is 61
- Based on the CHIE HT graph, more earthquakes are occurring since the latest M3.8 earthquake.
- HT seems to be calmed a little, but this means only that the Magma transport is probably blocked by a plug in the lava tubes system. It may take another strong quake or some time to open this.

Update 25/06 10:27 UTC
- 55 earthquakes listed so far today by IGN (in reality these are only the strongest ones bigger than 1.5). On a few exceptions all of the listed earthquakes are +M2.0. We would not be surprised that the real number of earthquakes (including the very weak ones which were included in the beginning of the eruption) would run into the hundreds (of course speculative).
- We are also convinced that if the eruption would be reactivated in the same cone at 88 meter of depth (like what happened in early November), a Surtseyan eruption will happen very rapidly. (Less than 100 meter is considered as a depth that Cypressoide action can start)
The location of the cone in the Las Calmas sea is far enough out of the coast to be considered as not dangerous for the population of the island. Only northern winds (which only happen now and then) can make a difference to that scenario.
At earthquake-report.com we think that the time has come to reinstall the WEBCAMS and to STOP PLAYING POLITICS (hiding information to the open public).

Update 25/06 10:12 UTC
- We are acquiring a Magnitude level that the main seismological agencies in the world will be picking up and reporting the El Hierro earthquakes. Mostly they start reporting from M4.0 onwards. Our own Daily complete list of earthquakes has been picking up the + M2.5 earthquakes.
- The last reported earthquake by IGN was at 09:03, but we see a number of new earthquakes since then on the HT graphs (bigger amplitude lines for some seconds).
- The current earthquake depth is not dangerous for the people on the island. BUT . if the magma finds its way up and a few extremely shallow quakes occur (less than 3 km) an eruption can occur in a short time. In many cases a M 4+ earthquake triggers the eruption when magma channels are blocked.
- We trust on IGN to follow up the depth and the most recent set of the earthquakes with their SECRET data.

Update 25/06 09:45 UTC
- Events are getting stronger and stronger. The strongest quake so far is a M3.8 at a depth of 19 km at 09:03 UTC. The earthquake was felt as an MMI IV (light shaking) at some parts of the island.
- We expect a PEVOLCA report much sooner than their proposed afternoon meeting as the strength of the quakes is getting stronger and stronger. So far the depth remains at approx. 20 km, but
- There is a tendency that the epicenter of the quakes moves gradually to the earlier Las Calmas sea area (towards the earlier eruption cone).
- If the present set of earthquakes keeps getting stronger, all options are open, but surely a new eruption is imminent.
- Of course we have to be prudent to predict what would probably comes up, but the authorities have chosen NOT to share all available data with the public. We do not know at this time how the following parameters are changing : recent GPS inflation values (horizontal and vertical), micro-earthquakes, gas emission, etc.

Update 25/06 -09:05 UTC
- The comment section was automatically closed after 270 days (yes 270 days ). ER reader Colin attracted our attention to it and it has been reopened (thanks Colin).
- PEVOLCA (committee of scientists and Safety people) will be meeting this afternoon and will be discussing the report of the IGN specialists). Until then, we do not expect any official news.
- AVCAN has mapped the quakes reported by the IGN (see below). The violet bullet the M3.4 of today, the red bullets are todays earthquakes (38), the green bullets those of yesterday (16) and the yellow bullets the 120 quakes from June 1 to June 23.

Animation of Earthquakes El Hierro 24-25th June.

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Update 25/06 18:12 UTC Pevolca press report (Gobierno de Canarias)
To most people, the decision of Pevolca will come as a surprise no special precautions whatsoever, not even at El Julan where most of the earthquakes are centering now.
The Pevolca decision is however motivated by the lack of deformation of the island, by the depth of the earthquakes and by the lack of gas emissions. 20 km is ok for IGN and INVOLCAN (scientific partners in Pevolca).
The press report is also stating that IGN is following up the earthquakes in Realtime (not 2 hours behind schedule like they do with the public). Lets hope IGN and PEVOLCA have taken the right decision. We have to stress that they have been always right so far.
Lets make however an important remark : the route towards the traditional submarine cone seems still to be blocked and we still have earthquake close to M3 going on. If a major M+4 occurs, all scenarios are open.

Update 25/06 18:55 UTC
- Seismicity is calming considerably the last couple of hours. It seems that the volcano has listened to the Pevolca board .
- 121 M+2 earthquakes until 17:37 UTC today (149 total M+1.4) (This does not take into account the probably hundreds of earthquakes below M1.4 which were registered in 2011, but are only visible now for the IGN and INVOLCAN volcanologists).

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Update 26/06 11:07 UTC
- 89 earthquakes so far today (IGN is still adding continuously).
- The location of the epicenter remains below the island and the hypocenter behave normal (18 20 km).
- The stronger earthquakes are in the M2.9 to M3.1 range. Most of the earthquakes are stronger than M2.0.
Important Update 26/06 10:30 UTC
- What looks in the seismogram as being a lot less activity than yesterday is not completely true as only the Harmonic Tremor (magma flow) has almost stopped completely. The accumulated pressure of the magma below the island is still very strong.
- Until 08:42 UTC, 77 earthquakes have been listed by IGN (M1.3 or stronger)

Joke Volta told us that she had felt the M2.9 which occurred this morning at 04:10 near El Pinar (05:10 local time). Joke lives in El Pinar. The IGN list, which is set up manually by IGN staff and is only published 2 hours after occurrence of the earthquakes, does not show a depth of this earthquake NOR does it show that this particular earthquake was felt by the people. Even more strange is that the depth of this earthquake has been plotted as EXTREMELY SHALLOW by the IGN plotted version of the quakes (see below). Why not mentioning the depth in the main list ? Are the values unsure ? The strength was strong enough to locate the depth (with an eventual error margin). We understand that a single shallow quake is not enough to be conclusive, but hiding information is from the past century.

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DISCLOSURE NOTICE INVOLCAN:

Urgently inform the records of the observed shift of the GPS network Canaria (Nagoya Univ ITER + + GRAFCAN) operating Volcanic Canary Island Institute under the direction of Dr. Takeshi Sagiya (Professor of Nagoya University and Scientific Collaborator INVOLCAN .)

GPS STATION PINA (El Pinar)

During the last 2 days there has been horizontal eastward displacement of 3 cm and north of 1.5 cm and a displacement in the vertical (elevation) of 3 cm.

These deformation data clearly reflect a process of movement of magma underground and the source responsible for this deformation is in the central-western part of the island of El Hierro in conjunction with data from recent seismic activity.

The movements recorded during the last 2 days are real and much faster than those observed last year 2011.

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Update 27/06 09:58 UTC

- Deformations, as described in the Involcan maps and report below, are generated by the Magma pressure and are one of the major indications to predict eruptions. Together with the strength of the earthquakes, the depth of the hypocenters and the emitted gases, they are used by volcanologists to send alerts and warnings to the public. The mitted gases are the uncertain factor in this case but didnt we hear a couple of months ago that some sampling points were dismantled ?

- The Involcan informative note is a real blame to the IGN and PEVOLCA communications policy. These organizations should review their communication policy urgently. We live in 2012 and when people feel the earth shaking almost constantly like in Sabinosa, you cannot get away with a message that the state of the island is normal, even if this is scientifically true. We know that we are repeating ourselves over and over again but the present situation becomes hallucinate.

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DISCLOSURE NOTICE INVOLCAN:

In the attached graph can observe the number of earthquakes above magnitude 2.5 have occurred since last year, thus covering the entire period of the process that is lived on the island of El Hierro. As you can see, in these last 48 hours the records of these earthquakes per day outnumber (enventos every 24 hours) than those recorded during the past year, which speaks of the power capacity of the process that is occurring now up on the island. So far identified 92 such events on 25 and 87 on 26.

twitter:

teideano twitterde op woensdag 27-06-2012 om 14:53:08 @eruptionsblog @rschott @Suw @Lumifg @pabloj_gonzalez @emsc @CPPGeophysics http://t.co/CFoOv2z8 Yellow alert at El Hierro reageer retweet

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DISCLOSURE NOTICE INVOLCAN

This image shows the evolution of the moving average daily flow of carbon dioxide diffuse registered in the ITER HIE01 geochemical station and the daily number of earthquakes located by the national seismic network of ign. The data recorded in the HIE01 until Wednesday June 27th, 2012 at 08:00 am show relatively low values ​​(average of 4 grams of carbon dioxide per square meter per day). Also you can see a pulse on the diffuse flux of carbon dioxide recorded from April 7 to May 20, 2012 that could be interpreted as a possible precursor signal of the recent seismic activity-strain that is being registered in El Hierro. It allows you to share this information but do not allow the dissemination and reproduction of this image without permission of INVOLCAN.

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Important Update 27/06 12:32 UTC
Pevolca calls a Yellow alert in the unpopulated earthquake zone. In a live interview on RTVC, the local Canary Island TV and Radio station, María josé jurado has declared that the El Julan and La Dehesa area will be labeled as Yellow Alert area. Besides a church and a lighthouse, this area is unpopulated.
The move sounds logic to ER as the direct treat to other areas for eventual earthquake damage is very limited. Earthquakes are the main risk at this moment.

twitter:

eruptionsblog twitterde op woensdag 27-06-2012 om 15:39:48 Alert status raised to "Yellow" for parts of El Hierro as seismicity and carbon dioxide emissions continue to increase: http://t.co/lp9BND5t reageer retweet

twitter:

canariesnews twitterde op woensdag 27-06-2012 om 15:45:25 Alert level raised to 'yellow' on El Hierro due to recent seismic activity - http://t.co/pxkbo2qc reageer retweet

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Update 27/06 – 16:36 UTC
Almost all the recent earthquake’s epicenters are gradually migrating south into the Las Calmas sea. The denomination ” SW FRONTERA” are gradually replaced by “W EL PINAR” when the epicenter is located in the Las Calmas sea.
The migration to the new area can also be observed in the existence of harmonic tremor which started also around 14:00 UTC.
It looks now that HT is diminishing again and that the earthquakes will remain in the same area until new HT appears (possibly started by some strong earthquakes).

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Update 27/06 – 19:45 UTC
The earthquakes epicenters are currently located at the same area where it all started on September 27, 2011. The depth at that time was approx. 15 to 17 km. The current depth is more in the 19 to 21 km range . The difference in between the 2 layers is a couple of kms. (All our readers can come to the same conclusion in comparing the location and the depth of the 10 days of earthquakes who started on September 27 and todays location of the quakes). All this is not conclusive in what will happen next.

Update 27/06 – 19:01 UTC
Joke has just SMS’t (texted) that she has felt a strong shock in El Pinar.
The earthquake Joke has just reported was a M4.0, the strongest earthquake since last year.
As you will be seeing on the map, the epicenter is located below the Las Calmas sea floor.
18:55:08 27.6883 -18.1006 Depth 20 km Sentido M 4.0 mbLg W EL PINAR

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Update 28/06 07:55 UTC
- At least the people of El Hierro must have had a good night sleep as the strength of the earthquakes decreased seriously the last 7 hours. But only the strong earthquakes were more or less silent at night.
- So far today IGN has listed 39 earthquakes since midnight, a little less than the preceding days, but still a high number.
- Harmonic Tremor has restarted strongly since 05:35 this morning, showing us that the volcanic process is still continuing strongly. As we have experienced the last couple of days, the current HT may refer to a new migration of the epicenters
- The strongest earthquake since midnight was a M2.8 earthquake. NO earthquakes since midnight have been marked as felt by the people. At ER we think that Felt or no felt indications are far from reality as most people do not indicate slight tremors anymore after having experienced stronger ones. Aftershocks in general are less documented. Only nations like Japan, USA and New Zealand are drilled to report whatever they have felt.
- The depth did not show a lot of difference since midnight with values in between 17.6 and 22.9 km
- The epicenter of the earthquakes since midnight remains the El Julan La Dehesa area of the island
- We certainly expect more earthquakes to come today as the process continues in full strength.
- What can change the process fundamentally ? Our readers should watch the following elements in the current process with more focus than the rest : Depth of the earthquakes (changes towards a depth of 15 km or less can be triggers of new events, sudden change in the strength of the earthquakes, the locations of the epicenters (these locations are important in relation to the conduits of the recent eruption)

twitter:

teideano twitterde op donderdag 28-06-2012 om 13:46:34 GPS Deformation at VALV station, the remotest one from the actual seismic swarm also reflects the activity. #volcano http://t.co/ocjlZWKK reageer retweet

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DISCLOSURE NOTICE INVOLCAN

In the attached image you can check the movement experienced by the GPS station located in Valverde. In the same motion can be seen clearly from the northeast, with an eastward shift of nearly 1.7 cm, and northward nearly 2.

Confirm and emphasize the horizontal and vertical displacements observed by GPS network Canaria (ITER + + GRAFCAN Nagoya University) operating Volcanic Canary Island Institute under the direction of Dr. Takeshi Sagiya (Professor of Nagoya University and Scientific Collaborator INVOLCAN)

These data confirm feformación a process of movement of magma underground, and the source responsible for this deformation is in the central-western part of the island of El Hierro in conjunction with data from recent seismic activity.

The displacements recorded during these last days are real and much faster than those observed last year 2011

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Update 28/06 12:26 UTC
- The Oceanographic vessel Hesperides has been announced to arrive soon at the El Hierro waters. What the ship exactly will do is unknown (analyzing sea water looks evident to us) as the bathymetry will not have changed since the first eruption stopped a few months ago.
- Yesterday we have cut a big chunk from our main article. These parts are now saved in part 44 and 45 of the El Hierro volcano eruption history. The links to all the preceding parts can be found at the bottom of this page. We will soon cut another part of this page as it is reaching a critical size to be easily consulted by people with limited bandwidth like Colin.

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Update 28/06 – 21:50 UTC
- Everything looks rather normal today and people get used to the present conditions. Less strong earthquakes than yesterday bring a king of relief to the living conditions
- The process is however continuing just like the preceding days. IGN has listed 164 earthquakes so far, less than yesterday but still en enormous number.

Update 28/06 – 20:24 UTC
-Thanks to ER readers Sissel and Mafl who gave us both routing informations of the SAR aircraft and the Hesperides ship, we were able to see in the public domain the routing of both the aircraft and the ship.
Wat we earlier described as probably shipping related is not so sure anymore after gluing the 2 pictures together. It is of course normal that the authorities will not publish every move they are ordering in their research.
We also checked the NASA satellite image today, but it was to hazy to trace eventual discoloring . The common researched area is approx. 20 km to the south of La Restinga.
After some Ocean depth checking in Google earth, we found out that the submarine volcano cone were the plane and ship were circling is at a depth of 2000 meter (we know that that is not accurate, but it gives a clue of how deep we expect the volcano or seamount to be). Maybe todays flight and ship route were only meant to do some long planned research which has nothing to do with the current activity.
Update : As we were intrigued by this story, we remember an issue which occurred on October 10 2011, just before the sea at El Hierro started to color green. This is the text we wrote on October 10 (part 2 of the El Hierro story ) :
Following the Spanish Newspaper El Mundo, a small submarine eruption has taken place 7 km out of the coast. The eruption occurred at 1200 meter below sea level. The eruption took place in the Las Calmas sea to the south of the island at 10.43 local time (09:43 UTC). We expect an official statement soon.
The news comes from 4 boats presently navigating in the Las Calmas sea.
- The present conditions are however totally different than on October 10 (earthquake parameters). Another difference is that todays action took place at approx. 20 km out of the coast.

Nubes de hipocentros de la crisis sismo-volcánica en junio de 2012 en El Hierro

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DISCLOSURE NOTICE INVOLCAN

In the attached image you can check the hypocentral evolution of earthquakes in the island of El Hierro since last July 2011. The same can be checked as there are two periods of clear tendency to make them deeper, and the absence of shallow earthquakes in this phase.

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[bon]
The permanent GPS network INVOLCAN instrumental movements continued to show abnormal El Hierro

These ground deformation data "not perceptible to people," confirms a rise in magmatic reactivation under the island of El Hierro

The Institute of Volcanic Islands (INVOLCAN) reports that continue to be recorded anomalous horizontal and vertical displacements in El Hierro in the Canary GPS network operated by the INVOLCAN under the direction of Dr. Takeshi Sagiya, Professor of Nagoya University and Scientific Collaborator INVOLCAN.

During the last 4 days to confirm the registration of a horizontal shift to the Northeast (4.4 cm) and as an offset in the vertical (elevation of 3 cm) in the GPS station WNBF (http://www.seis.nagoya-u.ac.jp/sagiya/canary_gps/FRON.pdf) located in the City of La Frontera and a horizontal shift to the Northeast (4.5 cm) and a shift in the vertical (elevation of 4, 5 cm) in the GPS PINA located in the City of El Pinar (http://www.seis.nagoya-u.ac.jp/sagiya/canary_gps/PINA.pdf). By contrast, in the GPS VALVE, located in the building environment of the Cabildo of El Hierro (http://www.seis.nagoya-u.ac.jp/sagiya/canary_gps/VALV.pdf), no observed shift in the vertical, but horizontal displacement to the northeast (2.6 cm) over the last 4 days.

These deformation data "not perceptible to people," confirms a process of movement of magma beneath the island of El Hierro, and the source responsible for this deformation is in the central-western part of the island of El Hierro in conjunction with the recent seismic activity data. The movements recorded during the last 4 days are real and much faster than those observed last year 2011.

From January to June 2012 were recorded displacements of less importance, but still significant, the GPS stations located in Valverde (VALVE, east), La Frontera (WNBF, shootings) in the Restinga (REST, to the southeast and elevation), El Pinar (PINA, to the east) and Sabinosa (SABI, began to move slightly to the north).

The Red Canary GPS is a network of 35 permanent geodetic instruments GPS stations whose ownership depend on different agencies and administrations but perform a joint commitment to contribute to the improvement and optimization of geodetic software for volcano monitoring in the Canary Islands and has the ability to detect any ground deformation associated with volcanic phenomena in depth. In the case of El Hierro, Canary GPS Network currently has 7 stations ITER differential GPS (2), Nagoya University (4) and GRAFCAN (1).

At present the data on the geochemistry INVOLCAN is getting applied to volcano monitoring of the volcano island of El Hierro is delimited to the registration of permanent instrumental network geochemistry in the Island of the Meridian with 5 stations geochemical ITER. Therefore, at present it is unknown which is the amount of carbon dioxide and emission levels of helium-3 that the emerged part of the volcano island of the iron being emitted to the atmosphere; geochemical parameters of interest to evaluate both the current upsurge in magmatic reactivation under the island of El Hierro.

The emission of carbon dioxide that is being registered in HIE01 geochemical station, located at the intersection of the three main volcano-structural El Hierro, does not reflect outliers moving average values ​​were recorded daily during the last 7 days of 4 grams carbon dioxide per square meter. Nor are occurring outliers emission of carbon dioxide in HIE06 geochemical station, located in the area of ​​the volcano sumital Tanganasoga, whose record of daily moving average values ​​over the last 7 days is 0.8 grams carbon dioxide per square meter. In both stations are not being detected geochemical emissions of hydrogen sulfide.

These results have been obtained thanks to MAKAVOL project "Capacity Building of R & D + i + d to contribute to the reduction of Volcanic Risk in Macaronesia (MAC/3/C161)" which is being co-funded by the program Transnational Cooperation European Union Madeira-Canary-Azores (MAC 2007-2013), and the collaboration of the Research Center for Seismology, Volcanology and Disaster Mitigation, University of Tokyo (Japan), GRAFCAN (Canary Islands Government) and as of the Island Councils of Tenerife and El Hierro and the municipalities of La Frontera and El Pinar.

The Institute of Volcanic Islands (INVOLCAN) or National Center for Volcanology is an institution demanded unanimously by the Senate (2005), Parliament of the Canary Islands (2006) and House of Representatives (2009) which calls for an urgent and pressing to the General Administration State and the Canary Islands and the Island Councils to the joint commitment of all human and technical resources that various intended for scientific management of volcanic risk in Spain (say Canaries, the only volcanically active region volcanic country risk) without incurring the loss of ownership of their resources and in order to ensure effective coordination and efficient to reduce volcanic risk in the Canaries. To date, the Cabildo Insular de Tenerife is the only administration that has been involved with this unanimous decision of the legislative chambers in this country.

From INVOLCAN is recalled that the official information on the level of alert to adverse volcanological phenomena which is output from the communications of the Special Plan of Civil Protection and Emergency Response for Volcanic Risk in the Canary Islands (PEVOLCA) .

Caption
HIE06 geochemical station located in the area of ​​the volcano sumital Tanganasoga and which has the emission of carbon dioxide and hydrogen sulfide as well as numerous meteorological variables.

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DISCLOSURE NOTICE INVOLCAN

During the last 4 days to confirm the registration of a horizontal shift to the Northeast (4.4 cm) and as an offset in the vertical (elevation of 3 cm) in the GPS station WNBF

These deformation data "not perceptible to people," confirms a process of movement of magma beneath the island of El Hierro, and the source responsible for this deformation is in the central-western part of the island of El Hierro in conjunction with the recent seismic activity data. The movements recorded during the last 4 days are real and much faster than those observed last year 2011.

From January to June 2012 were recorded displacements of less importance, but still significant, the GPS stations located in Valverde (VALVE, east), La Frontera (WNBF, shootings) in the Restinga (REST, to the southeast and elevation), El Pinar (PINA, to the east) and Sabinosa (SABI, began to move slightly to the north).

quote:

[bron]
By contrast, in the GPS VALVE, located in the building environment of the Cabildo of El Hierro is not observed in the vertical displacement, but the horizontal displacement to the northeast (2.6 cm) during the last 4 days .

These deformation data "not perceptible to people," confirms a process of movement of magma beneath the island of El Hierro, and the source responsible for this deformation is in the central-western part of the island of El Hierro in conjunction with the recent seismic activity data. The movements recorded during the last 4 days are real and much faster than those observed last year 2011.

From January to June 2012 were recorded displacements of less importance, but still significant, the GPS stations located in Valverde (VALVE, east), La Frontera (WNBF, shootings) in the Restinga (REST, to the southeast and elevation), El Pinar (PINA, to the east) and Sabinosa (SABI, began to move slightly to the north).

quote:

[bron]
During the last 4 days to confirm the registration of a horizontal shift to the Northeast (4.5 cm) and a shift in the vertical (elevation of 4.5 cm) in the GPS PINA located in the City of El Pinar.

These deformation data "not perceptible to people," confirms a process of movement of magma beneath the island of El Hierro, and the source responsible for this deformation is in the central-western part of the island of El Hierro in conjunction with the recent seismic activity data. The movements recorded during the last 4 days are real and much faster than those observed last year 2011.

From January to June 2012 were recorded displacements of less importance, but still significant, the GPS stations located in Valverde (VALVE, east), La Frontera (WNBF, shootings) in the Restinga (REST, to the southeast and elevation), El Pinar (PINA, to the east) and Sabinosa (SABI, began to move slightly to the north).

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Update 29/06 – 13:43 UTC
- 105 earthquakes so far today ! The weakening of the process has been reversed the last couple of hours (stronger).
- Since 12:41 UTC, harmonic tremor and earthquakes started to pick-up again.

quote:

Since last June 24 recorded a horizontal displacement to the north (5.5 cm) and as an offset in the vertical (elevation of 6.0 cm) in SABI GPS station, located in the town of Sabinosa.

These deformation data "not perceptible to people," confirms a process of movement of magma beneath the island of El Hierro, and the source responsible for this deformation is in the central-western part of the island of El Hierro in conjunction with the recent seismic activity data. The movements recorded since June 24 are real and much more rapid than those seen last year 2011.

From January to early June 2012 significant shifts were occurring but minor GPS stations located in Valverde (VALVE, east), La Frontera (WNBF, shootings) in the Restinga (REST, southeast and elevation), in El Pinar (PINA, to the east) and Sabinosa (SABI, began to move slightly to the north).

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In the attached image you can see the seímos of more than 2.5 degrees occurred on the island of El Hierro from last year to yesterday at 23.59 hours. As you can see, the process in which we are immersed releasing a very high energy. From the last 25 there were at least 353 earthquakes with this condition (magnitudes greater than 2.5).

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INVOLCAN DISCLOSURE NOTICE: GPS REST

Since last June 24 there was an eastward horizontal displacement (5.2 cm) and as an offset in the vertical (elevation of 4.66 cm) in REST GPS station located in the village of La Restinga.

These deformation data "not perceptible to people," confirms a process of movement of magma beneath the island of El Hierro, and the source responsible for this deformation is in the central-western part of the island of El Hierro in conjunction with the recent seismic activity data. The movements recorded since June 24 are real and much more rapid than those seen last year 2011.

From January to early June 2012 significant shifts were occurring but minor GPS stations located in Valverde (VALVE, east), La Frontera (WNBF, shootings) in the Restinga (REST, southeast and elevation), in El Pinar (PINA, to the east) and Sabinosa (SABI, began to move slightly to the north).

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INVOLCAN DISCLOSURE NOTICE: GPS SABI

Since last June 24 recorded a horizontal displacement to the north (6.6 cm) and as an offset in the vertical (elevation of 7.4 cm) in SABI GPS station, located in the town of Sabinosa.

These deformation data "not perceptible to people," confirms a process of movement of magma beneath the island of El Hierro, and the source responsible for this deformation is in the central-western part of the island of El Hierro in conjunction with the recent seismic activity data. The movements recorded since June 24 are real and much more rapid than those seen last year 2011.

From January to early June 2012 significant shifts were occurring but minor GPS stations located in Valverde (VALVE, east), La Frontera (WNBF, shootings) in the Restinga (REST, southeast and elevation), in El Pinar (PINA, to the east) and Sabinosa (SABI, began to move slightly to the north).

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Update 02/07 13:09 UTC
- Another strong M3.6 earthquake just occurred at 12:51 UTC a little to the south of the lighthouse. The depth was measured at 18 km. This earthquake was (of course) felt in parts of the island.
- Seismicity started to increase approx. 20 minutes earlier

twitter:

teideano twitterde op dinsdag 03-07-2012 om 10:18:24 Bumpy ride at El Hierro tonight....up to 4,4 quakes, deformation now turning to deflation, making it even more weird. http://t.co/4lIeDVWi reageer retweet

quote:

Update 03/07 07:34 UTC
- Deformation statistics from the University of Nagoya in cooperation with Involcan are showing a strong decrease in Ultra Rapid values in the stations of Sabinosa, Pinar, Frontera and La Restinga. The numbers are showing a reverse effect than last nights earthquakes would have assumed.
- 71 earthquakes so far today, the strongest one being a M4.2 at 2:31
- hypocenter or focal depth range remains as it was, at 18 to 21 km in average. No shallow quakes anymore.
- activity has calmed a lot the last several hours, but earthquakes still occur at normal (whats normal ?) values of M+2
- the real number of volcanic earthquakes (including the weak ones) is far greater than the 71 mentioned above. How to see that ? Take a quick look at the CHIE graph and count the vertical out-swaying lines, and thats only a portion of it!

twitter:

teideano twitterde op dinsdag 03-07-2012 om 13:37:55 #volcano Evolution of seismicity and CO2 degassing at El Hierro. Seems that no gas, no eruption.... http://t.co/v6BcvZdz reageer retweet

twitter:

teideano twitterde op dinsdag 03-07-2012 om 16:35:22 @eruptionsblog @pabloj_gonzalez @Suw @rschott @Lumifg Recorded at El Hierro. IMPRESSIVE some hours ago. reageer retweet

DSCN3140

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Update 03/07 15:41 UTC very interesting Press Conference
IGN expects new strong earthquakes (up to M4.5-M4.6) for the next 7 days. This has been said at a press conference today. Pevolca does not have the intention the meet soon again if only these earthquakes are continuing as this is expected from now on. Pevolca asks the population of El Hierro to be ready for whatever eventual urgent communication which Pevolca may decide. The Grupo de Emergencias y Salvamento (GES) will be at El Hierro to reinforce the local groups, this to be prepared for whatever crisis to come.
María José Blanco (IGN) has said that an eventual eruption at the present seismic center (Las Calmas sea south of the lighthouse), where depths of the hypocenters are still measured at 20 km, can be excluded at this moment. She said that it also lasted quite some time last time before an eruption took place. The epicenters of the earthquakes had to migrate more than 20 km to the south before the magma found his way up. María José Blanco also said that an eruption on land can be excluded at the moment but that IGN follows up the situation very consciously as all the events are going much quicker than during last years eruption. (compiled by ER from a number of local press reports like Diario El Hierro)
- Already 123 earthquakes so far today

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INVOLCAN DISCLOSURE NOTICE: EVOLUTION GPS

After exhaustive analysis during the last hours of GPS data, Dr. Takeshi Sagiya, Professor of Nagoya University and Scientific Collaborator INVOLCAN, informed the group that the fall INVOLCAN observed in the GPS antenna of El Hierro, also been observed in other antennas located outside the island of Meridian, which coupled with little or no variation in the horizontal component leading to suggest that the data reflected by the GPS is affected by external effects, which could be related to tropospheric interference.

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Very important Update 03/07 – 23:55 UTC
A report from the GSC (Communication department of Canary Islands) has revealed that a helicopter survey unit has noticed a (small) jacuzzi and a white stain at coordinates 27º 4.573” N y 18º03.761” W in the Las Calmas sea approx. 180 meter out of the coast. The images which have been taken by the helicopter will now be analyzed by the IGN scientists. A new flight above the zone is planned for tomorrow.
- Nobody is sure at this moment whether this picture really reveals a new vent or shows just some currents. The similarity is at least what we used to see as colors and as water agitation during the 2011 eruption.
Jon Frimann (Icelandic volcanoes blog) writes an interesting comment which we share : Dike intrusions can happen with and without harmonic tremor. Dike intrusions with harmonic tremor happens mostly at places where conduct is well established. That is not the case now. So I would not trust any signs for harmonic tremors just yet. Harmonic tremor pulse might be seen few hours before the eruption starts. Given my experience and what I did see during Eyjafjallajökull volcano eruption in the year 2010. Given the amount of earthquake activity. I am assuming that some of the magma has reached less depth in the crust without making many earthquakes at present time. The reason for that is magma has easier time to make the rock soft at less depth. Soft rock means few to no earthquakes. How this plays out is all big question that currently nobody has an answer to at the moment. (Thanks to Ian Carson for informing us)
- Below another picture of the detected stain and small jacuzzi (the picture above in natural colors – in the picture below we have increased contrast and sunlight) (All pictures courtesy GES).
- Why all these maps below ? : we tried to use the coordinates as given in all the media, but we could not trace the location which coincides with the picture. Finally we decided to scan the southern coast and we tried to detect the trails along the coast. Once that being done, the google maps matched with the picture.

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[bron]
Curious? Coincidence? Continues the trend of the mayoreas "lashes" seismic, ie, events of magnitude greater, occur with the tide in their maximum or minimum ..... The gravitational pull on the magma seems to have any effect. The luninosidad lunar (white), continues to increase, the crescent moon for "lunatics".

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Update 04/07 – 09:37 UTC
- Joke will try to take a few some zoom pictures from the so called detected emission spot at noon.
- In the meantime, villagers are discussing the new emission location and what they can see on the pictures. Joke reports by SMS that the local fisherman do not believe in a new emission spot but are calling it a natural phenomena, ocean floor sea (sorry if this word does not exist in English as we have no other way to describe it). The phenomena is when the current are stirred over the ocean floor and are generating white foam waves at the surface.

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Update 04/07 – 11:58 UTC
- Joke reports that a GES Helicopter with divers on board has left Frontera a short-while ago. IGN and Pevolca are taking no risk this time and do all they can to clarify the situation.
- Also the IGN GPS stations are showing all a strong vertical uplift today.
- Earthquake epicenters are still concentrated to the south of the lighthouse area, no change in depths.

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Urgent Note Canarias7 the web:
13:39 URGENT Unofficial sources claim that the helicopter has flown on Wednesday Mar de Las Calmas has not detected and burjeo spot or area. On the night of Tuesday circulated an image CECOES suggesting the existence of volcanic activity, reports Rosa Rodriguez.
(Humberto)

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Update 05/07 – 07:20 UTC
- 104 earthquakes were listed by IGN yesterday
- 18 earthquakes so far today (the smallest number since the start of the swarm on June 24)
- NO harmonic tremor detected
- El Hierro has lived a calm night with a max. earthquake of Magnitude 2.6.
- NO change in hypocenter depths
- Almost NO change in the epicenter locations (west of the lighthouse) on the exception of 1 earthquake which occurred at a depth of 19.2 km (05:41 M1.8) on the beach a few hundred meter next the location were the GES heli had spotted some activity the day before yesterday (providing that the IGN data were accurate), but there is 99% chance that this is a coincidence.
- No new deformation numbers yet

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Update 05/07 12:04 UTC
- The number of earthquakes is quickly running up due to the latest swarm (update 10:04)
- A lot of the earthquakes are now happening in the 16 to 18 km layer, which, if prolonged can throw another light on this eruption and, more to the east could reach the lava tubes of the 2011 eruption. The next 12 hours will certainly give us a better view.
- deformation is down in most of the stations (IGN deformation stats), Involcan numbers are unsure (when will BOTH organizations finally show faint vertical lines in order to read the date of the markings!!)

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Update 06/07 14:28 UTC
- A new Pevolca reports confirms what we have written earlier today and yesterday. Additionally IGN has reported that also the islands of Tenerife and La Palma are moving horizontally. The El Hierro activity cannot be the only reason for this horizontal deformation. IGN also sampled air and water in the earthquake epicenter area and has found no abnormal values.

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Update 08/07 – 16:47 UTC
Richard Wilson, a geologist who is specialized in volcano seismicity and who is also the main contributor to our “(almost) daily Worldwide Volcano Acitivity report“, describes the El Hierro situation as follows:
Apparently a new round of seismicity at El Hierro (Spain) during the past 24-48 hours. This is typical of intrusive activity, but not eruptive activity. Typically eruptive seismicity is sustained and builds to a crescendo (and occurs at much shallower depth) before material is erupted at the surface. Also, the up-down-up pattern in GPS data also suggests lateral spreading and intrusion rather than an eruptive pattern, which would also build and build and build. Now, that being said, this is my interpretation, with very limited resources as far as instrumental data and does not preclude a sudden shallowing and intensification of seismicity and deformation (and,…finally eruption!). All instrumental signs of intrusive activity beneath a volcano must be watched vigilantly while they are in-progress in order to “catch” any of these “signs” of a forthcoming eruption. This has been what is so intriguing/challenging for me to watch volcanoes since I was in my 20s (I’m 52 years old now!).

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The INVOLCAN detected higher levels of emission of helium-3 in El Hierro one week before the recent seismic-strain pulse

Helium-3 is the main "fingerprint" that is available to detect subsurface magmatic activity in the

The Institute of Volcanic Islands (INVOLCAN) reports that higher levels of emission of helium-3 in El Hierro occurred on 16 June 2012, one week prior to this recent spike or pulse seismic-strain on the island of Meridian with more than 650 earthquakes above magnitude 2.5 in Richter scale and deformations that reflect shifts in the horizontal and vertical (elevation) of 8.5 and 8.2 cm, respectively, in one of the GPS stations INVOLCAN ( SABI and JULA) since last June 24, 2012.

Monitoring and measurement of emission levels of helium-3 is performed periodically at four observation points (groundwater) from El Hierro wells related to The Patterns, Frontera, San Simon and the gallery since it is impossible Tacorón existing technology at present for realizing a continuous record of this important parameter geochemical.

The highest levels of emission of helium-3 in El Hierro have been detected in the well of St. Simon last June 16, 2012 causing oil slicks to values ​​of 8.5 Ra, Ra being the ratio of isotopic ratios helio-3/helio -4 in the air. This record not only confirms the process of this recent rally magmatic or seismic-strain pulse in El Hierro but also could be detected one week before commencement.

These results have been obtained through close collaboration between scientists INVOLCAN and Geochemical Research Center, University of Tokyo, where are these analytical determinations using mass spectrometers with high resolution, given the lack of this type of specific instrumentation in Spain, as well as project MAKAVOL "Capacity Building of R & D + i + d to contribute to the reduction of Volcanic Risk in Macaronesia (MAC/3/C161)" which is being co- funded transnational cooperation program of the European Union Madeira-Canary-Azores (MAC 2007-2013).

The Institute of Volcanic Islands (INVOLCAN) or National Center for Volcanology is an institution demanded unanimously by the Senate (2005), Parliament of the Canary Islands (2006) and House of Representatives (2009) which calls for an urgent and pressing to the General Administration State and the Canary Islands and the Island Councils to the joint commitment of all human and technical resources that various intended for scientific management of volcanic risk in Spain (say Canaries, the only volcanically active region volcanic country risk) without incurring the loss of ownership of their resources and in order to ensure effective coordination and efficient to reduce volcanic risk in the Canaries. To date, the Cabildo Insular de Tenerife is the only administration that has been involved with this unanimous decision of the legislative chambers in this country.

From INVOLCAN is recalled that the official information on the level of alert to adverse volcanological phenomena which is output from the communications of the Special Plan of Civil Protection and Emergency Response for Volcanic Risk in the Canary Islands (PEVOLCA) .