Vulkaanuitbarsting bij Canarische Eilanden #5

quote:

Recordaantal aardbevingen op Canarisch eiland

Nog nooit eerder werden er zoveel aardbevingen achter elkaar geregistreerd op het kleine vulkanische eilandje El Hierro, het kleinste van de Canarische Eilanden. De reeks van maar liefst 720 bevinkjes heeft de overheid van deze eilandengroep voor de kust van West Afrika ertoe doen besluiten om voor het eerst in de geschiedenis een vergadering bijeen te roepen van het Stuurcomité van Vulkanische Monitoring. Dit comité werd opgericht om specifieke plannen te realiseren, die de burgerbevolking dienen te beschermen en noodplannen voor vulkanische risico’s moeten ontwikkelen. Inmiddels wordt gesproken over een ‘significante dreiging van seismische activiteit’.

Het Nationaal Geografisch Instituut (IGN) en het Volcanologische Instituut van de Canarische eilanden blijft nauwlettend de aardbevingen in de gaten houden, waarvan de kracht van de bevingen (elke dag!) ligt tussen de 1 en 3 op de Richterschaal. De meerderheid van de bevingen vindt plaats tussen 5 en 15 km diepte.

Volgens de autoriteiten betekent deze seismische activiteit nog niet direct dat een grotere, significante aardbeving zal plaatsvinden. Het merendeel van de bevingen die zijn geregistreerd, vonden plaats in het Noord Westen van het 280 vierkante kilometer kleine eilandje, bij het plaatsje El Golfo (zie foto hieronder). Een aardbeving op deze plaats zorgde er zo’n 50.000 jaar geleden voor, dat er een enorme landverschuiving plaatsvond, waarbij de helft van de vulkaan in zee gleed. Hierdoor ontstond een ca. 100 meter hoge tsunami die naar de overzijde van de Atlantische oceaan zou zijn gegleden. Schuin tegenover dit eilandje, in het verlengde van de resterende halve kratermond, ligt het Noord Amerikaanse continent..

quote:

El Hierro Earthquake Swarm Enters Third Week
The intensity of earthquakes recorded on the smallest of the Canary Islands, El Hierro, has increased slightly during the last 24 hours. However, the total number of earthquakes recorded daily has lessened since the earthquake swarm initially began on 17 July.

The total number of tremors recorded during the past two weeks has now exceeded 1,050, according to the Instituto Geografico Nacional (IGN).

The majority of the earth tremors ranged between 1-2 magnitude, but during the past 24 hours there have been least five tremors measuring in excess of 2.0 magnitude on the Richter Scale. A 2.4 magnitude earthquake was recorded at 4:56 p.m. local time on Sunday (31 July 2011).

Approximately 50 earth tremors were recorded on Sunday, according to local earthquake monitoring agency Actualidad Volcánica de Canarias (AVCAN). The number is slightly down on the number of tremors recorded on Saturday and significantly less than the 195 earthquakes recorded on 22 July.

quote:

The vast majority of the tremors have been recorded in the northwest of the 278.5-square-kilometre island at El Golfo, the location of a massive landslide that created a 100-metre high tsunami almost 50,000 years ago.

The earthquake swarm, prompted the Canary Islands Government to convene the first ever meeting on 22 July of the Steering Committee and Volcanic Monitoring, reflected in the Specific Plan Protection Civil and Emergency for Volcanic Risk, given what it described “the significant increase in seismic activity”. The Committee met again on Friday 29 July to discuss the low magnitude seismic activity. It reported that it had stepped up its seismic monitoring operations to identify the source of the earthquakes.

Following an evaluation of seismic and volcanological information gathered by the IGN and volcanological Institute of the Canary Islands, the Committee agreed to activate “monitoring and surveillance mechanisms necessary to coordinate the actions of civilian self-protection and information to people listed in the Plan” (translated from Spanish press release). It remains unclear, however, if the unprecedented seismic activitiy on El Hierro is a precursor to a possible future increase in earthquake or volcanic activity.

Earthquake swarms are events where a local area experiences sequences of many earthquakes striking in a relatively short period of time. The length of time used to define the swarm itself varies, but the United States Geological Survey (USGS) points out that an event may last for days, weeks, or months.

El Hierro’s Volcanic/Seismic Past

El Hierro is situated in the most southwestern extreme of the Canaries. The island was formed after three successive eruptions, and consequent accumulations, the island emerged from the ocean as an imposing triangular pyramid crowned by a volcano more than 2,000 metres high.

The volcanic activity, principally at the convergence of the three ridges, resulted in the continual expansion of the island. A mere 50,000 years ago, as a result of seismic tremors which produced massive landslides, a giant piece of the island cracked off, crashed down into the ocean and scattered along the seabed. This landslide of more than 300km3 gave rise to the impressive amphitheatre of the El Golfo valley and at the same time caused a tsunami that most likely rose over 100 metres high and probably reached as far as the American coast.

quote:

Op maandag 17 september 2012 13:16 schreef bwt het volgende:

twitter:

teideano twitterde op maandag 17-09-2012 om 12:04:41 #volcano New GPS data from El Hierro. Inflation continues with a high rate. 2.81 cm up in PINA in just 3 days... http://t.co/d67M7KpP reageer retweet

quote:

Op maandag 17 september 2012 14:05 schreef bwt het volgende:

twitter:

teideano twitterde op maandag 17-09-2012 om 13:27:20 #volcano New GPS data from El Hierro. Inflation continues with a high rate. 3.13 cm up in REST in just 3 days... http://t.co/Vu7CeU4H reageer retweet

quote:

Op maandag 17 september 2012 14:08 schreef bwt het volgende:

twitter:

teideano twitterde op maandag 17-09-2012 om 13:45:31 #photography Anciente lava flow at El Hierro, Canary Islands, actually suffering a big seismic swarm #volcano http://t.co/XKL1xSte reageer retweet

twitter:

teideano twitterde op maandag 17-09-2012 om 16:22:09 #volcano Some parts of El Hierro island have uplifted more than 15 cm since July 2011 and still inflating, faster than Santorini! #amazing reageer retweet

quote:

Update 17/09 – 15:36 UTC
- Is the crust starting to show cracks ? Why are we writing this ? If IGN data are correct, we have noticed a number of shallower earthquakes the last couple of hours. Nothing to be scared off, but this is definitely a change in patterns versus earlier today and the 2 preceding days. From 12:27 until 14:39 (less than 3 hours) we have noticed 6 under 20 km earthquakes on a total of 17.
The shallowest being a 13 km, but also a 15 km and a couple of 18 km. Is the magma the cause ? IGN would probably know it but mostly keeps his information for international science conferences a couple of months later!
The shallowest one was recorded below the Sabinosa area, the area where the other 10 km were recorded last week.
- 71 earthquakes so far

Update 17/09 – 17:05 UTC
- 84 earthquakes until 16:11 UTC
- Another 2 shallow quakes at 10 and 11 km , both in the El Golfo, Sabinosa area. The phenomena described in the last update is being confirmed with these quakes. The Sabinosa – El Golfo area has become active again. We are however unsure whether IGN has deliberately omitted the quakes in this area when the strong swarm started. If this was not the case (what we should find very normal) then we can speak of a changing pattern. The following hours will give a better idea of the situation

Update 17/09 – 20:01 UTC
- 95 earthquakes, all the recent ones at 20 km or deeper

quote:

Update 18/09 – 11:37 UTC
Flat lines again in El Hierro – The swarm has suddenly stopped which means that we are still at 10 earthquakes since midnight
- nobody will be able to predict what will happen now. The swarm started after increasing weak seismicity in the El Golfo area . The graph still shows some micro-seismicity, but this sudden halt comes also as a surprise to us.

Update 18/09 – 08:01 UTC
- Only 10 earthquakes so far today. The swarm was very short-lived this time.
- Only the last one at 06:03 was shallower than the rest (11 km) – epicenter near Sabinosa
- Except for the 11 km earthquakes all other epicenters are located in the old crater area (like the images below)
- It is clear that there are 2 magma feeders at work , a weak one below the El Golfo – Sabinosa area and a main feeder who originates below the island and is searching for an exit. During the first eruption it succeeded in finding a system to reach the Las Calmas sea. During the second swarm, the western part of the island showed to be too strong to overcome. The current third swarm does not succeed to get to upper layers (very fortunate for the population on the island, and is subsiding already now
- Deformations
Restinga : slight uplift of approx. 0.5 cm
Pinar and Frontera : slight uplift and pressure to the North (both a couple of mm)
Deformations are confirming the earthquake trend, less inflation today than yesterday

twitter:

teideano twitterde op woensdag 19-09-2012 om 10:46:25 #volcano More GPS data. REST station inflating at quick pace. 4,81 cm in 6 days. #earthqueake number up to 16185... http://t.co/bAmtkNIa reageer retweet

quote:

2012-09-19 13:22
- Apparently nothing is happening at El Hierro (at least no more earthquakes)
- seismicity is back to pre-swarm values

2012-09-19 10:16
- 23 earthquakes in total yesterday, the last one being a M1.7 at 14 km
- 7 earthquakes so far this morning, 2 at a depth of 10 km (El Golfo and Las Calmas), the rest at approx. 20 km deep in the old crater area and El Pinar area
- GPS deformations :
Frontera : a few mm further inflated, a couple of mm to the North-East
Pinar : stabilised in horizontal and vertical axis (normal as with the decrease in number and strength of the earthquakes, the pressure below the center of the island has strongly subsided)
Restinga : comes as a surprise – Restinga is pushed a few mm to the east and has a further strong inflation of nearly 1.5 cm Ultra Rapid preliminary results)

twitter:

teideano twitterde op vrijdag 05-10-2012 om 13:34:05 @eruptionsblog @rschott @jonfr500 LP´s at La Palma? mmmmm...will upload spectra in a second... http://t.co/j9ZpZiSH reageer retweet

twitter:

teideano twitterde op vrijdag 05-10-2012 om 13:34:48 @eruptionsblog @rschott @jonfr500 so my firends...what do you think ´bout that? http://t.co/WQvtilUe reageer retweet

quote:

2012-11-23 15:24 UTC
- We continue following eventual events on the island, but the last couple of weeks all activity calmed down. The last 5 days, we only could find 2 volcanic earthquakes below the island

quote:

2012-11-26 17:56 UTC
- NO activity whatsoever since the last 2 days - this update especially for Suzanne who thinks that we are not following up El Hierro anymore )

quote:

2012-12-10 23:58 UTC
- Rather lot of activity today (thank you ER reader Gos for informing us). In only 35 minutes various vcery weak volcanic earthquakes below the center of the island gradually shifting to the south. Depths like the latest swarm. The next 48 hours will indicate whether this was a unique event or wether a new episode will start.

twitter:

pabloj_gonzalez twitterde op dinsdag 01-01-2013 om 03:17:18 2012 says goodbye with a small swarm of volcano-tectonic earthquakes at N-NW coast of El Hierro Island http://t.co/iUuMtSJ7 reageer retweet

quote:

IGN seismic data

1183877 01/01/2013 07:05:57 27.8127 -18.0045 17 2.3 mbLg N FRONTERA.IHI [+]
1183875 01/01/2013 06:21:35 27.8081 -17.9918 17 2.2 mbLg N FRONTERA.IHI [+]
1183873 01/01/2013 06:06:12 27.8178 -18.0247 18 1.8 mbLg NW FRONTERA.IHI [+]
1183849 01/01/2013 05:54:26 27.7623 -18.0231 18 1.7 mbLg W FRONTERA.IHI [+]
1183847 01/01/2013 05:46:06 27.8013 -18.0238 17 1.8 mbLg NW FRONTERA.IHI [+]
1183846 01/01/2013 05:44:30 27.7876 -18.0092 18 1.5 mbLg NW FRONTERA.IHI [+]
1183844 01/01/2013 05:32:05 27.7844 -17.9904 20 2.0 mbLg NE FRONTERA.IHI [+]
1183843 01/01/2013 05:15:54 27.8384 -18.0165 17 1.5 mbLg N FRONTERA.IHI [+]
1183756 01/01/2013 04:35:05 27.8028 -17.9859 18 2.4 mbLg N FRONTERA.IHI [+]
1183742 01/01/2013 02:55:09 27.7419 -18.0030 19 1.8 mbLg SW FRONTERA.IHI [+]
1183741 01/01/2013 01:48:49 27.8115 -18.0092 18 1.9 mbLg N FRONTERA.IHI [+]
1183730 01/01/2013 00:19:47 27.8345 -17.9992 17 2.1 mbLg N FRONTERA.IHI [+]
1183721 31/12/2012 23:42:07 27.8011 -17.9888 20 2.1 mbLg N FRONTERA.IHI [+]
1183711 31/12/2012 21:52:16 27.8496 -18.0057 17 2.2 mbLg NW VALVERDE.IHI [+]
1183710 31/12/2012 21:32:07 27.8065 -17.9959 17 1.7 mbLg N FRONTERA.IHI [+]
1183709 31/12/2012 21:20:21 27.8159 -18.0044 18 2.0 mbLg N FRONTERA.IHI [+]
1183705 31/12/2012 20:45:40 27.8214 -18.0122 16 2.4 mbLg N FRONTERA.IHI [+]
1183702 31/12/2012 20:25:07 27.8174 -18.0170 19 2.2 mbLg NW FRONTERA.IHI [+]
1183701 31/12/2012 20:12:43 27.9903 -18.0254 18 2.4 mbLg NW VALVERDE.IHI [+]
1183699 31/12/2012 19:59:50 27.8293 -18.0061 18 2.3 mbLg N FRONTERA.IHI [+]
1183697 31/12/2012 19:38:19 27.8181 -18.0052 17 1.9 mbLg N FRONTERA.IHI [+]
1183698 31/12/2012 19:29:12 27.8334 -18.0049 17 2.1 mbLg N FRONTERA.IHI [+]
1183696 31/12/2012 19:13:57 27.7915 -18.0000 18 2.3 mbLg N FRONTERA.IHI [+]
1183700 31/12/2012 19:08:36 27.8059 -17.9978 18 2.2 mbLg N FRONTERA.IHI [+]
1183694 31/12/2012 18:57:36 27.8150 -18.0037 19 2.2 mbLg N FRONTERA.IHI [+]
1183693 31/12/2012 18:52:52 27.8325 -18.0163 16 2.2 mbLg N FRONTERA.IHI [+]
1183691 31/12/2012 18:38:30 27.8071 -18.0119 17 1.7 mbLg N FRONTERA.IHI [+]
1183688 31/12/2012 18:32:33 27.7924 -17.9998 19 2.0 mbLg N FRONTERA.IHI [+]
1183683 31/12/2012 18:17:28 27.8169 -18.0256 17 2.3 mbLg NW FRONTERA.IHI [+]
1183685 31/12/2012 18:07:05 27.8436 -18.0277 17 2.2 mbLg NW FRONTERA.IHI [+]
1183684 31/12/2012 18:03:10 27.8287 -18.0119 18 2.2 mbLg N FRONTERA.IHI [+]
1183682 31/12/2012 17:49:24 27.8098 -18.0194 20 2.2 mbLg NW FRONTERA.IHI [+]
1183673 31/12/2012 17:00:52 27.8053 -18.0293 18 2.4 mbLg NW FRONTERA.IHI [+]
1183680 31/12/2012 16:59:33 27.8032 -18.0196 19 1.8 mbLg NW FRONTERA.IHI [+]
1183672 31/12/2012 16:54:54 27.8598 -18.0074 16 2.1 mbLg NW VALVERDE.IHI [+]
1183670 31/12/2012 16:53:08 27.8351 -18.0104 17 2.3 mbLg N FRONTERA.IHI [+]
1183669 31/12/2012 16:46:19 27.8089 -18.0024 19 1.8 mbLg N FRONTERA.IHI [+]
1183666 31/12/2012 16:42:46 27.8269 -18.0148 16 2.0 mbLg N FRONTERA.IHI [+]
1183646 31/12/2012 16:42:27 27.8364 -18.0133 16 2.0 mbLg N FRONTERA.IHI [+]
1183645 31/12/2012 16:32:37 27.8626 -18.0278 14 2.0 mbLg NW FRONTERA.IHI [+]
1183642 31/12/2012 16:25:07 27.8363 -18.0082 17 1.9 mbLg N FRONTERA.IHI [+]
1183640 31/12/2012 16:17:12 27.8382 -18.0139 18 2.1 mbLg N FRONTERA.IHI [+]
1183638 31/12/2012 16:09:40 27.7984 -18.0057 17 1.8 mbLg N FRONTERA.IHI [+]
1183636 31/12/2012 16:07:02 27.7750 -18.0019 18 2.0 mbLg N FRONTERA.IHI [+]
1183598 31/12/2012 16:01:38 27.8143 -18.0046 18 2.5 mbLg N FRONTERA.IHI [+]
1183619 31/12/2012 15:54:01 27.8258 -18.0058 18 2.4 mbLg N FRONTERA.IHI [+]
1183618 31/12/2012 15:43:02 27.8462 -18.0095 18 2.1 mbLg N FRONTERA.IHI [+]
1183599 31/12/2012 15:17:24 27.8233 -18.0257 20 1.9 mbLg NW FRONTERA.IHI [+]
1183592 31/12/2012 15:17:24 27.8333 -18.0279 18 2.0 mbLg NW FRONTERA.IHI [+]
1183583 31/12/2012 14:40:56 27.8155 -18.0191 18 1.9 mbLg NW FRONTERA.IHI [+]
1183582 31/12/2012 14:38:48 27.6622 -17.9945 18 2.3 mbLg SW EL PINAR.IHI [+]
1183580 31/12/2012 14:28:12 27.7609 -18.0405 18 2.0 mbLg W FRONTERA.IHI [+]
1183579 31/12/2012 14:26:08 27.7855 -18.0015 18 1.7 mbLg N FRONTERA.IHI [+]
1183577 31/12/2012 14:25:29 27.8084 -18.0166 18 1.9 mbLg NW FRONTERA.IHI [+]
1183575 31/12/2012 14:21:12 27.8225 -18.0113 18 1.9 mbLg N FRONTERA.IHI [+]
1183571 31/12/2012 14:15:01 27.7885 -18.0119 17 2.2 mbLg NW FRONTERA.IHI [+]
1183569 31/12/2012 14:14:34 27.8229 -18.0102 18 2.2 mbLg N FRONTERA.IHI [+]
1183573 31/12/2012 14:13:19 27.8363 -18.0068 21 2.0 mbLg N FRONTERA.IHI [+]
1183581 31/12/2012 14:08:14 27.7708 -18.0021 20 1.8 mbLg N FRONTERA.IHI [+]
1183578 31/12/2012 14:07:37 27.7702 -18.0197 18 2.0 mbLg NW FRONTERA.IHI [+]
1183576 31/12/2012 14:02:36 27.7799 -18.0156 18 1.7 mbLg NW FRONTERA.IHI [+]
1183574 31/12/2012 13:53:03 27.8265 -18.0234 15 1.8 mbLg NW FRONTERA.IHI [+]
1183572 31/12/2012 13:13:29 27.8296 -18.0315 18 1.6 mbLg NW FRONTERA.IHI [+]
1183570 31/12/2012 13:10:51 27.8099 -18.0203 17 2.3 mbLg NW FRONTERA.IHI [+]
1183567 31/12/2012 13:08:19 27.8001 -18.0154 17 2.0 mbLg NW FRONTERA.IHI [+]
1183559 31/12/2012 11:22:10 27.8180 -18.0563 18 1.7 mbLg NW FRONTERA.IHI [+]
1183558 31/12/2012 11:09:28 27.7798 -18.0343 21 1.5 mbLg NW FRONTERA.IHI [+]
1183557 31/12/2012 10:39:26 27.7785 -18.0423 19 2.0 mbLg NW FRONTERA.IHI [+]
1183556 31/12/2012 10:38:44 27.7626 -18.0363 20 1.9 mbLg W FRONTERA.IHI [+]

quote:

IGN
1184236 02/01/2013 08:47:55 27.8005 -17.9967 19 2.3 mbLg N FRONTERA.IHI [+]
1184234 02/01/2013 08:30:47 27.8016 -17.9975 1.5 mbLg N FRONTERA.IHI [+]
1184233 02/01/2013 08:24:14 27.8053 -18.0042 24 2.1 mbLg N FRONTERA.IHI [+]
1184231 02/01/2013 07:53:11 27.7883 -17.9953 21 1.7 mbLg N FRONTERA.IHI [+]
1184225 02/01/2013 07:52:47 27.7784 -17.9861 21 2.3 mbLg NE FRONTERA.IHI [+]
1184219 02/01/2013 06:46:59 27.8208 -17.9985 20 1.9 mbLg N FRONTERA.IHI [+]
1184214 02/01/2013 06:18:39 27.8230 -18.0167 20 1.6 mbLg NW FRONTERA.IHI [+]
1184213 02/01/2013 06:09:56 27.8062 -17.9901 21 1.6 mbLg N FRONTERA.IHI [+]
1184209 02/01/2013 05:15:27 27.7912 -17.9984 18 2.3 mbLg N FRONTERA.IHI [+]
1184178 02/01/2013 01:42:14 27.8115 -18.0004 22 2.2 mbLg N FRONTERA.IHI [+]
1184177 02/01/2013 01:30:01 27.8304 -18.0031 17 2.2 mbLg N FRONTERA.IHI [+]
1184170 01/01/2013 23:47:33 27.8508 -18.0072 18 2.4 mbLg NW VALVERDE.IHI [+]
1184123 01/01/2013 21:15:23 27.8186 -18.0003 17 2.6 mbLg N FRONTERA.IHI [+]
1184118 01/01/2013 20:36:20 27.8483 -18.0032 18 2.4 mbLg NW VALVERDE.IHI [+]
1184097 01/01/2013 20:24:04 27.8010 -17.9855 20 1.8 mbLg NE FRONTERA.IHI [+]
1184091 01/01/2013 20:07:15 27.8215 -17.9977 19 1.8 mbLg N FRONTERA.IHI [+]
1184087 01/01/2013 19:21:27 27.8649 -18.0279 2.3 mbLg NW FRONTERA.IHI [+]
1184085 01/01/2013 19:14:18 27.7991 -17.9987 22 1.9 mbLg N FRONTERA.IHI [+]
1184078 01/01/2013 18:51:08 27.8251 -17.9968 21 2.5 mbLg N FRONTERA.IHI [+]
1184071 01/01/2013 17:33:48 27.7849 -17.9939 18 2.3 mbLg N FRONTERA.IHI [+]
1184060 01/01/2013 17:16:14 27.8527 -18.0282 18 2.1 mbLg NW FRONTERA.IHI [+]
1184047 01/01/2013 15:42:11 27.8519 -18.0286 1.9 mbLg NW FRONTERA.IHI [+]
1184000 01/01/2013 14:08:55 27.8019 -18.0084 20 1.7 mbLg N FRONTERA.IHI [+]
1183942 01/01/2013 13:33:52 27.8017 -17.9884 18 1.9 mbLg N FRONTERA.IHI [+]
1183950 01/01/2013 13:21:51 27.8208 -18.0065 17 2.2 mbLg N FRONTERA.IHI [+]
1183939 01/01/2013 13:02:44 27.8186 -18.0124 20 2.3 mbLg N FRONTERA.IHI [+]
1183935 01/01/2013 12:48:46 27.7854 -17.9926 16 1.7 mbLg N FRONTERA.IHI [+]
1183928 01/01/2013 12:27:48 27.8001 -17.9970 16 2.5 mbLg N FRONTERA.IHI [+]

quote:

2013-01-02 09:29 UTC
- Activity continues in the somewhat deeper 17 to 21 km layer in the same Las Puntas Frontera area. As the HT remains almost flat compared to the strong amplitude yesterday afternoon, it looks that the magma has been stopped at the current stage. Only earthquakes are generated. Next 24 hours will give us a clue whether the magma will remain locked in or will find a way to another point.
- The only point to the south of the swarm is a 10.6 km depth earthquake which you can see in the list. We do not think that there is a relation in between the swarm and the isolated 10.6 km quake.

quote:

1184275 02/01/2013 12:48:57 27.7911 -17.9997 19 1.9 mbLg N FRONTERA.IHI [+]
1184245 02/01/2013 10:58:15 27.8219 -18.0081 17 2.1 mbLg N FRONTERA.IHI [+]
1184243 02/01/2013 09:55:42 27.8079 -17.9956 21 1.8 mbLg N FRONTERA.IHI [+]
1184238 02/01/2013 09:04:57 27.8369 -18.0105 18 2.2 mbLg N FRONTERA.IHI [+]
1184240 02/01/2013 08:48:57 27.7985 -17.9924 19 2.4 mbLg N FRONTERA.IHI [+]
1184237 02/01/2013 08:48:20 27.8027 -17.9997 19 2.4 mbLg N FRONTERA.IHI [+]

quote:

1184346 02/01/2013 21:45:41 27.8050 -17.9815 18 1.7 mbLg NE FRONTERA.IHI [+]
1184342 02/01/2013 21:45:19 27.8268 -17.9827 20 1.7 mbLg NW VALVERDE.IHI [+]
1184314 02/01/2013 21:06:55 27.8379 -17.9896 17 1.6 mbLg NW VALVERDE.IHI [+]

quote:

2013-01-03 14:06 UTC
- The process has ended again. As we changed from server, and the last post of yesterday has not been copied, please find below all the earthquakes since yesterday 12:48 UTC. You will see that today is an earthquake desert again

quote:

2013-01-05 11:35 UTC
- For all those among you looking at the graphs. Be sure, nothing happened at El Hierro. The strong amplitude is the M7.5 Alaska earthquake !
Check our report by clicking on the link below
Potential Tsunami from M7.7 earthquake off Alaska – ALL WARNINGS and ADVISORIES are now CANCELED

quote:

Bron
When an undersea eruption began off the volcanic island of El Hierro in 2011, research ships showed up in the Canary Islands right away to study it. One thing they found in the first days was floating rocks of a peculiar kind, like a geological frybread or fritter. Now a paper in the open-access journal Solid Earth has given them a more scientific-sounding name: xeno-pumice.

twitter:

eruptionsblog twitterde op donderdag 10-01-2013 om 00:22:43 Wow, this is one of the weirdest and coolest things - the xenopumice of El Hierro. (from @aboutgeology): http://t.co/iiXvtRvv reageer retweet

twitter:

eruptionsblog twitterde op donderdag 10-01-2013 om 00:23:58 Soft sediment and magma can interact, but usually you get peperite (http://t.co/3HGzafwg). Sounds like El Hierro had high magma/sed. ratio reageer retweet

twitter:

eruptionsblog twitterde op donderdag 10-01-2013 om 00:26:45 More xenopumice analysis from @GeoEvelyn as well: http://t.co/MSaKSN1Q (via @lockwooddewitt) reageer retweet

quote:

Op woensdag 25 januari 2012 18:52 schreef Tokamak het volgende:

[..]

Het water is (althans een aantal dagen geleden) nauwelijks warmer op de plek waar het wit is. Dat zijn voornamelijk gasbubbels die opstijgen. Soms raken die gasbubbels gevangen in de lava, en in een zeldzaam geval ontstaan er zo hete brokken, gevuld met gas, die naar de oppervlakte stijgen. Die veroorzaken de rookpluimen die je soms ziet. Als er hele rookwolken ontstaan, net zoals gister het geval was, dan zijn dat heel veel van die brokken.

Hier een illustratie wat er gebeurt, En als je goed oplet tijdens de activiteit, zie je ook dat die brokken/de rook zich niet in de 'jacuzzi' bevinden, maar er net achter

quote:

2013-01-13 19:04 UTC
- More action than usual the last couple of days (but far from a new episode of course)

quote:

2013-01-25 22:57 UTC
- 3 volcanic earthquakes today.
- IGN has confirmed that the stain earlier this week was because of degassing of the volcano edifice. This phenomenon can go on for some more weeks.
- The President of the Canary Islands, Mr. Ricardo Melchior, has made a statement that Involcan will get the necessary 240.000 euro to continue their work.

quote:

2013-01-31 19:03 UTC
- A strong (for El Hierro at least) earthquake occurred at 16:27 UTC at a depth of 15 km.
No other earthquakes have been listed by IGN today, but if we watch the HT graph, we see some real changes happening. We are of course curious what the next hours will happen. The HT line is seriously thicker than this morning and the amplitude increased a little before the strong earthquake. Location of the epicenter here. The epicenter of this quake (more or less at the new volcano buildup) makes this episode even more interesting.

quote:

2013-02-01 08:58 UTC
- Superficially it looks like yesterdays activity ended, but if you look carefully at the CHIE graph, many micro events are still occurring.
- IGN has not listed (at the time of writing) the 02:33 earthquake yet. This was a local earthquake as no other event so strong happened elsewhere in the world.

twitter:

teideano twitterde op zaterdag 02-02-2013 om 15:28:06 And the story goes on and on at El Hierro.....Up/Down shown here.... #volcano #geology http://t.co/ktUSjfS6 reageer retweet

twitter:

sandatlas twitterde op maandag 04-02-2013 om 15:05:00 Pictures of volcanic bombs from the Canaries http://t.co/7LVkIxuz reageer retweet

twitter:

teideano twitterde op dinsdag 05-02-2013 om 14:56:22 https://t.co/Ej6OpNsW A new #eruption at El Hierro submarine #volcano? New insights from INVOLCAN, sorry, but is in spanish.... reageer retweet

quote:

Paul J. Gonzalez @ pabloj_gonzalez
. @ teideano ? eruption at 60-90 feet deep with no visible effects?
Details
4h davidcalvo @ teideano
@ pabloj_gonzalez that's the same question I ask myself ..... gas emissions? To call it?
Details
4h Paul J. Gonzalez @ pabloj_gonzalez
@ teideano Strong evidence of gaseous emissions, but the NS lineation detected (no rift W Control). Remember the plumes of IOE to N?
Details
4h davidcalvo @ teideano
@ pabloj_gonzalez if those limits seemed linked to the sliding of the Gulf, there seemed to be more control structural aspects.
Details

quote:

Involcan confirms a new undersea volcanic activity occurred at El Hierro in 2012

The submarine volcanic activity occurred near the west coast of the island and was associated with seismic-deformational crisis in El Hierro recorded June 25 to July 9, 2012


Tenerife-05.02.2013. The results of a collaboration between scientists at the Volcanological Institute of the Canary Islands (Involcan), the Geological Survey of Spain (IGME) and the Hydrographic Institute of the Navy (IHHM) confirm that at the end of June 2012 there was a New undersea volcanic activity was not perceived and which has not been recorded so far.
The research of marine geophysics conducted by researchers and IHHM IGME aboard the oceanographic research vessel Hesperides, recorded last June 27, 2012 several emission plumes of volcanic material less than 2 miles along the coast west of El Hierro (volcano Lomo Black-Faro The Orchilla) at depths between 64 and 88 meters. These plumes were recorded through acoustic images which enabled the research team includes scientists from IGME, Involcan IHHM and identify the existence of volcanic material emitted from the seafloor and that came to form plumes that reached 48 meters .
This new submarine volcanic process was preceded by a series of warning signs. In HIE02 geochemical station, that has Involcan the western part of the island of Meridian, was an increase of radon activity from late April to early June 2012 getting itself to peak values 10 times higher than normal values for this season. Monitoring and measurement of isotopic ratios 3He/4He in helium dissolved in groundwater San Simón hole, located in the eastern part of the island, accused the highest emission of helium-3 recorded since the start of the recovery magma of El Hierro. Besides these geochemical precursory signals recorded a sharp increase of the seismic energy released and the number of earthquakes of magnitude above 2.5 as of June 25, 2012. Alongside the GPS Network stations Canaria (Involcan-GRAFCAN Nagoya University) measured very significant shifts in both the vertical and the horizontal, accusing elevations of about 3 centimeters during the first two days of the crisis of seismic-strain June 25 to July 9, 2012.
The cooperation between scientists from the aforementioned institutions has identified a new undersea volcanic activity on El Hierro in 2012 of great scientific importance to assess the current magmatic reactivation process under the Meridian Island, and for the purposes of prevention, but fortunately it had no impact on the security of the population. The results of this work have been accepted scientific cooperation to be presented at the next international conference of the European Geosciences Union to be held in Vienna (Austria) from 7 to 12 April 2013.

Caption: Location of various emission plumes of volcanic material within two miles along the west coast of El Hierro recorded last June 27, 2012

quote:

2013-02-05 11:58 UTC
- Only few earthquakes, but something is currently starting, however we do not know whether it will continue the following hours. A lot of micro-seismicity since a couple of hours. (Thanks to our readers Tam and Leona who have been informing us of what was happening)

quote:

Op dinsdag 5 februari 2013 21:05 schreef Frutsel het volgende:
allemaal voorbode voor de eruptie van de supervulkaan bij napels

Anyway...tof dat je het nog altijd volgt en update

quote:

2013-02-07 09:50 UTC
- We were disturbed in the middle of writing an update for El Hierro when the Santa Cruz Island Mega-Quake hit.
- 3 Spanish organisations (Involcan, IGME and IHHM) will publish a scientific paper at a conference in April claiming that they have found another eruption location at the south-west part of the island. The eruption was detected by the oceanographic vessel Hesperides during the fierce seismic period of the end of June / beginning July. Sonar images show, what the researchers are claiming to be volcanic plumes, eruption material released at less than 2 NM from the coast and at depths of 64 to 88 meter. The released material was thrown up to a depth of 48 meter. Involcan sees a confirmation in their findings from the strong deformation at the time and from some increased chemical values. (ER:Involcan omits one of the most important elements here : the depth of the hypocenters! There were almost no volcanic earthquakes at a this shallow depth, neither was there any evolution in shallower depth – read our extensive reporting at the time here))
Involcan got its moment of glory explaining this “new” event on all Spanish TV stations. Big news in Spain.
- For ER the big news is that these scientific organizations did wait 6 months to disclose these findings. These acoustic images were almost IMMEDIATELY available at the time the Hesperides made his research trip. NO WORD TO THE PUBLIC at that time. Since the beginning of the El Hierro eruption process, our readers have the feeling that the Spanish research institutions are not publishing all they know. The current disclosure is another proof of all this. We do not think Involcan is to be blamed for what happened (or did they wait to present their scientific paper on the conference), but other organizations surely are.
Read also the article in Diario El Hierro about this 2th eruption spot.

quote:

Op donderdag 7 februari 2013 14:26 schreef Adfundum het volgende:

[..]

Dat bericht gaat toch over het eiland Santa Cruz bij de Solomon eilanden, niet over de stad Santa Cruz op Tenerife.

twitter:

teideano twitterde op vrijdag 08-02-2013 om 00:49:40 25 earthquakes at El Hierro in the last 15 days. 16710 since everything started back in July 2011. #eruption #volcano #geology reageer retweet

twitter:

canariesnews twitterde op maandag 04-03-2013 om 18:40:41 Waves of up to 6.5m. expected this evening on islands of La Palma, El Hierro, Tenerife, Lanzarote and Fuerteventura. http://t.co/szFO2sFZxY reageer retweet

quote:

1197462 18/03/2013 06:01:04 27.7287 -18.0276 12 2.0 mbLg SW FRONTERA.IHI [+]
1197460 18/03/2013 00:00:15 27.7330 -18.0366 15 2.0 mbLg SW FRONTERA.IHI [+]
1197450 17/03/2013 23:48:10 27.7514 -18.0196 13 2.0 mbLg W FRONTERA.IHI [+]
1197457 17/03/2013 23:45:40 27.7106 -18.0344 13 1.8 mbLg W EL PINAR.IHI [+]
1197456 17/03/2013 23:45:17 27.6520 -18.0951 14 2.0 mbLg SW EL PINAR.IHI [+]

twitter:

teideano twitterde op maandag 18-03-2013 om 16:16:33 @eruptionsblog @Suw @rschott @pabloj_gonzalez @etnaboris El Hierro right now. Do we go again? http://t.co/lERMNzQnWI reageer retweet

twitter:

teideano twitterde op maandag 18-03-2013 om 16:22:14 Last hour at El Hierro #volcano It looks like a new unrest..... http://t.co/HGEqpUAdxa reageer retweet

twitter:

teideano twitterde op maandag 18-03-2013 om 16:48:02 Ongoig swarm at El Hierro #volcano The pic displays last 45 minutes. such an energetic pulse..... http://t.co/COZhYgfzfy reageer retweet

quote:

1197639 18/03/2013 17:39:53 27.7674 -18.1259 18 3.1 4 W FRONTERA.IHI

twitter:

teideano twitterde op dinsdag 19-03-2013 om 10:51:13 190 #earthquake located at El Hierro, hundreds still to be analyzed...swarm still going on, the strongest since June 2012. #geology #volcano reageer retweet

quote:

1198623 20/03/2013 18:44:39 27.7551 -18.1623 17 2.4 mbLg W FRONTERA.IHI [+]
1198573 20/03/2013 15:12:50 27.7501 -18.1083 18 2.2 mbLg W FRONTERA.IHI [+]
1198577 20/03/2013 15:12:08 27.7582 -18.1021 18 1.9 mbLg W FRONTERA.IHI [+]
1198545 20/03/2013 14:30:27 27.7293 -18.0276 13 1.9 mbLg SW FRONTERA.IHI [+]
1198515 20/03/2013 12:55:42 27.7594 -18.1195 17 1.6 mbLg W FRONTERA.IHI [+]
1198339 20/03/2013 04:54:23 27.7772 -18.1518 17 1.5 mbLg W FRONTERA.IHI [+]
1198336 20/03/2013 04:53:04 27.7704 -18.1247 15 1.5 mbLg W FRONTERA.IHI [+]
1198333 20/03/2013 04:52:03 27.7781 -18.1415 17 2.4 mbLg W FRONTERA.IHI [+]
1198320 20/03/2013 02:08:38 27.7899 -18.1429 15 1.9 mbLg W FRONTERA.IHI [+]

quote:

2013-03-21 07:48 UTC
- Yesterday ended with 24 volcanic earthquakes in total
- The image below shows a new (short) period with volcanic earthquakes. The strong tremor at the start tells us that the magma reached other channels. The hypocenter depth remained however in the 16 to 18 km layer.
- The 3th map shows the deformation of the island and as could be expected with such a crisis, the activity is also confirmed in the deformation which is a mainly eastern and upwards (center and right parts of the graph)
- Another map shows the location of the epicenters of todays earthquakes. No real change vs yesterday and 2 days ago.

twitter:

teideano twitterde op donderdag 21-03-2013 om 08:45:43 Sun rises at El Hierro. and the party is on again. #volcano #geology #earthquake #geología #terremoto http://t.co/xdNrqjhJTH reageer retweet

twitter:

teideano twitterde op donderdag 21-03-2013 om 08:50:26 three hours ago, the situation was just this.... #volcano #geología #geology #earthquake http://t.co/A9SxMLMaKq reageer retweet

twitter:

teideano twitterde op donderdag 21-03-2013 om 12:10:25 Our stations at El Hierro begin to move eastward..... #geology #volcano #gps #earthquake http://t.co/0j56hRAnZb reageer retweet

twitter:

teideano twitterde op vrijdag 22-03-2013 om 00:00:49 strong quake at El Hierro. Widely felt!!! #geology #volcano #earthquake reageer retweet

twitter:

teideano twitterde op vrijdag 22-03-2013 om 01:14:31 Gps Motion at one of our stations in El Hierro. Look at the last two dots.....seems upward movement is speeding a bit http://t.co/FlgfBUGWPJ reageer retweet

twitter:

teideano twitterde op vrijdag 22-03-2013 om 08:45:27 a new morning arrives at El Hierro. swarm still highly energetic. hundreds of quakes tonight. #volcano #geology http://t.co/1YN3DbFjvZ reageer retweet

twitter:

teideano twitterde op vrijdag 22-03-2013 om 13:36:55 #volcano #geology #science Rn measurements vs seismicity >2,5 at El Hierro... http://t.co/6h2LfbFSM2 reageer retweet

quote:

2013-03-23 18:32 UTC
- 127 earthquakes so far today (strongest activity since the start of this seismic crisis)
2013-03-23 15:32 UTC
- Another strong M3.5 earthquake
- If confirmed, there might be a tendency of shallower earthquakes in the 12 to 14 km layers. The graph below is the El Julan seismograph
- Our current reporting is getting more spectacular every hour

twitter:

teideano twitterde op zaterdag 23-03-2013 om 19:11:54 Ground shaking almost constant right now at El Hierro. At least 20 felt in the last 10 minutes. #volcano #geology #earthquake reageer retweet

twitter:

teideano twitterde op zaterdag 23-03-2013 om 19:16:43 @Suw Ab-so-lu-te-ly INCREDIBLE.....HOLY COW!!!! http://t.co/MXI2ZSBcPN reageer retweet

twitter:

teideano twitterde op zaterdag 23-03-2013 om 19:36:16 Reports at some places of 4 minute long shakes....this is going insane.... http://t.co/zs9O7T5JJH reageer retweet

twitter:

teideano twitterde op zaterdag 23-03-2013 om 17:06:52 2012 vs 2013 at El Hierro. Are we in the brink of an #eruption? #volcano #earthquake #geology #science http://t.co/vAHKQcuw37 reageer retweet

twitter:

teideano twitterde op zaterdag 23-03-2013 om 20:52:59 Between 17.50 and 18.00, 5 quakes over 3.0 at El Hierro.... now it seems to ease a little bit. Time to relax. #volcano #geology reageer retweet

quote:

van de IGN site
1199622 23/03/2013 18:01:27 27.7685 -18.1888 13 3.0 mbLg W FRONTERA.IHI [+]
1199629 23/03/2013 18:00:28 27.7402 -18.2400 12 Sentido 3.4 mbLg W FRONTERA.IHI [+]
1199625 23/03/2013 17:56:30 27.7530 -18.1957 13 3.0 mbLg W FRONTERA.IHI [+]
1199623 23/03/2013 17:52:10 27.7607 -18.2142 13 3.0 mbLg W FRONTERA.IHI [+]
1199621 23/03/2013 17:50:37 27.7521 -18.2031 12 3.1 mbLg W FRONTERA.IHI [+]
1199620 23/03/2013 17:49:38 27.7549 -18.2107 17 2.9 mbLg W FRONTERA.IHI [+]

quote:

2013-03-24 13:24 UTC
- Believe it or not, but already 104 M2+ volcanic earthquakes below El Hierro so far today, thats more activity than yesterday at this time of the day. Yesterday ended with 165 volcanic earthquakes.
- Hypocenters in the 15 to 17 km layer
- When pinting the center of the current action (last 15 earthquakes) on a Google earth map, we arrive at a seabed depth of 1800 meters

2013-03-24 08:48 UTC
- Our daily M2.5 earthquake list looks like only the Canary Islands exist today.
- The scientists who said a couple of days ago that this crisis wont end in an eruption as the strength was not enough to reach the seabed, may start to write a second opinion. The crisis goes on and is a lot stronger than the last episode. Some more facts :
- 62 M2+ earthquakes so far today = hundreds of volcanic earthquakes of we would also count the weaker ones (which IGN did at the start in 2011)
- Hypocenter or focal depths (breaking point in the layers below the island) 16 to 17 km depth (4 to 5 km deeper than yesterday).
- The epicenter locations have shifted a little to the West (main reason for the deeper hypocenters).
- Deformation statistics are very spectacular as the Sabinosa GPS has been forced upwards with 2 cm the last 24 hours (see image University of Nagoya below ). The same GPS was also forced 1 cm to the East. North/South remained the same.

quote:

2013-03-23 19:15 UTC
- 134 earthquakes so far today (strongest activity since the start of this seismic crisis)
- Hypocenters gradually shallower (12 to 14 km layer) which indicates that the magma is reaching cracks in higher levels. Too far out in the sea to generate a Surtseyan eruption if a new vent would emerge (seabed depth 1000 to 1300 m)

quote:

Op maandag 25 maart 2013 10:38 schreef Jumparound het volgende:

[..]

eerst zien, het pad wat de lava volgt zal echt niet recht zijn

twitter:

teideano twitterde op maandag 25-03-2013 om 10:11:13 @eruptionsblog @jonfr500 @rschott @davidmpyle @pabloj_gonzalez One of our gps has gone out of scale just in the Up motion.... reageer retweet

twitter:

teideano twitterde op maandag 25-03-2013 om 10:11:13 @eruptionsblog @jonfr500 @rschott @davidmpyle @pabloj_gonzalez One of our gps has gone out of scale just in the Up motion.... reageer retweet

twitter:

teideano twitterde op maandag 25-03-2013 om 11:58:33 Up-Down with our brand new 20cm scale limit...lol. @eruptionsblog @pabloj_gonzalez @rschott @davidmpyle @jonfr500 http://t.co/IwbD3QLfgQ reageer retweet

twitter:

teideano twitterde op maandag 25-03-2013 om 08:29:19 @eruptionsblog up to 4.0 tonight.what we have to watch is the management of this. "magma adjustment" is the official explanation. WTF??? reageer retweet

twitter:

eruptionsblog twitterde op maandag 25-03-2013 om 14:18:48 @teideano Is there an official statement about all this on an IGN website or is all that info found on the AVCAN Facebook page? reageer retweet

twitter:

teideano twitterde op maandag 25-03-2013 om 14:33:47 @eruptionsblog There´s an absolute silence from the autohirities regarding this process. They talk about a "normal scenario" (sic) reageer retweet

twitter:

teideano twitterde op maandag 25-03-2013 om 14:35:03 @eruptionsblog IGN has not made any official statement about what´s going on....just some radio and press comments ´bout "re-adjustment" reageer retweet

twitter:

teideano twitterde op maandag 25-03-2013 om 14:36:51 @eruptionsblog anf the funniest one, but i´m sure is not from IGN, no measures will be taken, because seismicity is located off-shore. O_O reageer retweet

twitter:

teideano twitterde op maandag 25-03-2013 om 16:02:30 4.1M Right now....there we go again... @eruptionsblog @pabloj_gonzalez @rschott @etnaboris @jonfr500 @davidmpyle #volcano #geology reageer retweet

quote:

2013-03-25 15:06 UTC
- The strong quakes are currently generating rockfall near Sabinosa ! (based ona report from a person living there)
2013-03-25 15:03 UTC
- A few minutes ago we had the strongest earthquake from this crisis, a M4.1 at 16 km depth (same area out in the sea). The image below shows this earthquake on the seismogram and not a piece of art . Just before the 4.1 one, we had a M3.4 one, also at a depth of 16 km.

quote:

2013-03-25 15:16 UTC
- This is without any doubt one of the most powerful earthquake sessions since the start of the eruptive process at El Hierro. Readers will be surprised about the number of very powerful events when they are listed by IGN.
Luckily for El Hierro everything is happening out in the sea at a depth of +1500 meter. A volcano has however NO guarantee at all that the action will stay in that area. The same happened during the eruption in 2011 when the magma vent was located in a totally different area than the earthquake epicenters. This was however an exception.

twitter:

teideano twitterde op maandag 25-03-2013 om 16:27:16 #geology #volcano #earthquake El Hierro now into an ongoing quake cluster. @eruptionsblog @pabloj_gonzalez @rschott http://t.co/KVivJbWtrw reageer retweet

twitter:

teideano twitterde op maandag 25-03-2013 om 17:02:37 31 quakes have been at least 3.0 today. seven in the last 40 minutes.... reageer retweet

quote:

Op dinsdag 26 maart 2013 00:17 schreef GekkePoes het volgende:
Maar waar zit nu die rots die los zou kunnen breken. of is dat een ander eiland?

quote:

2013-03-26 14:00 UTC
- This image taken yesterday by residents of El Pinar shows rockfall close the lighthouse of Orchilla. Credit of image to Volcanes de Canarias.

2013-03-26 13:30 UTC
- PEVOLCA has decided to keep alert level GREEN after their meeting today. They argue there is no significant risk to the population to take any extraordinary measures.
- Also, according to them, there is a 75% chance of a M4.3+ earthquake .

Batimetría Volcán submarino El Hierro

quote:

Bathymetry of the El Hierro submarine volcano generated in March 2013 during the campaign Vulcano0313, promoted by the Spanish Institute of Oceanography.

twitter:

teideano twitterde op woensdag 27-03-2013 om 13:38:43 http://t.co/ePez5UKHKF El Hierro #volcano bathymetry, 2011-2012 eruptive cone #eruption #geology #science courtesy of IEO reageer retweet

twitter:

teideano twitterde op woensdag 27-03-2013 om 14:11:46 Who said you can go home?? There we go... #volcano #earthquake @rschott @VolcanoReport @Suw El Hierro is not over.... http://t.co/4daVopP0WB reageer retweet