[Vulkanen] The ring of Fire #3: Eruption of Mayon?

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Phivolcs notes 3 minor ash explosions at Mayon

More At least three minor ash explosions were recorded at Mayon Volcano in Bicol early Tuesday, prompting authorities to appeal anew to the public to stay away from the volcano's danger zones.

The Philippine Institute of Volcanology and Seismology (Phivolcs) said the three minor ash explosions were recorded at 5:37 a.m.

"These events lasted for about three minutes. The explosions produced a brownish ash column that rose about 700 meters above the crater and drifted to the southwest," it said in its advisory.

On the other hand, Phivolcs said a "faint crater glow" was observed Monday night.

Radio dzXL reported Tuesday noon that the Phivolcs has started coordinating with the Albay Public Safety and Disaster Management Office to prepare for possible evacuation of residents.

The Phivolcs said that in the last 24 hours, the seismic network recorded 11 volcanic earthquakes.

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Seismologen vrezen nu uitbarsting vulkaan op Sumatra

Seismologen vrezen dat de aardbeving en mogelijke naschokken voor de kust van Sumatra kunnen leiden tot vulkaanuitbarstingen. Op Sumatra liggen drie grote vulkanen: Merapi, Talang en Tandikat. Op Sumatra, een van de grootste eilanden ter wereld, leven meer dan veertig miljoen mensen.

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Op donderdag 1 oktober 2009 16:12 schreef Frutsel het volgende:

[..]

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Fresh lava domes fill most of the 10,000-year old caldera of Chaitén volcano. Dome 1 began forming in May of 2008, when Chaitén erupted for the first time in written history. Dome 2 began growing later, in the fall of 2008. Shifting winds were blowing the plume of ash and steam to the southeast, revealing the northern and western sides of the two domes (the southern side of Dome 1 was visible on September 27, 2009).

According to Servicio Nacional de Geología y Minería [SERNAGEOMIN—the Chilean National Geological and Mining Service (translated by The Volcanism Blog)], the dome complex is currently growing steadily. Active lava domes are extremely unstable and dangerous. They are often steep-sided, composed of weak rocks, and prone to frequent collapses. A lava dome collapse can release one type of pyroclastic flow, a fast-moving landslide composed of extremely hot rocks, ash, and gas.

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Op donderdag 1 oktober 2009 16:14 schreef Againzender het volgende:

[..]

is het wel eens voorgekomen eigenlijk dat vulkaanuitbarstingen getriggered werden door aardbevingen?

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Large earthquakes may trigger volcanic eruptions
10 December 2008

Large earthquakes can trigger volcanic eruptions up to a year later and up to 500 kilometres away from their epicentres, according to new research


^{Parinacota volcano, Chile}

The findings suggest that volcanoes in regions of high earthquake activity should be more closely monitored after a large earthquake has struck.

Sebastian Watt and colleagues Professor David Pyle and Dr Tamsin Mather from the University of Oxford analysed continuous records of earthquakes and volcanic eruptions from southern Chile going back to 1850. Records since then include 206 eruptions from 25 different volcanoes.

Two major earthquakes in 1906 and 1960 led to a large rise in the number of volcanic eruptions in the year following each earthquake. Before the end of 1907, seven volcanoes erupted and by the end of 1961 after the 1960 earthquake, there were six eruptions. On average, the researchers say, there are 1.32 eruptions every year in this region.

Watt and his colleagues also studied data from records that weren't continuous, and linked two large earthquakes in 1751 and 1835 to an increase in volcanic activity in the area. The work is due to be published in the journal Earth and Planetary Science Letters.

'We had access to data going back to 1550, but decided not to include large chunks of it because it wasn't continuous and therefore wasn't completely reliable,' says Watt.

^{'This could also be happening in other areas with
high earthquake and volcanic activity, like Indonesia and Alaska.'
Sebastian Watt, University of Oxford}

Charles Darwin also noticed that volcanoes to the north of the 1835 earthquake in Concepción, Chile were 'in great activity' a few days after the earthquake and the whole of the volcanic chain was active for the rest of the year.

Despite Darwin's observations, linking large earthquakes with volcanic eruptions is a fairly young science and many scientists have been sceptical.

'Previous studies looked at global datasets, where it's very difficult to elucidate a link on a timescale longer than a few days,' says Watt.

Looking at the detail
Watt and his team took a different approach. They are the first to look at a longer timescale and focus on a specific area. Along the continental margin - where the oceanic crust meets the continental crust - Chile has some of the largest earthquakes in the world with magnitudes over eight on the Richter scale.

Next to the continental margin, following the Andes, the country also has numerous active volcanoes in a so-called 'arc' - where one tectonic plate moves beneath another.

'At the moment the precise process causing eruption is unclear. Given the distance at which this eruption-triggering happens, we suggest that seismic waves radiating from the earthquake zone disrupt bodies of molten rock beneath volcanoes eventually leading to eruption.

'The same process could also happen in other areas with high earthquake and volcanic activity, like Indonesia and Alaska.

'The next step is to investigate the mechanisms causing this by studying specific eruptions and looking at the rocks spewed out,' Watt adds.

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Cleveland volcano erupts in Alaska

CHUGINADAK ISLAND, ALASKA (BNO NEWS) – Alaska’s Cleveland Volcano briefly erupted on Friday evening, according to volcanologist on Saturday, but no one was thought to be at risk.

Friday’s eruption was described as being brief and started at around 11.30 p.m. local time (0730 UTC). According to the Alaska Volcano Observatory (AVO), satellite data indicated that the Cleveland volcano was producing an ash cloud to maximum altitudes of 15,000′ to 20,000′ (4.5 to 6.1 kilometers).

In response to the eruption, the center raised the aviation color code to Orange and the volcano alert level to “Watch.”

“The lack of a real-time seismic network at Cleveland means that AVO is unable to track local earthquake activity related to volcanic unrest,” a statement from the agency said. “Short-lived explosions with ash plumes that could exceed 20,000 ft above sea level can occur without warning and may go undetected on satellite imagery.”

The volcano is located on the western half of Chuginadak Island, a remote and uninhabited island in the east central Aleutian Islands of Alaska. It is located about 45 miles (75 kilometers) west of the community of Nikolski, which has only a few dozen residents. Cleveland has seen an increase in activity over the past decade. Friday’s eruption marks the third one this year, with earlier eruptions in January and June.

The volcano’s most recent significant eruption began in February of 2001, when it produced three explosive events that created ash clouds as high as 39,000 ft (12 kilometer) above sea level. The eruption also produced a lava flow and a hot avalanche that reached the sea.

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Op zaterdag 3 oktober 2009 22:11 schreef Frutsel het volgende:
[ afbeelding ]

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Op donderdag 1 oktober 2009 16:28 schreef Frutsel het volgende:
Zeker wel... de meeste vulkaanuitbarstingen gaan gepaard met aardbevingen. Vaak zijn die kleine bevingen juist de voorbode. Maar een grotere kan zeker een vulkaan triggeren, maar tis niet zo dat het altijd zo is.

In maart 2009 brak er een vulkaan open in de Stille Oceaan bij Tonga... toevallig was die dag ervoor een quake van 7.9 geweest

Vulkaanuitbarsting in Grote Oceaan

Maar geen idee of het in dit geval echt wetenschappelijk bewezen is dat één het gevolg is van het andere.

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Montserrat
Die foto

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An observation flight showed extensive growth of the lava dome on the southern side, although cloud obscured the other faces. The full extent of pyroclastic flows associated with lava dome growth and collapse over the last six days is now known. Pyroclastic flow deposits extend to 3 km down the White River valley to the south; 1 km down Gages valley to the west; 2.5 km down Tyers Ghaut to the north-northwest. In the last 24 hours pyroclastic flows have begun to move down Tuitts Ghaut and into Whites Ghaut, reaching 3 km to the northeast. No pyroclastic flow deposits were identified in the Tar River valley associated with this renewed phase of dome growth.

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Activity was high on Friday October 16 with several large pyroclastic flows reaching the sea down the White River to the south. In addition there were a number of moderate sized pyroclastic flows to the north east moving down Tuitts and White Bottom Ghaut to about 3 km from the lava dome. Only one or two small pyroclastic flows moved down Tyers Ghaut.

The extensive ash clouds formed rose to a maximum of 20,000 ft moved to the west-northwest and resulted in only minimal ash fall in inhabited areas. Activity decreased at around 5 pm on October 16, and since that time rockfalls and pyroclastic flow signals appear to be occurring in discrete cycles around 2.5 - 3 hours apart. Similar cyclicity has been recognised previously at the volcano, the last time being during the activity in December 2008.

MVO, 10:00 am, October 17, 2009

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Vulkaan Mayon op Filipijnen weer actief
De Mayon-vulkaan op de Filipijnen heeft as in de lucht geslingerd. De asregen kwam neer op verschillende dorpen aan de voet van de 2.472 meter hoge vulkaan, 375 kilometer ten zuidoosten van Manilla. Het vulkaaninstituut waarschuwde voor een mogelijke uitbarsting en riep de bewoners op ver van de krater weg te blijven.

De Mayon is de laatste 400 jaar een vijftigtal keer uitgebarsten. In 1814 kwamen op de hellingen 1.200 mensen om het leven. Bij een uitbarsting in 1993 stierven 79 mensen. Toen de vulkaan in 2006 actief werd, moesten 30.000 mensen in veiligheid gebracht worden.

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Philippines' Mayon volcano spews ash, could erupt

MANILA, Philippines — The cone-shaped Mayon volcano in the central Philippines, which killed scores in an eruption 16 years ago, shot up an ash plume Wednesday — prompting hundreds of nearby residents to evacuate in case it blows again.

Chief state volcanologist Renato Solidum said the alert level remains the same at Mayon, the country's most active volcano, but that if magma continues to rise below the glowing crater there could be another eruption within weeks.

In Daraga township south of the volcano's crater, Mayor Cicero Triunfante ordered the early evacuation of more than 800 residents in the villages of Matnog and Banadero on fears that it might be in the path of superheated volcanic debris called pyroclastic flow.

Elsewhere, officials distributed wireless public address systems to more than 700 village and town officials to help them make emergency evacuation announcements if necessary, said provincial disaster officer Cedric Daep.

He said mass evacuations would be ordered once the Philippine Institute of Volcanology and Seismology raises the alert to the next higher level. About 30,000 people were evacuated when it last erupted in 2006.

Officials repeated warnings over radio stations early Wednesday against mountain climbing, gathering orchids, farming and other "human activities" on the slopes of the 8,070-foot (2,460-meter) volcano, Daep said.

Resident volcanologist Ed Laguerta said ground measurements showed that the upper slopes of Mayon were slightly inflated, indicating the presence of rising magma, and that minor ash explosions are to be expected. Hourly measurements were being taken, he added.

Two explosions early Wednesday sent ash and rocks more than half a mile (a kilometer) into the air. A thin layer of ash fell on the nearby towns of Camalig, Guinobatan and Ligao on Mayon's southwestern foothills.

Mayon's most violent eruption, in 1814, killed more than 1,200 people and buried a town in mud. A 1993 eruption killed 79 people.

Typhoon-triggered mudslides near the mountain in 2006 buried entire villages, killing more than 1,000 people.

The Philippines is in the Pacific "Ring of Fire," where volcanic activity and earthquakes are common

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Denpasar (ANTARA News) - The status of Mt Batur in Kintamani, Bali, has been raised from active-normal to alert due to its increasing activity as recording 21 times of vulcanic tremor with a maximum amplitudo of 1-12 MM since September

"This happens because the volcano that last erupted in 2000 has shown an increasing activity, as seen by the black smoke coming out of the mountain several times," head of the mountain`s monitoting center, Anak Agung Anom Karsana, said here on Monday.

Under a normal condition tremor happens only five times a day but now it reaches 60 times a day and it is felt by people living within a radius of one to two kilometers from the mountain, he said.

He said he had banned people or tourists from climbing the mountain.

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Wednesday, November 11, 2009
Batur Volcano, Bali, Indonesia - John Seach
Posted by John Seach
Hiking trail has been closed at Batur volcano in Bali, Indonesia due to fears of an eruption. Since 1st November 2009 there have been 53 deep and 83 shallow volcanic earthquakes. Evacuation will be necessary if the alert level is raised to the next higher level. Currently residents are allowed to continue activities around the volcano, but should stay away from the summit area. Batur volcano is a popular tourist location on Bali, and offers spectacular views of one of the world's most impressive calderas. The last eruption of Batur volcano was in 2000 when ash emissions reach a height of 300 m above the summit.

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Op woensdag 11 november 2009 21:14 schreef Frutsel het volgende:
Mayon is een gevaarlijk vulkaantje idd
Bali dus ook... ook in beide gebieden aardbevingen... Filijpijnen kreeg een 5.5 vandaag

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Karangetang volcano (Siau Island, Sangihe Islands): small explosions
Navigation:
All news about: Karangetang volcano (Siau Island, Indonesia): news & eruption updates

Karangetang is active again, as the GVP/USGS editors report citing local newspaper sources. Batur might be getting active. According to news articles, a pyroclastic flow and a lahar occurred on 4 November. Residents saw active lava flows the next day. On 11 November, incandescent material was ejected
5 m into the air.

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Chaitén volcano (Chile), eruption update: growing lava dome
09h25 AM | Age: 3 hrs
Chaitén's lava dome continues its growth and can shed pyroclastic flows and produce ash eruptions at all times. The alert level remains at its highest (red).

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Op donderdag 12 november 2009 12:39 schreef Frutsel het volgende:
WTF
Is dat een photoshop foto?

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Op donderdag 12 november 2009 13:35 schreef Frutsel het volgende:
Vind het een superheftige foto

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Op donderdag 12 november 2009 13:41 schreef Jumparound het volgende:
Hoeft geen gesoepte foto te zijn trouwens.

Chile: Tierra de volcanes. Erupción en Chaitén

...::::::::::ERUPCION VOLCAN CHAITEN CHILE::::::::::...