[Vulkanen] The ring of fire #5: Het blijft actief

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Op donderdag 17 februari 2011 21:49 schreef Isiolo het volgende:
grappig dat er wel overal momenteel wel wat activiteit is. Zit er iets aan te komen ?

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February 21, 2011 MANILA, Philippines Hundreds of villagers fled to safety Monday after a restive volcano belched ash and smoke into the sky after a monthlong lull, officials said. Despite Mount Bulusans ash explosion, its 13th since November, there were no signs of an imminent eruption involving magma pushing out of the cone, said government chief volcanologist Renato Solidum. The huge plume of grayish smoke shot up to more than a mile (2 kilometers) toward the blue sky, with the ash drifting southwest toward four farming towns in Sorsogon province, where about 1,200 villagers fled to emergency shelters and houses of relatives, said Benito Ramos, who heads the governments disaster-response agency. Army trucks helped villagers move from communities hit by the ashfall and emergency teams handed out protective masks, Ramos said. There have not been any government orders to evacuate communities near the mountain. While many scrambled to safety, residents streamed out of houses in Irosin town to gaze or take pictures of the mid-morning spectacle using their cellphones. Still-hot debris at the peak of Bulusan, one of the countrys 23 active volcanoes, came into contact with water, sparking the explosion. Such steam-driven blasts have happened since November and could continue in coming weeks, Solidum said. -Macon.com Star

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2000 evacuated after Bulusan spews ash
JUBAN,Sorsogon - Two thousand affected residents around Mt. Bulusan were evacuated immediately after the latest ash explosion at around 9:30 a.m. Monday, a military official said.

Lt. Col. Santiago Enginco, commanding officer of the 49th Infantry Battalion based in Juban town, said he immediately deployed 5 military vehicles to assist the evacuation at around 10 a.m.

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Op maandag 21 februari 2011 09:28 schreef zenkelly het volgende:

[..]

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Ik probeer nog een keer het Bulusan topic leven in te blazen

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Er was een topic over in november, maar de animo was daar erg groot zag ik
Evacuaties na uitbarsting vulkaan op de Filipijnen

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Op maandag 21 februari 2011 09:45 schreef zenkelly het volgende:
[..]

Had dat topic niet eens gezien,. .Je bent ook de enige die gepost heeft .

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Mt Baker: Eruption is overdue...
Cloaked in snow and visible across the U.S. border from Vancouver, Mount Baker looks like a gentle giant.

But volcanologist Mark Jellinek, at the University of British Columbia, says Mount Baker, located in Washington state, is probably overdue for an eruption -an explosion he and his colleagues hope to predict well in advance based on the how much "wagging" goes on inside the volcano as magma rises up from the deep.

According to their research, to be published Thursday in the journal Nature, volcanoes shake and vibrate in distinct and predictable ways when they are going to blow because giant columns of magma "wag" back and forth inside them.

"It's basically like a dog wagging its tail," says Jellinek, except that the magma columns are up to a kilometre high.

They are so powerful they shake mountains and when they blow they can hurl hot ash up to 40 kilometres into the atmosphere, with sometimes devastating impact as the ash spreads across surrounding areas. (Vancouver is far enough from Mount Baker it will be spared the worst effect, though Jellinek says he expects the city could be covered in a thick layer of fine ash. "It would make a huge mess," he says.)

It has long been known that volcanoes vibrate at pretty much the same frequency before they explode, whether they are in B.C., Alaska, the Caribbean or the Philippines. But until now no one has been able to explain why volcanoes that are so different in size and character behave in the same way.

"Magma wagging" is the most plausible explanation yet, and may help forecast deadly eruptions, say Jellinek and David Bercovici from Yale University and co-author of the new study.

Their model of the "magma wagging" explains why tremors in nearly all explosive volcanoes stay in a narrow band of frequencies that can be felt but are so high humans can't hear them. Just before and during eruptions, the frequency climbs to a higher pitch, and the range spreads out.

It provides "a fundamental mechanism for tremor that is generic to nearly all volcanically explosive systems," the researchers report.

As Bercovici put it, the shaking is both a warning "and a vital clue about what is going on in the belly of the beast."

There can be weeks to months of warning before volcanoes erupt but some come to life quickly. "The most recent eruption in the Aleutians in Alaska had five hours notice," says Jellinek. "But in general we do better than that."

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Op zondag 27 februari 2011 01:17 schreef zenkelly het volgende:
THNXS!!

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Op maandag 28 februari 2011 18:35 schreef Isiolo het volgende:
http://www.boston.com/big(...)er_journey_to_t.html

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Eruptions continue at Fuego volcano, Guatemala. During the night incandescent explosions ejected lava 100 m above the crater and sent avalanches down surrounding valleys. Rumbling sounds were heard and audible degassing lasted up to six minutes at a time. Ash emissions reached a height of 800 m above the crater and drifted south and southwest.

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On 3rd March 2011 an explosion occurred from Caliente crater at Santa Maria volcano in Guatemala. Ash emissions reached 10,800 ft above sea level and produced ashfall in towns to the west and southwest of the volcano. The explosion generated a pyroclastic flow which moved 2.5 km down the southwest flank. Activity continued on 4th March with moderate explosions ejecting ash to a height of 11,000 ft above sea level, and ash fall on surrounding farms.

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Mt Ruapehu (NewZealand) is heating up
Mount Ruapehu is heating up -- but there's no need to panic, a volcanologist says.

Ruapehu's Crater Lake has reached 40degC, the third-highest temperature recorded at the lake since 2002.

Other signs, including gas output, minor seismic activity and changes in lake chemistry were also typical of a volcano in a heating cycle, GeoNet vulcanologist Tony Hurst said.

Ruapehu entered its current heating cycle last October, the eighth since the lake was re-established in 2002 after the 1995-1996 eruptions.

Ruapehu is on volcanic alert level one, which indicates signs of volcano unrest, but Mr Hurst told NZPA that was normal for an active volcano such as Ruapehu.

The colour of the lake might change and steam might be seen wafting off it if sediments on the lake floor were disturbed by increasing gas and heat flows into the lake, he said.

Scientists would continue to monitor the situation.

At 2797m, Ruapehu is the highest mountain in the North Island, and the most recent of the North Island volcanoes to have erupted.