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

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1200 people fled Mt Karangetang
Jakarta, Indonesia (CNN) -- Some 1,200 people have fled an active volcano in northern Indonesia, the country's National Disaster Management Agency reported Monday.

The evacuations were made from two villages near Mount Karangetang, on Siau Island. The nearly 6,000-foot (1,827-meter) volcano is one of Indonesia's most active. An eruption in August killed four people.

Late last week, Indonesia's Volcanology and Geological Disaster Management Agency raised the volcano's alert status to its highest level, after noting increased activity on March 11.

Ash clouds from Mount Karangetang reached 7,500 feet (2,300 meters) over the weekend, with lava reported flowing down the mountainside.

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Volcano erupts in Central Java

A flood of volcanic material from Indonesia's Mount Merapi has buried 21 houses in Central Java.

Residents say heavy rains over the weekend turned into a boiling flood as they hit the volcano and washed down to the village of Agromulyo.

The Jakarta Post says the torrent of water was strong enough to wash sand and stone down the volcano's slope.

There have been no fatalities, but one resident told local media a family of three have suffered burns.

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NewZealand volcano shows signs of activity
The aviation alert level around Mount Ruapehu has been raised as the volcano in the central North Island shows signs of activity.

The volcano surveillance co-ordinator for GNS Science, Brad Scott, says the temperature at the crater lake is only four degrees shy of its highest ever recorded level of 42.5°C.

Mr Scott says there have also been increases in seismic activity, changes in lake chemistry and increases in carbon dioxide emission which have never been seen before while the lake is this hot.

He says the changes show the volcano is more active than usual and warrants raising the Aviation Colour Code to a yellow alert, which means airlines should be aware of the risk of an eruption.

Mr Scott says the alert level will not be raised further unless an eruption is imminent.

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Op vrijdag 1 april 2011 15:48 schreef fokthesystem het volgende:
In andere berichten noemde ik ze al zijdelings. Dat waren vulkanen nabij breuklijnen, vlak voor- of na bevingen.

Kilauea is wederom actief, er is een 'watch' opgezet en status is nu oranje. In de rift zone zijn de bevingen telkens iets sterker. Hij pufte 30 maart kjl. 500 ton sulfer dioxide uit. Binnen een mijl wind mee is dit dodelijk.
Rond/onder de krater zijn 29 bevingen geweest afgelopen 24 uur waarvan 5 'long term' Op een webcam (de tekst is er maar dat is geen link) is de eerste lava al zichtbaar.

De volgende zijn recent actief geworden :
de san miguel in el salvador
de rabaul New britain
de Karangetang, Api Suau
de Kilauea, USA
de bagana, Bougainville
de Bulusan, Luzon (?) gemeld door Tokyo VAAC
En wat langer geleden, hier niet in het nieuws en volgens experts een 'anomalie' de Karymsky in oost-kamchatka (rusland) bevingen, 3,5 Km hoge pluimen. Ontdekt door satelliet beelden. Deze is 7700 jaar 'jong'.

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Residents urged to leave Taal Volcano area
LOCAL Government Secretary Jesse Robredo urged the Provincial Government of Batangas to make the necessary preparations for possible evacuation and relocation of residents near the restive Taal Volcano.

The diminutive volcano continues to show heightened activity and is under alert level 2, according to the Philippine Institute of Volcanology and Seismology (Phivolcs).

Post your online prayers for Japan earthquake victims

Alert Level 2 indicates unrest probably of magmatic origin that could eventually lead to eruption.

Robredo said the local disaster risk reduction management council should identify possible relocation sites such as public schools and town plazas where affected residents may temporary seek shelter should an eruption happen.

The council should also constantly coordinate with the Philippine National Police (PNP) and the Bureau of Fire Protection (BFP) who can help them during evacuation and relief efforts, he said.

Emergency assistance should also be rendered by Department of Interior and Local Government (DILG) local personnel through formulation of a responsive and doable contingency plan, and proper utilization of calamity funds.

So far, around 100 families have left the four-kilometer radius permanent danger zone (PDZ) but thousands continue to defy the appeal of local authorities because the situation there has not yet worsened.

Lipa Archbishop Ramon Arguelles on Tuesday added to the snowballing calls for residents to evacuate the area near the perilous Taal Volcano. “They should evacuate as this is also for their own safety."

The bishop, however, admitted that authorities must equally understand the continued refusal of residents to leave.

Still, the bishop said people must continue to pray so that disaster would not strike the area.

“Let us not be pessimistic… God is good. He will not allow the volcano to erupt,” said Arguelles.

From 21 volcanic earthquakes last Saturday, the seismic activity dropped to 11 on Tuesday, Phivolcs said in a separate advisory. But this does not guarantee that Taal has simmered down.

Phivolcs said the alert status remains hoisted over Taal because magma has been intruding towards the surface, as manifested by high carbon dioxide emissions and continued seismic activity.

Water temperature also slightly increased from 30 to 30.5 degrees Celsius in the past 24 hours.

With this, state volcanologists advised the public that the Main Crater, Daang Kastila Trail and Mount Tabaro are still strictly off-limits because sudden hazardous steam-driven explosions may occur and high concentrations of toxic gases may accumulate.

“Breathing air with high concentration of gases can be lethal to human, animals and even cause damage to vegetation,” the advisory read.

Health officials earlier said that an ash explosion could cause respiratory problems, eye irritation and even skin diseases due to its high chemical content. Excessive exposure to carbon dioxide, meanwhile, can pose asthma attacks.

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Schools shut as volcano erupts

Ecuador shut schools in four towns near the Tunguarahua volcano as ash spewed more than two miles into the sky, damaging crops and endangering the health of nearby residents.

Authorities are urging people to cover their mouths and noses with masks and shut windows amid the furious venting of Tunguarahua that began on Monday.

The state Geophysical Institute said lava was flowing from the summit caldera - crater - down the flanks of the 16,480ft peak, 85 miles south east of the capital Quito.

The Education Ministry said classes in the nearby towns would be suspended.

Tunguarahua has been active since 1999. Its eruptions killed at least four people in 2006.

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Op dinsdag 3 mei 2011 19:31 schreef kahaarin het volgende:
Oh, Latijns Amerika nu aan de beurt?

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Op dinsdag 3 mei 2011 19:37 schreef Frutsel het volgende:

[..]

Ecuador staat op ploffen... net als Taal op de Filipijnen
ze lijken echter nog een zetje nodig te hebben

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Op dinsdag 3 mei 2011 23:35 schreef ScudRaket het volgende:

[..]

Is het niet zo dat de druk constant een beetje wordt afgezwakt en dat hij meer een soort continue stoom afblaast?

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Indonesia:
A volcano that hasn't been in the news lately in Indonesia appears to be showing signs of restlessness, namely Gamkonora. This is amusing because just yesterday I was looking at my IAVCEI Volcanoes calendar and noticed an anniversary coming up this week of a 1673 eruption of the same volcano and I thought "I haven't heard much of Gamkonora lately". Ask and ye shall receive, eh? Anyway, Gamkonora is on Halmahera and is part of a larger caldera system. Interestingly, the GVP reports that it last erupted in 2007, but obviously with little fanfare (except these NASA and ESA images - see below). Most of the previous eruptions over the last few hundred years have been VEI 1-2 (small), but the 1673 eruption is estimated to be a VEI 5, so the potential is there. The latest report from Gamkonora mentions white plumes coming from the summit and a sulfurous odor, prompting an elevation of the alert status to 2. Indonesia is still recovering from its last major eruption at Merapi, with the government taking charge to move people displaced by the eruption to safer, permanent homes.

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JMA raises volcanic alert on Mount Aso
Visitors to Japan have been told not to go within one kilometre of Mount Naka, after the volcanic activity at Mount Aso was raised from level one to level two.

The Japan Meteorological Agency (JMA), is concerned that debris from the active volcano could be launched from Mount Naka as well, the Associated Press reports.

Earlier today (May 16th), a small eruption was recorded, with a 500-metre high plume of volcanic smoke observed in the skies during the morning.

Mount Naka and Mount Aso are situated on Kyushu, Japan's third-largest island, and are they part of a range of five peaks in the central cone group.

The nearby Mount Nakadake is a popular tourist spot, but is often closed off due to the volcanic gases it emits from time to time, so travellers with respiratory problems are not recommended to visit this site.

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New eruption at Japan's Aso caldera

Japan has had a quite a year within geologic activity - some of it very tragic, some of it less so. Volcanically, both Sakurajima and Kirishima have put on shows that captured the attention of the world. Now it seems that another Japanese volcano might be joining the list for 2011. The Japanese Meteorological Agency (JMA) raised the alert status today to Level 2 (from 1) for Mt. Aso on Kyushu Island. Since Friday, Nakadake at Aso produced a small, 500 meter / ~1,600 feet steam-and-ash plume (video) with minor explosions.

Aso itself is, much like Kirishima, actually a complex of volcanoes within a 24 km caldera (see the stunning image below). The current activity is centered at Nakadake, a popular hiking destination that has had some problems with volcanic gas emissions. Nakadake is the most active vent amongst 17 within the Aso caldera, producing numerous small VEI 1-2 explosions over the last few centuries - some of which have lead to fatalities. However, the Aso caldera has had larger eruptions that produced significant pyroclastic activity including a number of VEI 3 eruptions that have left noticeable ash layers. Phreatic and phreatomagmatic eruptions - interactions with water - are common at Nakadake due to the small crater lake found at the volcano (see top left).

There are a multitude of webcams pointed at Aso - so you can see if you can check out any of the action if the volcano does start erupting more vigorously. Aso does have an associated volcano observatory at the University of Kyoto, but there is current no English version.

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Taal
PHIVOLCS might have their hands full in the near future. They have been watching the Taal caldera closely as it shows signs that it could be headed for an eruption. The latest update from PHIVOLCS says that seismicity has continued unabated at the caldera and the lake water from the crater lake at Volcano Island continues to get warmer. All of this means that Taal is likely seeing magma rising under the caldera and the Alert Status currently sits at Level 2 as many people are left waiting and wondering what Taal might do.

Bulusan and Mayon
However, over the last few days, a couple other Philippine volcanoes have also gotten people's attention again. Bulusan has experienced another set of phreatic (steam-driven) explosions (video) and Mayon has seen an uptick in the number of earthquakes and rockfalls felt at that volcano. Now, these events don't mean a large eruption is imminent at either volcano, but they do suggest activity in the magmatic systems of both (not unsurprising). At Bulusan, after the Friday explosions, only 4 earthquakes were felt, but the latest update from PHIVOLCS this morning says that over 80 earthquakes were felt in 7 hours Monday (5/16) morning - but the Alert Status remains at Level 1. However, the explosions over the last week has deposited a few millimeters of ash in villages around the volcano. (I am a little irked that PHIVOLCS had to come out and tell people that the low level of seismicity in the Philippines - a tectonically active area - was in fact not caused by a planetary alignment.)

Mayon hasn't seen any type of explosions during its recent revival of activity, but vigorous steam plumes, a glow at night from the summit and these small earthquakes/rockfalls all remind is that the volcano still has magma relatively close to the surface. Mayon, too, remains at Level 1 alert.

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Op dinsdag 17 mei 2011 13:32 schreef Jumparound het volgende:
thanks frutsel,

je bent de beste mod EVAR!

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Telica volcano in Nicaragua spews ash
Managua - Nicaragua's Telica volcano spewed a massive cloud of gas and ash into the air Tuesday following several strong explosions.

Material was ejected 1.2 kilometres into the air above the crater of the 1,060-metre volcano, the seismological institute Ineter said. A total of 50 explosions were recorded.

Since May 9, Ineter has recorded 59 seismic shocks in the area, and Telica had ejected a large amount of sand on nearby cities since Friday.

Sixty nearby villages were evacuated as a precautionary measure.

The volcano is located in Leon province, some 130 kilometres north-west of Managua. It last erupted in 1948.