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

quote:

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 ?

quote:

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

quote:

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.

quote:

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

[..]

quote:

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

quote:

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

quote:

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 .

quote:

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."

quote:

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

quote:

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

quote:

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.

quote:

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.

quote:

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.

quote:

Four volcanic quakes at Mayon volcano
At least four volcanic quakes and moderate steaming were noted at Mayon Volcano in Albay in the last 24 hours, state volcanologists said on Wednesday.

The Philippine Institute of Volcanology and Seismology (Phivolcs) also said a fair crater glow can be seen by the naked eye Tuesday night.

"The seismic network around Mayon Volcano recorded four volcanic earthquakes during the past 24 hours. Steaming activity from the crater was moderate with white steam clouds drifting towards northwest. Fair crater glow (Intensity II- can be seen by naked eye) was observed last night," it said.

Phivolcs said Alert Level 1 remains in effect over Mayon Volcano, reminding the public not to enter the six-kilometer permanent danger zone (PDZ).

It cited the continuing threat from sudden small explosions and rockfalls from the upper and middle slopes of the volcano.

"Active stream/river channels and those perennially identified as lahar prone areas in the southern sector should also be avoided especially during bad weather conditions or when there is heavy and prolonged rainfall," Phivolcs added.

In Sorsogon, Phivolcs recorded two volcanic quakes and three rockfall events from Bulusan Volcano in the last 24 hours.

Steaming activity at Bulusan's thermal vents was "wispy to weak" while no steaming was observed at the summit crater.

Meanwhile, Taal Volcano in Batangas remained relatively quiet, registering no volcanic quake in the last 24 hours.

Alert Level 1 also remained over Bulusan and Taal

quote:

Volcano in eastern Indonesia erupts, spews gas cloud

JAKARTA, Indonesia — One of Indonesia's most active volcanos has erupted, sending lava and searing gas clouds tumbling down its slopes.

Volcanology official Agus Budianto said Friday that authorities were still trying to evacuate residents living along the slopes of Mount Karangetang.

There were no immediate reports of injuries or serious damage.

The 5,853-foot (1,784-meter) mountain is located on Siau, part of the Sulawesi island chain. It last erupted in August, killing four people.

Indonesia, the world's largest archipelago, is located on the so-called Pacific "Ring of Fire," an arc of volcanos and fault lines encircling the Pacific Basin.

The eruption happened hours after a massive earthquake in Japan that triggered a Pacific-wide tsunami.

quote:

Op vrijdag 11 maart 2011 13:59 schreef Frutsel het volgende:

[..]

quote:

Op vrijdag 11 maart 2011 21:57 schreef Frutsel het volgende:
Er wordt gesuggereerd dat dit een hoax is.

quote:

Op vrijdag 11 maart 2011 22:25 schreef meteo-online het volgende:

[..]

Ja las het net, video ook een hoax dan?

quote:

Op vrijdag 11 maart 2011 22:25 schreef meteo-online het volgende:

[..]

Ja las het net, video ook een hoax dan?

quote:

Op vrijdag 11 maart 2011 22:26 schreef kahaarin het volgende:

[..]

Van 2010 (2009?) schijnt.

quote:

Op vrijdag 11 maart 2011 22:34 schreef meteo-online het volgende:

[..]

Mmmmm dan is het een meester in het bewerken van video's

quote:

Op vrijdag 11 maart 2011 22:42 schreef kahaarin het volgende:

[..]

Lijkt toch echt niet waar te zijn, nu nog steeds geen officiele sites die dit melden. Alleen mensen die het twitteren.

quote:

Op vrijdag 11 maart 2011 22:49 schreef Frutsel het volgende:
Het kan de komende dagen in elk geval wel nieuw vuurwerk opleveren.

Zeker als de maan nog dichterbij komt

桜島ライブカメラ 2011-03-11 21-19 X1HD Volcano Sakurajima

quote:

Japan Earthquake Triggered Volcano Eruption In Russia?
March 11, 2011 in Earthquakes, Volcanoes.

The major earthquake that hit Japan today may have just triggered some volcanoes in Russia as well. While reports are still vague on the incident, there is a strong correlation between the two occurrences. In Russia, there are reports that earthquakes where felt during the eruption.

According to dziennik pl world (translated):

In the Russian Far East, there has been a strong volcanic eruption. The air got a great cloud of volcanic dust, which can pose a threat to air traffic in the region.

Local experts warn that, dust can rise up to a height of seven kilometers.

Explosions were accompanied by minor earthquakes. Russian service monitoring the activity of cones, however, ensure that the implemented measures guarantee the safety of residents of neighboring towns.

According to Russian media reports, the first cloud of dust covered the city of Ust-Kamczatsk. Over five thousand people are forced to stay at home. The authorities have recommended the strict ban on opening windows.

The population, however, was not evacuated, and experts say that the dust does not constitute a great danger. Despite this, from Thursday, all offices of state institutions and organizations have suspended work – except in cases of emergency. For some time, also closed roads in the region.

While this eruption does not seem to be a significant threat to the people in Russia, the fact that an earthquake in Japan could have triggered a volcano eruption in Russia does have some significance.

quote:

Op zondag 13 maart 2011 11:18 schreef zenkelly het volgende:

桜島ライブカメラ 2011-03-11 21-19 X1HD Volcano Sakurajima

[..]

Real of ook een hoax?

quote:

Vulkaan in zuiden van Japan wordt aktief
Na een zware aardbeving, een verwoestende tsunami en problemen bij een kerncentrale, staat Japan nu nog een probleem te wachten. In het zuidwesten van het land is een vulkaan actief geworden.

De vulkaan hield zich de afgelopen twee weken rustig maar begon vandaag weer met het spuwen van as en stenen. Die vlogen tot wel vier kilometer hoog de lucht in.

De activiteit van de vuurspuwende berg hoeft niet in verband te staan met de zware aardbeving van vrijdag. De ruim 1.400 meter hoge Shinmoedake is de afgelopen 52 jaar al bij vlagen actief. De berg is voorlopig ontruimd, omwonenden hoeven hun boeltje nog niet te pakken. (anp/gb)

quote:

Japanese volcano re-awakens after few weeks
TOKYO -- The weather agency says a volcano in southern Japan is spewing ash and rock again as the country struggles with the aftermath of a catastrophic earthquake and tsunami in the north.

The Meteorological Agency issued a warning Sunday saying that Shinmoedake volcano resumed activity after a couple of quiet weeks.

The mountain is on Kyushu island, 950 miles (1,500 kilometers) from the epicenter of Friday's magnitude 8.9 earthquake and resulting tsunami, which devastated much of the country's northeastern coast.

It was unclear if the eruptions were linked to quake. Japan lies on the "Ring of Fire" - an arc of seismically active zones where earthquake and volcanic eruptions are common.

quote:

Volcano in Azerbaijan erupts
Baku, Fineko/abc.az. The Ministry for Emergency Situations of Azerbaijan informs that mud volcano Shihzeyirli located in Gobustan region erupted yesterday.

The Ministry reports that the eruption was accompanied by emissions of mud and fire that rose to a height of over 50 m. Currently, the eruption continues with less intensity. The height of emissions does not exceed 1-2 m. Deep cracks formed around the crater.

Ministry’s rescue services are operating in the area of eruption. At that, the eruption is reportedly not to pose any threat to the population or agriculture.

quote:

Op dinsdag 15 maart 2011 09:59 schreef summer2bird het volgende:
Hoeveel supervulcanos zijn er nu eigenlijk actief?

quote:

Karangetang volcano spews again
Jakarta: At least 600 people have been evacuated to temporary shelters a day after Indonesian authorities issued a red alert for the Mount Karangetang volcano, a volcanologist said Saturday.

The volcano, located on Siau island off the coast of Sulawesi island, began spewing jets of hot clouds and lava Friday, prompting authorities to order the evacuations of three villages on its slopes.

Indonesia's chief volcanologist, Surono, said eruptions were continuing Saturday but there were no reports of casualties.

Surono's office Friday raised the alert level for the volcano two notches to the highest level after a series of eruptions.

'We have no choice but to order an evacuation because people were at risk of being affected by the hot clouds,' said Surono, who like many Indonesians uses one name.

He said 582 people had been moved to temporary shelters provided by the government.

Karangetang is one of Indonesia's most active volcanoes. Four people were killed during the volcano's eruptions in August last year.

Indonesia sits on the so-called Ring of Fire, an area known for frequent earthquakes and volcanic eruptions.

More than 300 people were killed in a series of eruptions at the Merapi volcano on Java island between October and November last year.

quote:

Op zaterdag 19 maart 2011 14:53 schreef Frutsel het volgende:

[..]

Wat versta jij onder actief?

quote:

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.

quote:

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.

quote:

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.

quote:

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'.

quote:

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.

quote:

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.

quote:

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

quote:

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

quote:

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?

quote:

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.

quote:

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.

quote:

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.

quote:

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.

quote:

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

je bent de beste mod EVAR!

quote:

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.

quote:

Op zaterdag 21 mei 2011 23:36 schreef Frutsel het volgende:
Grimsvotn op IJsland is ontploft

Vulkanen IJsland #16 met een Grimmige Grimsvotn.

quote:

Dieng vulkaan rommelt op Java
WONOSOBO - De Dieng vulkaan, in de buurt van de stad Wonosobo in de provincie Centraal Java, is weer actiever aan het worden. Het Meteorologisch, Klimatologisch en Geofysisch Agentschap BMKG heeft daarom de status van de vulkaan verhoogd van 'normaal' naar 'waakzaam'.

De hernieuwde activiteit van de vulkaan die voor het laatst eind september 2009 een kleine uitbarsting had, is te zien in de vorm van een kleine witte rook die uit een krater van de vulkaan komt. Bij de uitbarsting in 2009 kwam alleen een hoeveelheid warme modder omhoog. Hiervan is nu nog geen spoor te bekennen.

Het aantal trillingen in de vulkaan is ook relatief flink toegenomen. In de periode vanaf januari 2011 tot aan 18 mei 2011 werden er maar drie trillingen waargenomen. Tussen 18 en 22 mei waren dit er ineens 62. Ook komt er volgens metingen in de buurt van de Timbang krater een kleine hoeveelheid koolstofdioxide vrij.

Inwoners in het gebied worden door de wijziging van de alarm-status opgeroepen om alert te zijn op eventuele plotselinge veranderingen door de vulkaan veroorzaakt. Ze kunnen het beste ook een afstand van 500 meter tot de krater houden. Het BMKG liet ook direct weten dat er op dit moment geen enkele aanleiding is dat er een grote uitbarsting aan zit te komen.

quote:

Increase in quake activity at Mayon
At least 38 volcanic quakes highlighted a marked increase in seismic activity at Mayon Volcano in Albay in the last 24 hours, state volcanologists said Wednesday.

The Philippine Institute of Volcanology and Seismology also noted "weak to moderate" steaming activity at Mayon, which is in an area threatened by Tropical Storm Chedeng.

"The seismic network detected 38 volcanic earthquakes (in the last 24 hours)," Phivolcs said in its Wednesday update.

It added that the steaming activity was observed during cloud breaks from 6:01 to 9:20 a.m.; 2:35 to 2:55 p.m.; and 4:35 to 5:29 p.m. Tuesday.

Phivolcs said the steam varied from weak to moderate, with white steam clouds drifting towards southwest.

Also, it said a fair crater glow (Intensity II, can be seen by the naked eye) was observed from 8:47 p.m. Tuesday to 4:40 a.m. Wednesday.

Phivolcs maintained Alert Level 1 remains over Mayon Volcano, and reminded the public not to enter the 6-km radius Permanent Danger Zone (PDZ) due to the continuing threat from sudden small explosions and

quote:

Dieng vulkaan naar status 'Gevaarlijk'
WONOSOBO - De Dieng vulkaan, in de buurt van de stad Wonosobo in de provincie Centraal Java, is verder geactiveerd. Het Meteorologisch, Klimatologisch en Geofysisch Agentschap BMKG heeft daarom de status van de vulkaan verder verhoogd van 'waakzaam' naar 'gevaarlijk'.

De hernieuwde activiteit van de vulkaan die voor het laatst eind september 2009 een kleine uitbarsting had, is te zien in de vorm van een kleine witte rook die uit een krater van de vulkaan komt. Bij metingen is ook vast komen staan dat in steeds grotere hoeveelheden koolstofdioxide wordt uitgestoten. Dit reukloze en kleurloze gas is dodelijk voor mens en dier omdat het zuurstof vervangt in het bloed.

Bij steekproeven gehouden bergafwaards van de vulkaan is gebleken dat het gas vooralsnog niet ver de berghellingen afkomt. Op de brug bij Sumberejo bleef een konijn in leven bijvoorbeeld. De wolk stoom die eerder verscheen is nu steeds vaker te zien en bereikt ook wat hogere hoogten van enkele tientallen meters.

Het aantal trillingen in de vulkaan is ook relatief flink toegenomen. In de periode vanaf januari 2011 tot aan 18 mei 2011 werden er maar drie trillingen waargenomen. Tussen 18 en 22 mei waren dit er ineens 62. Sinds die tijd worden er vaak vulkanische trillingen gemeten, maar ook worden er kleine tektonische trillingen geregistreerd.

Inwoners in het gebied worden door de wijziging van de alarm-status opgeroepen om alert te zijn op eventuele plotselinge veranderingen door de vulkaan veroorzaakt. Omdat koolstofdioxide reukloos en kleurloos is, wordt de bevolking opgeroepen om zeker een kilometer afstand te houden tot de krater van de vulkaan die nu actief is.

quote:

Honderden geëvacueerd rondom Dieng vulkaan
WONOSOBO - Ruim 600 mensen uit dorpen op de hoogvlakte in de buurt van de op dit moment actieve krater van de Dieng vulkaan in de buurt van de stad Wonosobo in de provincie Centraal Java zijn eerder vandaag geevacueerd naar plekken op veilige afstand van de vulkaan.

De Dieng vulkaan werd eerder deze maand opnieuw actief en stoot inmiddels flinke hoeveelheden kleurloos, smaakloos en reukloos koolstofdioxide uit. Dit gas is zwaarder als lucht en verstikt mens en dier doordat het zuurstof vervangt in bloed.

Inwoners in het gebied wordt mede hierom dan ook ten sterkste aanbevolen om zeker een kilometer afstand te houden van de op dit moment actieve krater, de Timbang krater. Het is namelijk goed mogelijk dat er plotseling een hoeveelheid koolstofdioxide wordt uitgestoten door de vulkaan zonder dat dit direct merkbaar is.

quote:

Mexicaanse vulkaan stoot 3 km hoge aswolk uit
De Mexicaanse vulkaan Popocatépetl heeft vandaag een 3 kilometer hoge aswolk uitgestoten. Een direct gevaar voor de bevolking in het omliggende gebied is er niet, aldus het nationale centrum voor burgerbescherming in Mexico-Stad.
Aan de uitstoot van de grote hoeveelheden as gingen meerdere explosies in het binnenste van de vulkaan vooraf. Dat gebeurt wel vaker, maar een 3 kilometer hoge aswolk is ongewoon.

De Popocatépetl is een actieve vulkaan en met 5452 meter de op een na hoogste berg van Mexico. Popocatépetl betekent Rokende Berg in de taal van de Nahua, de oorspronkelijke bewoners van Mexico. De Popocatépetl ligt 70 kilometer ten zuidoosten van Mexico-Stad. (anp/adha)

quote:

Evacuaties na vulkaaneruptie Chili

Vanwege een uitbarsting van een vulkaan in het midden van Chili zijn zo'n 3500 mensen geëvacueerd. De vulkaan maakt deel uit van de Puyehue-Cordón Caulle-vulkanen.

De uitbarsting komt onverwacht omdat de vulkanen al tientallen jaren niet actief zijn.

De as reikt tot tien kilometer hoog en drijft richting Argentinië. Een vliegveld net over de grens in Argentinië is dicht en ook een drukke grensovergang is gesloten.

Voorzorg
Volgens de Chileense autoriteiten is de evacuatie een voorzorgsmaatregel en lopen de omliggende huizen geen direct gevaar. Over eventuele gewonden is nog niets bekend.

Chili is na Indonesië het land met de meeste vulkanen. In het Zuid-Amerikaanse land zijn ongeveer 2000 vulkanen.

quote:

Supervolcano eruption before the end of this century

A prominent Cambridge volcanologist, Clive Oppenheimer, has warned about the possibility of a super-volcano before the end of this century.

Talking during the 2011 Hay Festival of Literature and the Arts, Oppenheimer said he had evidence that there was a one-in-500 chance of the earth being hit by a volcano.

“The events in Japan remind us that you can have a tsunami and earthquake and a nuclear plant there as well and you can have these chain reaction events that are actually quite calamitous and they are not unimaginable,” said the Cambridge University reader.

Examining geological, historical and archeological records, the expert reminded his audience to major natural disasters of the 2010, including the Eyjafjallajokull eruption in Iceland that threatened the world by large-scale clouds of ash.

Oppenheimer also explained that “large earthquakes (category eight or thereabouts) can trigger volcanoes up to 1000km away, and that this year's devastating earthquake off Japan's coast could trigger another volcano in the vicinity.”

“Global warming and melting of the ice caps will also have an effect, because a lot of volcanoes are under the ice which, when you remove that loading, will also statistically be more likely to erupt.” he added.

Oppenheimer warned that if such an eruption was to happen tomorrow, the world would be far more vulnerable with the huge effects, both to people and to the technological world.

The volcano expert also statistically warned that within the next six months there is likely to be an eruption in Japan as a result of the recent catastrophic tsunami and earthquake in the country.

quote:

Op maandag 13 juni 2011 20:43 schreef Isiolo het volgende:
Is er eigenlijk wel een mooi topic over de Rift valley ?

Misschien nog wel een mooiere vulkaan streek dan de ring of fire.

quote:

zie ook
'Nieuwe oceaan kan Afrika in tweeën splitsen'

quote:

Op maandag 13 juni 2011 20:51 schreef barthol het volgende:

[..]

Zie de link hierboven van Frutsel

[..]

quote:

Beperkte schade bij aardbevingen Australië en Nieuw-Zeeland

In Nieuw-Zeeland heeft zich vandaag een aardbeving voorgedaan met een kracht van 6.5 op de schaal van Richter. Het epicentrum lag 30 kilometer ten westen van de plaats Taupo, midden op het Nieuw-Zeelandse Noordereiland.

De beving vond 's middags om 15.36 uur plaats en was in een groot deel van het land te voelen. Er zijn vooralsnog geen berichten van schade. GNS, het geologisch bureau van de overheid, lokaliseert de aardbeving op 150 km diepte. Volgens het bureau doen bevingen van deze omvang zich op grote diepte elk jaar wel een paar maal voor in hetzelfde gebied.

quote:

Lokon Volcano status to highest alert
JAKARTA, July 11 (AP) - (Kyodo)—Indonesian authorities have increased the alert status of a volcano to the highest level following a series of eruptions and tremors over the weekend.

Surono, head of the Center for Volcanology and Geological Hazard Agency, said in a press statement Monday the top alert status of Mt. Lokon was declared at 10 p.m. Sunday following its increased activities with 20 eruptions and some volcanic earthquakes.

The 1,580-meter volcano is near the town of Tomohon in North Sulawesi Province, about 2,200 kilometers northeast of Jakarta. It is one of the most active volcanoes on Sulawesi Island.

No activities are allowed within 3.5 km from the center of eruption, Surono said.

Meanwhile, Sutopo Purwo Nugroho, head of the National Disaster Mitigation Agency, warned villagers living on the slopes of the volcano to be on the alert for a possible major eruption.

The last fatal eruption of Mt. Lokon was in 1991 when a Swiss woman is believed to have died as a result of being trapped by lava when the volcano erupted.

Her remains are yet to be discovered.

quote:

Lokon vulkaan krijgt alarmfase rood
TOMOHON - De status van de Lokon vulkaan bij de stad Tomohon in Noord Sulawesi is vanochtend officieel verhoogd naar de hoogste status mogelijk, een status 4, of 'bezig met uitbarsten'. Zeker twee onderdistricten worden geëvacueerd.

Tot de verhoogde alarm-status van de vulkaan is besloten omdat de vulkaan al meer dan een week een verhoogde activiteit laat zien. Er zijn aanwijzingen dat magma in de buik van de vulkaan zich een weg omhoog aan het banen is.

Het hoofd van het Team Noodsituaties voor de Lokon vulkaan, Hendra Gunawan, liet weten dat de karakter-eigenschappen van de vulkaan uniek zijn. De activiteit van de vulkaan kan namelijk erg snel toenemen of afnemen. Daarom is uit voorzorg besloten de status van de vulkaan te verhogen.

quote:

Op maandag 11 juli 2011 13:22 schreef Frutsel het volgende:

[..]

quote:

Lokon uitbarsting zorgt voor evacuaties en vertragingen
JAKARTA - De Lokon vulkaan in het uiterste noorden van het eiland Sulawesi in Indonesië is maandag tot uitbarsting gekomen. Dit meldden functionarissen in de buurt van de vulkaan. Er is ook een waarschuwing uitgegaan voor het luchtverkeer.

Het Indonesische ministerie van Transport heeft via woordvoerder Bambang S. Ervan laten weten dat de vulkanische aswolk tot een hoogte van 15 kilometer reikt na de meest recente uitbarsting. Ervan deed ook een waarschuwing uitgaan voor het luchtverkeer om het gebied te mijden en eventueel extra voorzorgsmaatregelen te nemen.

In het 'Notice to Airman', laat het ministerie van Transport weten dat er een gevarenzone van zo'n 18,5 kilometer (10 nautische mijlen) is ingesteld rond de vulkaan. Lokale autoriteiten zijn inmiddels bezig om de naar schatting 7.000 inwoners op de hellingen van de vulkaan te evacueren.

Inwoners werd op maandagavond al geadviseerd om zich te evacueren op advies van het Nationaal Agentschap Mitigatie Rampen. Toen werd de gevarenzone op slechts 3.5 kilometer gezet. Sutopo Nugroho van het agentschap riep toen bewoners op het gebied te verlaten omdat er verdere uitbarstingen vergezeld van lavastromen en asregens te verwachten waren.

Gisteren ochtend werd in alle vroegte de alarm-status van de vulkaan verhoogd naar een status 4, het hoogste niveau. Sinds 00:40 lokale gisteren tijd spuwt de vulkaan een variable hoeveelheid as uit. Om 15:50 lokale tijd volgde een uitbarsting waarbij dikke bruine as werd uitgestoten door de vulkaan, aldus Farid Ruskanda Bina van de observatiepost voor de vulkaan.

Volgens Bina gaat het om een grote uitbarsting van de vulkaan. Sutopo riep mensen in het gebied op vooral kalm te blijven, zich te laten evacueren en niet in te gaan op geruchten. De Lokon vulkaan ligt op zo'n 20 kilometer afstand van de stad Manado, de tweede grootste stad op et eiland Sulawesi. De laatste aswolken van de vulkaan worden in de richting van de stad Manado geduwd.

quote:

Meer dan 2000 geëvacueerd rondom Lokon
JAKARTA - Meer dan 2.000 mensen zijn ge-evacueerd nadat de Lokon vulkaan in het noordelijke puntje van Sulawesi tot uitbarsting is gekomen. Dit meldden functionarissen woensdag.

Het hoofd van het Agentschap Beheersing Rampen BPBD, Hoyke Makarawung, liet aan Antara weten dat er inmiddels 2.116 mensen van de hellingen van de vulkaan waren geevacueerd. Alle evacuees zijn naar dorpen in de directe omgeving gebracht, nog in het district Noord Tomohon.

Er zijn vier noodverblijven ingericht in drie christelijke scholen in Tomohon. De coordinerend minister van Welzijn, Agung Laksono, liet weten dat de evacuees in goede toestand waren. De Lokon vulkaan barstte maandag uit, waardoor er onder meer een veiligheidszone van 10 nautische mijlen (zo'n 18,5 kilometer) werd ingesteld rond de vulkaan.

Eerder op maandag werd de alarm-status van de vulkaan plotseling verhoogd naar de hoogste status omdat de 1.500 meter hoge Lokon vulkaan bekend staat om zijn plotseling toenemende en afnemende activiteit. De vulkaan begon om 15:50 uit te barsten, waarbij een dikke bruinige aswolk tot zeker 15 kilometer hoog de lucht in werd gestuurd.