Thank you Sevan for the timely updated information.

Katla

http://www.volcano.si.edu/world/volcano.cfm?vnum=1702-03=

SEP 05 :

More Seismic Activity by Katla Volcano than Usual

The rate of seismic activity in the Katla volcano below Mýrdalsjökull glacier in south Iceland has been higher than usual with minor earthquakes regularly being picked up by sensors in the area. The last series was registered on Saturday.
“The largest earthquake was 3.2 [on the Richter scale] and an equally large earthquake hit there last Thursday,” geophysicist Einar Kjartansson at the Icelandic Meteorological Office told Morgunbladid.

“We picked up ten quakes before and after the largest one in a period of approximately 20 minutes,” Kjartansson said of the series of earthquakes on Saturday.

When asked whether this is a case of magma intrusion, Kjartansson said it is hard to tell. “We don’t know but it isn’t unlikely that it has to do with intrusions.”

He also finds it hard to predict how the activity will progress; Katla has been under observation since earthquakes started hitting there regularly. However, the most likely scenario is that the activity will gradually subdue, Kjartansson concluded.

On Saturday, the Mýrdalsjökull glacial river Múlakvísl flooded again—it tore down a bridge on the Ring Road earlier this summer—but this time the flood was not as severe and was the consequence of heavy rain rather than glacial or volcanic activity.  ESA
Photo by Geir Ólafsson

http://www.icelandreview.com/icelandreview/daily_news/More_Seismic_...

SEP 05 :

Earthquake swarm deep on the Reykjanes Ridge


During the night a earthquake swarm started deep on the Reykjanes Ridge. This earthquake swarm is currently at distance of 730 to 735 km SW of Reykjavík. So it is clear that nobody is going to feel this earthquake swarm out in the deep ocean.

From this distance it is impossible to know if this is just a earthquake swarm or a volcano event. This distance also makes it close to impossible for the SIL network to locate this earthquakes with any details. But EMSC and USGS should show the largest earthquakes as they happen on the Reykjanes Ridge.

The largest earthquakes are appearing on my Hekla geophone, but just barely. Due to this large distance only long period seismometers are going to record those earthquakes properly.

Source

SEP 05 :

Seismic activity - Magnitude 6.6 eq struck N.W.of Toba supervolcano caldera

A strong, deep 6.6 magnitude earthquake struck just northwest of the Lake Toba super-volcano caldera, just after a 5.1 quake further south August 31st.. The epicenter of the earthquake was 100 km (62 miles) SW of Medan, Sumatra, Indonesia and 1409 km (875 miles) NW of JAKARTA, Java, Indonesia.

EQ details : http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc0005pd...

http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc0005m2...

SEP 06 :

Katla seismic activity continues - Growing harmonic tremor spike in Katla volcano

At this moment it seems that there is a growing harmonic tremor in Katla volcano. This harmonic tremor started today after the earthquake swarm that took place earlier today. After it stopped a spikes of small harmonic tremor spikes did start to appear. During the past few hours they have been growing in size. But it seems that the harmonic tremor drops for few moments between spikes.

From what I can tell this harmonic tremor signal is growing every few hours or so. It is possible that this is a repeat of what did happen in July. But for the moment it is too early to know that for sure at the moment. But for the moment there is no eruption about to start in Katla volcano.
When I was writing this blog post, it seems that a new earthquake swarm is about to start in Katla volcano. But the earthquake swarms in Katla volcano often start slowly with few earthquakes, but they seems to grow with time.

Source

SEP 6 :

Increased seismicity at Iceland's Katla has finally begun to show up in the mainstream media : Iceland volcano sees surge in seismic activity

A surge of small earthquakes has been reported around Iceland's Katla volcano, but scientists said Tuesday there is no immediate concern that the increased seismic activity will trigger a dangerous eruption.

Although earthquakes around Katla are common, an increase in cluster earthquakes is not.

"It's one of the most feared volcanos, so we're closely monitoring it," said Pall Einarsson of the University of Iceland. "That said, it's normal for earthquakes to be detected around Katla. What's a bit unusual is that we're seeing swarms of small earthquakes, some occurring every 10 minutes or so."

Iceland sits on a large volcanic hot spot in the Atlantic's mid-oceanic ridge. Eruptions, common throughout Iceland's history, are often triggered by seismic activity when the Earth's plates move and when magma from deep underground pushes its way to the surface.

Like earthquakes, predicting the timing of volcanic eruptions is an imprecise science.

Last year's eruption of the Eyjafjallajokull volcano forced hundreds of people to be evacuated and paralyzed international air travel for weeks because of a hovering ash cloud.

And history has shown that when Eyjafjallajokull volcano erupts, Katla — located under the massive Myrdalsjokull icecap — isn't far behind.

Katla, which threatens disastrous flooding if its ice cap melts, typically awakens every 80 years or so, and last erupted in 1918.

Activity around Katla started to increase around July but has since grown even stronger. The strongest earthquake detected so far has been a 3.0 magnitude. There also was flooding that wiped out a bridge in July.

Like people, each volcano has a different personality of sorts, says Einarsson.

"We look at the behavior, try to analyze patterns and then try to come up with an explanation," says Einarsson. "This is a bit difficult to interpret so far, but it's correct to say that it signals some sort of activity in the volcano and some sort of magna intrusions are probably taking place."

Geologists also are worried about the Hekla volcano, which unlike Katla, is not covered by a glacier and produces little seismic activity.

During the Middle Ages, Icelanders called the Hekla volcano, the country's most active, the "Gateway to Hell," believing that souls were dragged into the fire below.

"If we saw earthquakes like this in Hekla, we would immediately signal a warning sign," Einarsson said.

Another one of Iceland's volcanos proved particularly deadly in 1783.

When Laki erupted, it freed gases that turned into smog. The smog floated across the jet stream, changing weather patterns. Many died from gas poisoning in the British Isles. Crop production fell in western Europe. Famine spread.

"Everyone has their eyes on a big Katla eruption," said Andy Russell with Newcastle University's Earth Surface Processes Research Group, who travels frequently to Iceland for research. "You can never say never, but I don't think there's need for alarm right now."

Russell said past Katla eruptions have caused floods the size of the Amazon and sent boulders as big as houses tumbling down valleys and roads. Flooding occurred within 45 minutes of the eruption, he said.

Iceland is one of the few places in the world where a mid-ocean ridge actually rises above sea level. Many volcanic eruptions along the ocean basin often go undetected because they can't be easily seen.

http://www.msnbc.msn.com/id/44410235/ns/technology_and_science-scie...

http://www.cbsnews.com/stories/2011/09/06/ap/europe/main20101974.shtml

SEP 6 :

Seismic activity; Campi Flegrei caldera, W.Naples/Italy

http://hisz.rsoe.hu/alertmap/read/index.php?pageid=svolcano_index&a...

SEP 6 :

Strong harmonic tremor pulse starting in Katla volcano

Jon Frimann is noticing strong harmonic tremor at Katla, which usually accompanies magma on the move.

Read here

SEP 6 :

Earthquake swarm in Krýsuvík volcano, Indonesia

Earlier today a earthquake swarm did start in Krýsvík volcano. This earthquake appears tectonic in nature from what I can tell on my geophone. This type of earthquake swarm is common in this area in Krýsuvík volcano. It does not mean that a eruption is about to start. But this area is a rift zone and it has many earthquake swarms during the year. This is just one of them so far. It is impossible to know how large this earthquake swarm is going to be or how long it is going to last.

The first earthquake swarm did start at 15:42 UTC, the second earthquake swarm did start at 21:53 UTC. That earthquake swarm is currently ongoing with several earthquakes every 2 min or so.

The current area of activity is a lake named Kleifarvatn lake. But that lake is on top of Krísuvík volcano.



Current activity in Krýsuvík volcano. This is a tectonic earthquake activity, not volcanic. Copyright of this picture belongs to Iceland Met Office.

I think that this earthquake activity is going to continue something into the night and next few days at the longest.

http://www.jonfr.com/volcano/?p=1453

SEP 6 :

Remote Alaska volcano resumes dome building

The lava dome at a remote Alaska volcano has resumed growing, prompting officials to raise its alert level. The dome now fills the floor of the crater at Cleveland Volcano, 940 miles southwest of Anchorage. The Alaska Volcano Observatory on Tuesday raised the volcano's alert level to watch status. The threat level was dropped on Aug. 30, but raised against after a persistent thermal anomaly started Saturday. Observatory officials say in a news release that's when the lave dome likely started growing again. The dome was 262 feet in diameter on Aug. 30, but is now about 394 feet in diameter. Officials say if that continues, lava flows could start on the flanks of the volcano. The growing dome also increases the possibility — but doesn't ensure — an explosive eruption.

http://www.adn.com/2011/09/06/2052236/remote-alaska-volcano-resumes...

http://hisz.rsoe.hu/alertmap/site/?pageid=event_update_read&edi...

SEP 6 :

Indonesia’s Mount Lokon erupts four times on Tuesday

MANADO, SULAWESI (BNO NEWS) -- Indonesia's Mount Lokon erupted four times on Tuesday after increasing its volcanic activity during the past week, officials said.

Mount Lokon, which is located on the northern tip of the island of Sulawesi, had four small eruptions on Tuesday, spewing out materials between 150 and 200 meters (492 to 656 feet), Warno, an officer at the Mount Lokon and Mount Mahawu observation post at Kakaskasen village told the Antara news agency.

The first eruption took place at 7:21 a.m. local time and the fourth 2:20 p.m., producing thick white and gray smoke. According to Warno, this means water and gases are still being burned in the crater.

As of 6 p.m. local time on Tuesday, only one volcanic tremor was recorded on Tuesday, compared to Monday's two deep volcanic tremors as well as four distant tectonic quakes. The amplitude of the latest tremors ranged between 0.5 millimeters and 10 millimeters. Despite their amplitude declining compared to previous ones, Warno said magma was still being pushed upwards.

Officials at the Volcanic and Geological Disaster Mitigation Center have kept the volcano's alert status to level III, even though the geological activity has began decreasing.

Mount Lokon has shown constant volcanic activity since June, prompting authorities to raise its status to Alert on June 27 and Watch on July 10. A series of eruptions in mid-July forced at least 5,269 locals from the villages of Kinilow, Kelurahan Kinilow I and Kakaskasen 1 to evacuate the area.

While most residents returned to their homes later that month, some 222 people remain at temporary refugee camps because their homes are in Mound Lokon's red zone - 3 kilometers (1.86 miles) from its crater. After July's activity, Mount Lokon's alert level was lowered from Watch to Alert, and has remained at this level since.

On August 17, Mount Lokon began to spew volcanic ash which fell as far away as the Kinilow I village and the Tinoor areas in North Tomohon sub district, which is a short distance from Lokon's crater. And on August 28, it erupted as many as 12 times. Monitoring staff recorded 65 deep volcanic earthquakes and 93 shallow earthquakes that day.

Dozens of active volcanoes in Indonesia are part of the Pacific Ring of Fire, known for frequent earthquakes and volcanic eruptions. Next to Mount Lokon is its volcanic twin, Mount Empung, just 2.2 kilometers (1.3 miles) away.

One of Indonesia's most active volcanoes is Mount Merapi, which is located on the island of Java near Jogjakarta, the country's second-most visited area after Bali. Last year, more than 300 people were killed in a series of eruptions between October and November which also displaced over 300,000 people.

http://channel6newsonline.com/2011/09/indonesias-mount-lokon-erupts...

SEP 6 :

Mount Duokono North Halmahera erupted belching volcanic ash as high as 800 meters

Duokono mountain in North Halmahera, North Maluku, on Tuesday (6 / 9), erupted belching volcanic ash as high as 800 meters. Residents were asked to evacuate at least about two kilometers from the foot of the mountain.

Head Mount Observation Post Duokono Iwan Ahmad said, before the eruption, volcanic earthquakes occurred dozens of times every day. Nowadays the mountain is located in the District was issued a fungus Galela volcanic dust high enough so that it can be seen from Ternate. The mountain is in standby status.

Iwan adding a mountain as high as 2,300 meters above sea level last erupted in 2008. (ADI / Ulf)

VIDEO : http://tv.liputan6.com/main/read/6/1063350

http://berita.liputan6.com/read/352171/gunung-duokono-halmahera-uta...

SEP 7 :

Hawaii, Kilauea volcano - The summit lava lake rose slightly overnight at Pu`u `O`o crater

Eruptive activity persisted within Pu`u `O`o crater and at Kilauea’s summit amidst continued inflation. The summit lava lake rose slightly overnight. In the middle east rift zone, lava continued to issue from sources at the east and west edges of the Pu`u `O`o crater. Seismic tremor levels remained low. Gas emissions remained elevated from summit and rift zone vents. All erupted lava is confined to craters within Hawai`i Volcanoes National Park and poses no direct hazard to any developed areas.

The summit … (Source)

SEP 7 :

Alaska, Cleveland volcano - Remote Alaska volcano might erupt soon, experts say

Alaska's Cleveland Volcano could soon be leaking from its flanks if the lava inside continues to build up, officials at the Alaska Volcano Observatory reported.

The observatory reported that the volcano's lava dome was 262 feet in diameter on August 30 and has now expanded to 394 feet.

"The presence of the lava dome increases the possibility of an explosive eruption, but does not necessarily indicate that one will occur," the observatory said. "Short-lived explosions could produce an ash cloud that exceeds 20,000 ft above sea level."

The observatory said it did not expect air travel problems if the volcano erupted.

Because "the small lava dome in the summit crater has resumed growth and now fills the floor of the crater," the observatory is raising its alert level.

The remote volcano is in the Aleutian Islands, about 940 miles southwest of Anchorage.

Because the volcano is in such a remote area, the observatory webcam feed has experienced technical difficulties.

http://news.blogs.cnn.com/2011/09/07/remote-alaskan-volcano-might-e...

SEP 7 :

Iceland, Katla volcano - Magma on the move in Katla volcano / Increased geothermal heat and seismic activity might indicate an upcoming eruption

While the source of the harmonic tremor yesterday in Katla volcano is not immanently clear. It is has been concluded that magma is on the move inside Katla volcano. It has been suggested that the harmonic tremor yesterday in Katla volcano is a mixture of both hydrothermal activity and water flows under the glacier. But hydrothermal activity has increased in Katla volcano since July and seems to be continuing on that path for now.

The earthquake activity in Katla volcano has been growing since July, when a sharp harmonic tremor spike did take place and was followed by a glacier flood that did destroy the Múlakvísl river bridge. But that flood did peak at ~5 meter high.

Currently the activity is quiet in Katla volcano. But that might be because the earthquakes are not being detected by the bad weather that is currently in this area (and all over Iceland for the fact).
Here is a overview of the change in activity since Week 34.


Update 1: According to news the local emergency units and police have started to review the evacuation plans and emergency plans in the case of a eruption in Katla volcano.

News about that can be read here, if you risk Google Translate.
Fara yfir áætlanir um viðbrögð (mbl.is, Icelandic, 7. Sept, 2011)

RSOE - Increased geothermal heat and seismic activity below Mýrdalsjökull glacier in south Iceland, which covers the volcano Katla, might indicate an upcoming eruption and scientists are closely monitoring the volcano. However, it is not certain that an eruption is imminent. Mýrdalsjökull and Mt. Maelifell. Photo by Páll Stefánsson. Geophysicist Magnús Tumi Gudmundsson went on an observation flight over Mýrdalsjökull yesterday. “There is always uncertainty regarding Katla and therefore it was considered necessary to fly across the glacier to shed a light on what is going on,” he told Fréttabladid. He noted that calderas and cracks in the glacier clearly showed increased geothermal heat and regular series of minor earthquakes also indicate that the volcano has been expanding recently. Gudmundsson pointed out that there is only one definite indication that an eruption in Katla is coming up. “All sources of Katla eruptions in the past 500 years mention large earthquakes that can clearly be found in Mýrdalur [by Vík] a few hours before the eruption begins. That is in fact the only absolute warning.” There was some seismic activity below Mýrdalsjökull yesterday but this morning it seemed to have subsided. The glacial river Múlakvísl also flooded but the water level peaked yesterday evening and the water flow has since decreased, ruv.is reports. The calderas which caused the flood in Múlakvísl in July are unchanged but Gudmundsson said there is a new depression in the icecap to the south of them which indicate increased geothermal heat. He added there is no clear reason for yesterday’s earthquakes.....

http://hisz.rsoe.hu/alertmap/site/?pageid=event_update_read&edi...

http://www.jonfr.com/volcano/?p=1457

SEP 8 :

Iceland, Katla volcano - Iceland’s Civil Protection Department has increased its monitoring of Katla, following increased seismic activity in the surrounding area

Iceland’s Civil Protection Department has increased its monitoring of the North Atlantic island’s largest volcano, Katla, following increased seismic activity in the surrounding area, according to a statement on its Web Site. “We can’t rule out that” an eruption is under way, Magnus Tumi Gudmundsson, a geologist at the Institute of Earth Science with the University of Iceland, told national broadcaster RUV. “It’s possible that magma is gathering underneath the mountain.” Gudmundsson said it was too early to say exactly what was happening at the volcano. Three earthquakes were measured in the Katla area after 7 p.m. local time, according to Iceland’s Meteorological Office. The largest quake was about 2.0 on the Richter scale, the Met Office said. Katla had two small eruptions in 1955 and 1999, neither of which managed to break the ice covering its 10 kilometer-wide (6 mile) caldera. The last major eruption in Katla began in 1918, when ash explosions from the crater didn’t subside for more than five weeks. Ash from Iceland’s Grimsvotn volcano forced flight cancelations in Scotland, northern England and Germany in May. An eruption of the Eyjafjallajokull volcano in April last year caused the cancellation of more than 100,000 flights on concern glass-like particles formed from lava might melt in aircraft engines and clog turbines. Historically, Eyjafjallajokull has been known to erupt one to two years prior to Katla.

http://hisz.rsoe.hu/alertmap/site/?pageid=event_update_read&edi...

SEP 9 :

More harmonic tremors in Katla volcano

It seems that Katla volcano is not as quiet it seems to be. For the moment the harmonic tremor seems to be small and only properly observable on one SIL station due to how weak it is at current time. So far two harmonic spikes have happened. This is most likely a hydrothermal system going crazy under the glacier close to Lágu Hvolar SIL station, rather then magma on the move (or at least that is what I think).

Harmonic tremor at Lágu Hvolar SIL station. The harmonic tremor can be seen at the end of this tremor plot. Copyright of this picture belongs to Iceland Met Office.

There has not been a lot of earthquake activity in Katla volcano during the last 24 hours or so. But that might not mean anything, as eruption can and have started without any warning at all (example: Grímsvötn volcano May 2011). So for now, it is more wait and see and more waiting it seems.

http://www.jonfr.com/volcano/?p=1467

SEP 9 :
Seismic activity, misc.

The following super volcanoes have had seismic activities as follows;

Whakamaru 2011-09-06 11:56:03 2.6 5 Km
Yellowstone 2011-09-06 13:18:26 2.3 2.00 Km
Campi Flegrei 2011-09-06 10:47:28 5.0 25 Km
Reporoa 2011-09-06 11:56:03 2.6 5 Km

http://hisz.rsoe.hu/alertmap/index2.php

SEP 9 :
Indonesia - Mount Tambora alert status raised to Level 3

Google Translate:
Centre for Volcanology and Geological Disaster Mitigation, issue a proclamation increasing the status of Mount Tambora in Dompu and Bima Regency West Nusa Tenggara Province from alert status to Alert Level II Level III.
In a telegram sent to the district government Dompu, numbered 667/45.03/BGV/2011 detailing letusannya famous volcanic activity with the victim during the entire history, no longer have exhaled smoke is the crater, said the Head of Active Mount Observation Post (PGA) Tambora, Abdul Haris, which is accessible from Dompu, Friday (9 / 9).

"Even though there is no exhaled smoke is the crater, but we do not disconnect status. We still continue to observe all the activity of Mount Tambora," said Abdul Haris Observation Post Mount Head On (PGA) Tambora.

It adds visual observations made ​​since the date of 30 August to 8 September 2011, all the exhaled smoke is observed craters. But on 31 August last, there were 13 earthquakes in the location of Mount Tambora.

It asks people, especially in Sub Concentrated five villages inside the foot of Mount Tambora as Country Doropeti, Concentrated, Sorinomo, Pancasila and Nangamiro to not approach the mountain.

"Line of climb for a while we are closed, as well as we reflect on people who do the activities on the slopes of Mount Tambora to undo his intention," he said.

Each activity changes of Mount Tambora on the handicapped and reported regularly to the Centre for Volcanology and Geological Disaster Mitigation in Bandung. The report also presented to the two nearest local governments that Bima and Dompu.

http://www.republika.co.id/berita/nasional/umum/11/09/09/lr8r06-sta...

Thanks Sevan.

* AUGUST 2  : Chile’s Puyehue-Cordón Caulle Continues To Spew Ash

* AUGUST 27 : Chile's Caulle volcano in Puyehue mountain erupted early this morning

Found this.

* Steady Eruption of Puyehue-Cordón Caulle

http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=51991

A mild eruption continues at Chile’s Puyehue Cordón Caulle Volcanic Complex, almost three months since activity began on June 4, 2011. This pair of natural-color satellite images shows the steadiness of Puyehue Cordón Caulle’s activity on the morning and afternoon of August 30, 2011. According to SERNAGEOMIN, the Chilean National Service of Geology and Mining, continuous tremors were associated with the emissions of gas and ash.

These images were taken by the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the Terra (morning, top) and Aqua (afternoon, bottom) satellites. The volcanic plume is pale, almost white, and streams to the northeast of the erupting vent. The small, dark area immediately beneath the plume is a fresh lava flow emplaced during the current eruption. Several lakes downwind (east) of the volcano are colored bright blue-green by fine ash suspended in the water. Some of the lakes are still partially covered by gray floating pumice.

• Reference
• SERNAGEOMIN. (2011, August 31). Reporte Especial de Actividad Volcánica No 122 Complejo Volcánico P... Accessed September 1, 2011.

NASA images courtesy Jeff Schmaltz MODIS Rapid Response Team, NASA-GSFC.

Instrument: 

Terra - MODIS

SEP 10 :

Iceland, Katla volcano - Two earthquake swarms during the night.

During the night there where two earthquake swarms in Iceland. One of this earthquake swarms was man made.

The larger earthquake swarm was in Hengill volcano and was man made. It happens and the hydrothermal plant pumps down cold water into the bedrock and changes the pressure and strain in the bedrock and nearby sediments that make up this area. The earthquakes only happens when cold water is being pumped down into the ground. When they are not pumping cold water into the ground, no earthquakes happens. Largest earthquakes in this man made earthquake swarm where ML2.5 and ML2.2 according to automatic measurements of Iceland Met Office. But most of the earthquakes where less then ML1.0 in size.
The man made earthquake swarm in Hengill volcano. Copyright of this picture belongs to Iceland Met Office.

The second earthquake swarm that did happen during the night was in Katla volcano. This earthquake swarm is no surprise to people how have been watching Katla volcano activity since July. This earthquake swarm in Katla volcano was however small during the night. But there did more earthquake activity in Katla volcano around 18:00 UTC yesterday. But overall it seems that Katla volcano has slowed down a bit compared to last few days.
Earthquakes in Katla volcano during the past 48 hours. Copyright of this picture belongs to Iceland Met Office.

For the moment it is rather quiet in Iceland, as there is currently not that much activity in Katla volcano. But that can change without any warning at all. As Iceland is highly active in both volcanoes and earthquakes.

Source

SEP 11 :

Indonesia, Mt.Tambora - Evacuation Plans Prepped as Mount Tambora Alert Level Is Raised

Provincial authorities raised the alert level of Mount Tambora to the second-highest available as observers noted an increase of volcanic activity in the volatile mountain.
“On August 30, we recorded seven volcanic earthquakes and since Sept. 8 the frequency of the quakes rose substantially, to between 12 and 16 per day,” Husnuddin, head of the West Nusa Tenggara Disaster Mitigation Agency (BPBD), told the Jakarta Globe on Sunday.
The BPBD chief said a team of observers had been immediately deployed to Mount Tambora.
The volcano, which was the site of the world’s deadliest eruption on record, showed no apparent visual signs of any upcoming eruption, but data collected on mechanical instruments gave cause for concern.
“We still hope Mount Tambora’s alert level will not increase further. We hope we can lower the status of the volcano. Let us all pray everything will return to normal,” Husnuddin said.
Abdul Haris from the Mount Tambora observatory station said the heightened alert status meant an eight-kilometer exclusion zone was being imposed.
“We fear there will be toxic gas as a direct result of the increased activity,” he said.
Husnuddin said the BPBD swiftly met with leaders of the three districts surrounding the volcano — Dompu, Bima and Sumbawa.
The agency also held talks with the leadership of Pekat and Tambora, two Dompu subdistricts near Tambora’s crater, to discuss possible evacuation plans if the alert status reaches the highest level. The agency also had identified locations for possible shelters to house people living around the volcano.
There are four villages in the two subdistricts that are about eight kilometers from the crater.
The BPBD requested several organizations be on stand-by, including the National Disaster Mitigation Agency (BNPB), the National Search and Rescue Agency (Basarnas) and the country’s Armed Forces, which have already deployed officials to several response stations in the two subdistricts.
Two main evacuation routes for people in the four villages have also been identified.
The volcano’s April 10, 1815, eruption killed more than 90,000 people, including some who died from famine and disease in the aftermath of the event. It is estimated to have had a Volcanic Explosivity Index value of seven, the only such explosion since the Hatepe eruption in New Zealand in the year 180, and only the fifth in human history.
Classified as a “supercolossal event,” Tambora’s 1815 eruption ejected immense amounts of volcanic dust into the upper atmosphere, significantly impacting the global climate for many years afterward. In Indonesia, the volcano’s roar could be heard more than 800 miles away.

http://www.thejakartaglobe.com/home/evacuation-plans-prepped-as-mou...

SEP 12 :

Seismic activity, Philippines, Taal volcano

Taal Volcano’s (14.0000°N, 120.9833°E) seismic network detected five (5) volcanic earthquakes during the past 24 hours.

http://www.phivolcs.dost.gov.ph/index.php?option=com_content&vi...

SEP 12 :

Philippines, Bulusan Volcano - Seismic activity and white steam was observed

A marked increase in seismicity of Bulusan Volcano (12.7667°N, 124.0500°E) has been indicated by eleven (11) ) volcanic earthquakes recorded by the seismic network during the past 24 hours. During cloud breaks, weak to moderate emission of white steam was observed from the southwest vents creeping upslope before drifting to the east. Steaming activity from other thermal vents varied from wispy to weak. Ground deformation survey (precise leveling) conducted last 16 - 20 August 2011 yielded no significant change at Inlagadian leveling line on the NNE flank but yielded slight inflation at Mapaso leveling line on the SSE flank, relative to the previous survey last 07-09 June 2011....

http://www.phivolcs.dost.gov.ph/index.php?option=com_content&vi...

SEP 12 :

Iceland, Earthquake swarm in Öræfajökull volcano sparks interest

(Also news about this:

http://www.icelandreview.com/icelandreview/daily_news/Is_Iceland%E2...

http://www.visir.is/skjalftahrina-i-toppgig-oraefajokuls/article/20...)

The earthquake swarm in Öræfajökull volcano three weeks ago has sparked interest among volcanologist and geologists in Iceland. As the last earthquake swarm in Öræfajökull volcano was only the third earthquake swarm to take place in the last 20 years. But this was a subject of a news from Stöð 2 (Channel 2) this evening.

While a eruption is not expected any time soon from Öræfajökull volcano. It is clear that Öræfajökull volcano has started the long (?) path to a eruption (question mark, as we all know sometimes volcanoes just skip the long waiting part and go strait to the eruption phase as a surprise to everyone).

http://www.jonfr.com/volcano/?p=1477

SEP 12 :

Indonesia, Mt.Tambora - Three areas were emptied of community activities both wood seekers and tourists.

Head of Geology and Mineral Resources Office of Mines and Energy West Nusa Tenggara Muhammaddun said, there are three disaster-prone areas in the Mount Tambora.
First, I disaster-prone areas are located in a radius of 8 kilometers. Second, disaster-prone region II at a radius of 5 kilometers. Third, disaster-prone region III in a radius of 3 kilometers.

"In the three disaster-prone areas that are not residential areas. But still discharged from community activities both wood seekers and tourists," said Muhammaddun, Mataram, Monday, September 12, 2011.

Furthermore, people living area of ​​the river either in Bima and Dompu also asked to be alert if at any time cause an increase in the frequency of the gusts of lava.

http://us.nasional.vivanews.com/news/read/246404-ada-3-kawasan-rawa...

SEP 12 :

Seismic tremors at Colombian volcanoes

...Ruiz and Machin are both on elevated alert status, but Machín is the more interesting of the two as it has likely been almost 900 years since it last erupted. The volcano is a dome complex that has produced pyroclastic flows and mudflows sourced from explosive eruptions, some of which traveled over 40 km from the domes in the ancestral caldera. There has been an increase in seismic activity - 139 earthquakes in August alone - under Machín for the past year or so (check out the webicorder), thus necessitating the increased alert status, but little else has changed. These earthquakes have been at two depths, from 1-5 km and 5-14 km below and to the southeast of the main domes. This potential activity has real ramifications in the region around Machín, such as decisions on where to build schools.

Undated image of Nevado del Ruiz, Colombia.

Over at the more famous Nevado del Ruiz (see above), seismicity has increased dramatically over the course of 2011 (the 20 year anniversary since its last eruption). During the month of August alone, almost 400 likely volcanically-related earthquakes occurred at Ruiz. Sulfur dioxide measurements are listed as "moderate" but no signs of deformation have occurred at the volcano. All that shaking means that Ruiz is also on yellow alert status, suggesting that an eruption might be in the cards. There are no webcams that I have found for Ruiz, but you can see the live webicorder traces.

These two volcanoes are located close to populated areas - Manizalez and Pereira (my mother's hometown) for Ruiz and Ibague for Machín, so they will be closely watched by INGEOMINAS for the slightest change in their activity.....

http://bigthink.com/ideas/40171

SEP 13 :
Russia, Satellite Images Highlight The Growth Of Russia’s Kizimen Volcano

A prominent lava flow descends the eastern flank of Kizimen Volcano, located  in the Kamchatka Peninsula (Russia) in this false-color satellite image acquired on September 4, 2011 (top). An image of the peak from September 6, 2009 (lower), shows the extent of the changes that have occurred since Kizimen began erupting in late 2010.
Volcanic deposits (colored brown) have covered much of the vegetation (red) on the slopes of the volcano, especially to the east. Likewise, material has filled rivers and streams around the volcano. A modest volcanic plume rises from Kizimen’s summit, accompanied by a smaller plume from a fumarole to the northwest.

These images illustrate the growth of a stratovolcano: layers of lava flows alternate with layers of “volcanic ash, cinders, blocks, and bombs.” Unlike fluid hawaiian-style lava, the flow on Kizimen is a block-lava flow, so viscous it’s almost solid. As the flow slowly advances down the east side of the volcano, the surface crumbles, sending boulders, rocks, pebbles, and other material tumbling into the valley below.

In less than a year, this rubble piled high enough to block several drainages, and a new lake was formed. Ash and fine sediment color the lake brilliant blue, in contrast to the nearly black shade of the lake in 2009. Famous stratovolcanoes include Mount St. Helens, Mount Fuji, and Popocatepetl.

These images were acquired by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) aboard the Terra satellite.
Source1 , Source2

SEP 13 :

Russia's Shiveluch volcano erupts, spews 10-km ash column


A volcano has erupted on Kamchatka Peninsula in Russia's Far East, with ash rising to an altitude of 10 km above sea level, RIA Novosti news agency reported Tuesday.

During the eruption, a crevice with a depth of about 30 meters was formed on top of the volcano. An earthquake that lasted seven minutes was also recorded, a representative from the Russian Academy of Sciences was quoted as saying.

The volcano's 10-km ash column was the highest during the past month, breaking the record of 8200 meters.

Currently there is no danger for local communities near the Shiveluch volcano, though the ashes may spread to nearby villages, the representative said.

The activities of the Shiveluch volcano, which rises 3283 meters above sea level, have increased since 2009. Since the volcano first erupted in 1980, its activities have been continuously monitored by local authorities.

There are more than 150 volcanos on the Kamchatka Peninsula, and 29 of them are active.

http://english.peopledaily.com.cn/90777/7594693.html

http://hisz.rsoe.hu/alertmap/site/?pageid=event_desc&edis_id=VE...

http://french.ruvr.ru/2011/09/12/56049958.html

SEP 14 :

Hawaii, Kilauea volcano - Lava lake level rising as inflation progressed

Eruptive activity persisted at Kilauea's summit vent, with the lava lake level rising as inflation progressed. In the middle east rift zone, lava erupting in Pu`u `O`o overflowed the east and west rims of the crater and advanced up to a few hundred meters downslope. Seismic tremor levels remained low, and gas emissions from the summit and rift zone vents remained elevated. Almost all erupted lava is confined to craters within Hawai`i Volcanoes National Park, the exception being small flows on Pu`u `O`o's east and west flanks. None of this activity poses a direct hazard to any developed areas....

http://volcanoes.usgs.gov/activity/archiveupdate.php?noticeid=6620

SEP 14 :

Russia, Kamchatka Volcano - Powerful volcanic explosions

Karymski volcano has been producing powerful strombolian to vulcanian type explosions, producing ash plumes rising to 11,500 ft (3.5 km) ASL, and showering the volcano's upper flank with bombs.

http://www.kscnet.ru/ivs/kvert/current/krm/index.html

SEP 15 :

Iceland, Katla volcano - More new tremor spikes in Katla volcano

Yesterday and today there where two tremor spikes in Katla volcano. This follows a higher then normal background noise that I cannot directly trace only to wind as I did first think.....

Source

SEP 15 :

Indonesia, Semeru volcano - 3-4 eruptions per day

An active lava dome is growing inside the crater of Semeru volcano and there are 3-4 eruptions per day, and it seems that the size and frequency is increasing in the past days according to VolcanoDiscovery research group that just got back from East Java.

Source

Image credits

SEP 16 :

Iceland, Krýsuvík volcano - Land and water levels rise

Google translate;

Earth uggandi: Next volcanic Krýsuvík? Land and water levels rise even a guest falls
From Krýsuvík. The flush figure shows how the country has risen in recent years.
Earth closely monitor the area around the neck of Structural Krýsuvík, but the country has risen about 7 centimeters over the past 16 months. Strong burst of earthquakes have been in the area. Possibly a sign of magma generation, says analyst.
Several hundred years after the last eruption in this area, but large burst of earthquakes have occurred recently that researchers have made this area more closely. GPS measurements show that the land Sveifluháls has risen about 7 centimeters since May last year, scientists currently investigating the cause.
It is possible that there is dynamic, but it is also possible that there is a gas that is causing this giant. There was a rise out in early 2009 that lasted until the autumn of that year, but then it went back,
Sigrun says Hreinsdóttir, associate professor of geophysics at the University of Iceland. She points out that continuous measurement was not initiated in the region until 2007 and it is difficult to say with certainty about these developments.
Reykjanes goes through periods of magmatic activity. It's been a break for several hundred years, and this could be a step towards a new dynamic period.
Sigrun said high seismicity in the area recently can be attributed to this combination of sketches and land plate movements. If so, is that it begins to erupt in the region believes prevail on a minor eruption would be the case.
If it would erupt Krýsuvík side, then this would probably a little soft as a means of quickly. If, however, it would erupt in Móhálsdal, we could be seeing a similar eruption in Merapi.
While this burst of earthquakes occur, the surface's no need to lower and very focused research include the question of whether these two events are connected.
Surface lowered similarly by earthquake in 2000. It is a question whether these events are now online.

Source

SEP 16 :

Seismic activity, Yellowstone caldera

http://hisz.rsoe.hu/alertmap/read/index.php?pageid=svolcano_index&a...

SEP 17 :

Seismic activity, Campi Flegrei

Source

SEP 17 :

Seismic activity, Long valley caldera

Source

SEP 18 :

Usa, Long valley caldera - Twenty-seven earthquakes in the past week

Twenty-seven earthquakes between magnitude 1.0 and 2.8 occurred in the Mammoth Lakes-Long Valley region in the past week. All the events, with the exception of one earthquake in the caldera and two in Round Valley, were located in the Sierra Nevada.

Source

SEP 18 :

Usa, Cleveland volcano - Continued growth of the lava dome

A thermal anomaly was observed in satellite data over the past day, which is consistent with continued growth of the lava dome. No ash emissions have been observed during this current eruptive episode that began in mid-July 2011. No other new reports have been received regarding the volcano.....

Source

SEP 18 :

Japan, Sakurajima volcano - Eruption with heavy static discharge lightning

SEP 19 :

Indonesia, Mt.Tambora - History’s deadliest volcano comes back to life in Indonesia, sparking panic among villagers

Bold farmers in Indonesia routinely ignore orders to evacuate the slopes of live volcanoes. But those living on Tambora have taken no chances since history’s deadliest mountain rumbled ominously to life this month.

Authorities raised a volcano alert at Tambora about two weeks ago, but even when they announced the all-clear, many villagers have refused to return home until days later.

SEP 19  :

Russia, Karymsky (Kamchatka) volcano spews ash again

The Karymsky volcano on Russia’s Kamchatka Peninsula is spewing ash 6 kilometers high into the sky, seismologists said on Monday.

The eruption has already received the orange volcanic alert status warning aircraft about the presence of ash particles in the air.

The 1,536-meter Karymsky is the most active volcano of Kamchatka’s eastern volcanic zone.

Source

SEP 20 :

Mt. Tambora fear mounts....

http://www.ecorazzi.com/2011/09/20/worlds-deadliest-volcano-missing...

http://gizmodo.com/5842066/the-deadliest-volcano-in-the-planet-is-r...

http://www.myweathertech.com/2011/09/20/residents-evacuated-as-moun...

SEP 21 :

Indonesia, Mt. Marapi - W.Sumatra volcano continues to expel smoke, dust

Mount Marapi in Tanah Datar, West Sumatra, has been spewing black smoke and volcanic dust since Wednesday morning.

Residents living near the mountain said the smoke coming out of the volcano on Wednesday was much thicker than usual.

"When the mountain spew thick black smoke, it is usually not followed by volcanic ash. The dust can be seen on clothes being dried and on leaves," resident Sinaro said Wednesday as reported by kompas.com.

A Mt. Marapi observer at the Vulcanology and Geological Mitigation Center, Warseno, said the mountain had been spewing volcanic dust mixed with sulphur from its peak.

As of Tuesday, the volcanic dust had reached heights of up to 200 meters into the atmosphere as of Tuesday and had spread across several districts and municipalities in West Sumatra.

Source

SEP 21 :

Usa, Cleveland volcano - Volcano on Alaska's remote Aleutians oozes lava

A volcano in Alaska's remote Aleutian Islands has begun oozing lava, a signal that the mountain could explode and send up an ash cloud that could threaten aircraft. Satellite images show lava is building in the crater at the summit of 5,675-foot Cleveland Mountain on an uninhabited island about 940 miles southwest of Anchorage, according to the Alaska Volcano Observatory. "It's forming a dome-shaped accumulation in the crater," said Chris Waythomas of the U.S. Geological Survey, the observatory's acting scientist in charge. "We call these things 'lava domes.' It looks like a muffin top." Lava domes form a lid on a volcano's "plumbing," including the chamber holding the magma. When they grow big enough, lava domes become unstable and will sometimes collapse, decompressing the magma chamber and leading to an explosion, Waythomas said. "They can seal up the conduit and prevent gasses from escaping and lead to an explosive event," he said. Such an explosion from of the volcano on Chuginadak Island could send an ash cloud 20,000 feet or more into the air, the observatory said. The nearest village, Nikolski, is on another island about 50 miles east and has 18 permanent residents. In previous eruptions of Cleveland Volcano, the village was not considered to be in harm's way.

"The plume would have to head directly to Nikolski to cause any problems," such as ash that could cause respiratory problems or damage engines, Waythomas said. If the village uses surface water for drinking, ash could temporarily foul it. The larger threat from ash clouds is to aircraft. Alaska's Redoubt Volcano blew on Dec. 15, 1989, and sent ash 150 miles away into the path of a KLM jet carrying 231 passengers. Its four engines flamed out. The jet dropped more than 2 miles, from 27,900 feet to 13,300 feet, before the crew was able to restart all engines and land the plane safely at Anchorage. The Federal Aviation Administration and the airline industry get concerned for trans-Pacific flights when an ash cloud has the potential to exceed the 20,000-foot threshold, as Cleveland Volcano has done in the past. "Generally anything above that altitude can be hazardous to overflying aircraft," he said. Cleveland Volcano's last major eruption was in 2001. It has had bursts of activity nearly every year since then, Waythomas said. The lava dome now measures 540 feet in diameter, up from 490 feet Sept. 9. Waythomas said a satellite image indicated the lava dome was about 65 feet below the low point on the crater rim.

"The crater is starting to fill up," he said. "This could take another week or two and it will be there. And then we're not sure what will happen." The lava flow may stop, or lava could spill over and descend the mountain's flank. "It may not do anything explosive. It may just ooze over," Waythomas said. "Or it could cause the dome itself to collapse just because it becomes unstable at that point. It's on a steep slope and there's nothing holding it up there." The observatory, a joint program between the U.S. Geological Survey, the University of Alaska Geophysical Institute and the state Division of Geological and Geophysical Surveys, was formed in response to the 1986 eruption of Mount Augustine. In announcements about Cleveland Volcano, the observatory warns that it does not have a real-time seismic network on the remote volcano and cannot track its earthquake activity, forecast imminent eruptions or even confirm explosive, ash-producing events.

Source1, Source2,

Italy, Etna volcano - 14th paroxysm of SE crater in progress

Osservatorio Etneo reported that the fourteenth eruption from Etna's New SE Crater in 2011 occurred during poor weather conditions on 19 September. Lava fountains rose from multiple vents within the crater and lava flows descended the W slope of the Valle del Bove. An ash plume drifted NE; ash and lapilli fell in an area to the N of Giarre (16 km E). The main phase of the event lasted from about 1020 until just after 1300. During the evening the lava flows were active and weak spattering continued from a vent at the SE base of the SE Crater cone....

Source

SEP 21 :

Iceland,  New earthquake swarm in Katla volcano :

Source

SEP 21 :

Hawaii, Kilauea volcano - New lava breakout at Pu’u O’o flows towards Royal Gardens

A new lava flow is advancing down the east slope of Puu Oo crater and may pose a threat to the Royal Gardens subdivision if it continues, the Hawaiian Volcano Observatory said.

Lava began overflowing the west rim of Puu Oo crater early Tuesday feeding a new lava flow moving downslope on the crater's west side.

Two lava lakes are active in Puu Oo, one on the west and the other on the east side of the crater.

Activity on Tuesday was on the west side of the crater from about 2 a.m. Tuesday until 2:25 a.m. today when lava broke through the east rim.

The new fissure fed a lava flow that advanced rapidly downslope to the east.

If the flow continues to advance, it will likely head southeast toward Royal Gardens and could reach the what's left of the subdivision in the next few days, scientists said. 

Royal Gardens has been overrun by lava several times and has no paved road access. A handful of people still live there, although much of the area is abandoned.

Lava flowed over the crater rim last week, but the flows stopped over the weekend.

The Puu Oo crater floor collapsed in early August dropping the floor level by about 245 feet. Lava broke out from the west side of the crater and advanced for several days before stopping. Lava reappeared in the crater on Aug. 21 and formed two new lava lakes that have been filling the crater ever since.

Source1, Source2

SEP 22 :

Indonesia, Alert level raised for the mudflow spewing from an underground volcano in Sidoarjo after nearby dikes nearly failed.

Authorities in East Java have raised the alert level for the mudflow spewing from an underground volcano in Sidoarjo after nearby dikes nearly failed.

The mudflow has destroyed hundreds of homes, swamped 720 hectares of land and displaced more than 11,000 people since it began erupting in late May 2006.

“The situation is alarming,” said Achmad Khusaeri, a spokesman for the Sidoarjo Mudflow Mitigation Agency (BPLS), adding that the underground volcano had begun to erupt again after lying virtually dormant for years.....

Source

Volcanic eruptions drape Kagoshima in ash

Repeated eruptions from the Sakurajima volcano have produced large amounts of ash draping the city center Sept. 15, the Kagoshima Local Meteorological Agency said. Eruptions from the volcano overlooking the city of Kagoshima began on Wednesday morning, dumping 217 grams of ash per square meter (7 ounces per 10 square feet), the third-highest level of ash to fall since records began in 1994. Volcanic ash covered much of Kagoshima's Tenmmonkan entertainment and business district on Thursday morning, visibly forming clouds as cars drove through it and many pedestrians covering their faces with towels or surgical masks to avoid breathing it in.

http://www.newsonjapan.com/html/newsdesk/article/91999.php