Seismic unrest reported at Iceland and Philippine volcanoes

September 23, 2011MANILATaal Volcano showed signs of activity as state volcanologists recorded seven quakes there in the last 24 hours. In its Friday update, the Philippine Institute of Volcanology and Seismology (Phivolcs) said two of the quakes occurred Thursday night. “Two of these events which occurred at 6:34 p.m. and 7:30 p.m. (Thursday) were felt at Intensity II by residents in Barangay Calauit in the southeastern part of the Volcano Island,” it said. Phivolcs had recorded only one volcanic quake in the area in the previous 24 hours. But Phivolcs maintained Alert Level 1 remains in effect over Taal Volcano. “This means that hazardous eruption is not imminent. The public, however, is reminded that the Main Crater should be strictly off-limits because sudden steam explosions may occur and high concentrations of toxic gases may accumulate,” it said. It added the northern portion of the Main Crater rim, in the vicinity of Daang Kastila Trail, may also become hazardous when steam emission along existing fissures suddenly increases. Also, it reminded the public that the entire Volcano Island is a Permanent Danger Zone (PDZ), and permanent settlement in the island is strongly not recommended. Phivolcs, meanwhile, said three volcanic quakes were recorded at Bulusan Volcano in Sorsogon in the last 24 hours. Wispy to weak steaming was observed on the summit crater and thermal vents known, it added. Alert Level 1 remains over Bulusan Volcano, meaning current volcanic activity is driven by shallow, hydrothermal processes. –GMA
Katla rumbles: An earthquake measuring just below three points on the Richter scale was picked up by sensors north of Godabunga in Mýrdalsjökull glacier in south Iceland, which covers the volcano Katla, at 6:57 this morning. A smaller aftershock was registered three minutes later but no further seismic activity has occurred in the glacier since. There has been considerable activity in the area this summer and the quakes this morning are considered part of this continued unrest. However, it is not possible to confirm whether the last tremors may lead to something bigger. Katla is under close observation and the inhabitants of Vík are prepared to evacuate in case of glacial flooding. –Iceland Review
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8 Responses to Seismic unrest reported at Iceland and Philippine volcanoes

  1. luisport says:

    New earthquake swarm in Katla volcano
    Posted on September 21, 2011 by Jón Frímann
    After few quiet days in Katla volcano. It seems that new earthquake swarm is about to start in it. But this earthquake swarm did start with a ML2.8 earthquake (automatic size) at 10:55 UTC. This earthquake have been followed by smaller earthquakes. So far there have not been many earthquakes in this earthquake swarm. But the largest earthquake took place on what I think is the fissure where the eruption in the year 1918 took place.
    The largest earthquake clearly has magma signature in my opinion. As it can be seen on my geophone recording of this earthquake.
    High resolution of the Katla volcano ML2.8 earthquake. The bump later on this earthquake trace is the second earthquake that only had the size ML0.9 according to the automatic size estimate. This picture is released under Creative Commons Licence. Please see licence web page for more details.

    There seems to have been some type of tremor event on Goðabunga SIL station just before the earthquake. I am not sure what event this was. But it does not appear on other SIL stations around Katla volcano.

    Earthquakes in Katla volcano, strong sulphur smell in Múlakvísl river before the earthquake happened
    Posted on September 23, 2011 by Jón Frímann
    This morning there has been some earthquake activity in Katla volcano. But it has also been reported in the news this morning that a really strong sulphur smell was found around 06:00 UTC on nearby farm to Múlakvísl river this morning. But this was before the earthquake did happen. I am not sure if this sulphur smell continues to be felt in the area close to Katla volcano. No changes in water hight has been detected in Múlakvísl glacier river.

    Update 1: According the news on Rúv this activity suggests that hydrothermal activity is continuing to increase in Katla volcano caldera. But the news also says that this activity is something like that did happen from the year 2002 to the year 2004, when hydrothermal activity did increase before it started to get lower again. It is also pointed out my Matthew Roberts that Múlakvísl glacier river is sensitive to changes in Mýrdalsjökull glacier and small floods can happen without any warning in it due to increased hydrothermal activity.

    http://www.jonfr.com/volcano/?p=1508&cpage=1#comment-21065

    Like

  2. George says:

    Also from Turkey a 5.6 …22-09-2011…… From the villages near the epicenter are reports of a lot of houses with cracks, but as far as we could see now, no collapsed houses and no injuries. Closest villages to the epicenter are : Balkaya, Giiuventepe, Ardicly, Distas, Karaca and Gulbahce.
    Magnitude : 5.6Ml (KOERI), 5.5Mw (USGS)
    UTC Time : 03:22:36 UTC
    Local time at epicenter : 06:22:36
    Depth (Hypocenter) : 4.5km
    Geo-location(s) :
    Very close to Balkaye (4 km).
    70 km (43 miles) W of Erzincan, Turkey
    123 km (76 miles) NNW of Elazig, Turkey

    Like

    • Desilk says:

      It’s at Hengill – they are pumping highly carbonated water into the rock. Similar to fracking but at much higher pressure. Not sure whether it’s clever given the hightened seismicity across the region.

      http://www.jonfr.com/volcano/?p=1514
      (It’s an interesting blog to follow if you are interested in Iceland’s volcanoes. Some highly knowledgeable people in the comments sections)

      Personally, I’m keeping my eyes on Katla.

      Like

  3. c/o Luisport

    Update 1: According the news on Rúv this activity suggests that hydrothermal activity is continuing to increase in Katla volcano caldera. But the news also says that this activity is something like that did happen from the year 2002 to the year 2004, when hydrothermal activity did increase before it started to get lower again. It is also pointed out my Matthew Roberts that Múlakvísl glacier river is sensitive to changes in Mýrdalsjökull glacier and small floods can happen without any warning in it due to increased hydrothermal activity.

    Like

  4. c/o Luisport

    Earthquakes in Katla volcano, strong sulphur smell in Múlakvísl river before the earthquake happened
    Posted on September 23, 2011 by Jón Frímann

    This morning there has been some earthquake activity in Katla volcano. But it has also been reported in the news this morning that a really strong sulphur smell was found around 06:00 UTC on nearby farm to Múlakvísl river this morning. But this was before the earthquake did happen. I am not sure if this sulphur smell continues to be felt in the area close to Katla volcano. No changes in water hight has been detected in Múlakvísl glacier river.

    http://www.jonfr.com/volcano/?p=1508&cpage=1#comment-21065

    Like

  5. luisport says:

    another one: Saturday
    24.09.2011 02:49:18 64.637 -16.718 1.2 km 3.5 90.08 4.7 km W of Kverkfjöll

    Like

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