[ACTUEEL] Vulkanen IJsland #18: Verhoogde activiteit bij Bardarbunga

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New earthquake swarm at Katla volcano

Katla volcano did have an new earthquake swarm during the night. This earthquake swarm had around 30 or so earthquakes. Most of them where located almost in the central caldrea. This type of swarm activity has now been ongoing since end of April, when it started rather sharply with an earthquake swarm. Since then it has had many earthquake swarm. But the current rate of earthquake swarm is around 1 to 3 earthquake swarm pr. Week. Normally they are in an new area inside the Katla volcano caldera.

My geophone station at Skeiðflöt records most of the earthquakes if the background noise is not too high during that time.

So far. This is just normal earthquake activity. It does not signal any chance of eruption activity so far. But this earthquake pattern is interesting. What it means is a different matter. So far, nobody knows for sure at this point in time. This activity seems to change hydrothermal activity inside Katla volcano caldera. This has also created minor glacier floods from Katla volcano caldera. But the flood have been seen on instruments that record water conditions in Múlakvíls glacier river. Glacier floods are marked by higher conductivity of the water, darker color and stronger sulfur smell (rotten egg smell). What happens next in Katla volcano is anyone guess. As Katla volcano has proven to be unpredictable volcano.

Small glacier flood from Mýrdalsjökull glacier (Katla volcano)
Posted by Jón Frímann

According to Rúv News this evening. A small glacier flood started flowing from Mýrdalsjökull glacier (Katla volcano) few days ago. According to local farmer in the area. Glacier floods like this are common and several have taken place during this summer, none of them have created damage. The current glacier flood is from a glacier river called Leirá river. This glacier flood is from an cauldron somewhere close to middle of Mýrdalsjökull glacier. There is small risk of damage to local roads and fiber optics cable in the area. Some glacier breakage has been reported in the glacier where the floods comes from.

I am going to update this blog post if anything major happens with this glacier flood.

Update 1: It now appears that this glacier flood is now appearing on Rjúpnafell SIL station. So far just on this only SIL station. But that might change at any time if this glacier flood grows in size.

4.5 ten noorden van IJsland.

Stukje van Jon Frimann

Yesterday (16.09.2012) an earthquake swarm did start in TFZ (Tjörnes Fracture Zone). The largest earthquakes in this swarm so far got the magnitude of 3.1 that took place at 11:07. The second earthquake took place at 14:13 UTC and had the magnitude of 3.4. This earthquake activity is located in an non-volcanic area. So this is nothing but tectonic activity. It is difficult to know for how long this activity is going to last. But it can be anything from two days and up to several days.

http://www.jonfr.com/volcano/

Gaat lekker door daar!

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Heavy earthquake activity in TFZ, Northern Iceland

At the moment there is heavy earthquake activity taking place in TFZ. With earthquakes taking place every second. Strong earthquakes taking place every 2 to 10 minutes. One earthquake has at least reached the magnitude 5.0 and more earthquake with that magnitude is currently taking place on TFZ.

This earthquake activity can be monitored live (5. min, delay) on my geophone network web page here. I am going to post more information when I have more details.

Update 1: According to USGS the largest earthquake had the magnitude of M4.8. I do not know if this is reviewed data or not. USGS data can be viewed here.

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Large amount of stress in Tjörnes fracture zone
Posted on October 24, 2012 by Jón Frímann

According to a news by Icelandic Meteorological Office. There is enough stress in the Tjörnes Fracture Zone for magnitude 6.8 earthquake. This is based on a study (Metzger o.fl., 2011). When and where this stress, or if it is going to be released in one 6.8 magnitude earthquake is impossible to know for sure. As it is impossible to predict behavior of this type of earthquake activity.

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Op woensdag 24 oktober 2012 09:10 schreef Frutsel het volgende:

[..]

dat zeggen ze maar om niet in Italië veroordeeld te kunnen worden

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Op woensdag 24 oktober 2012 09:30 schreef Jumparound het volgende:

[..]

dat zeggen ze maar om niet in Italië veroordeeld te kunnen worden

Nieuwe update van Frimann

http://www.jonfr.com/volcano/?p=3158

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Uncertainty level has been declared in north Iceland due to risk of large earthquake taking place in TFZ. This is done after consulting scientists that have been monitoring this area for the past few days since the earthquake swarm started in TFZ. It is still impossible to know when a large earthquake might take place in TFZ. But the earthquake swarm is still ongoing with little change.

Bron

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Earthquake activity has renewed at TFZ.
The area that is activate is the same area that had earthquake swarm from about 1 month ago. But largest earthquake in that swarm was a Mb5.6 earthquake. The largest earthquake today was a magnitude ML3.3 earthquake at 12:12 UTC. A magnitude 2.8 earthquake did take place at 13:08 UTC.

The risk of large earthquake in this area still high. When it might happen is impossible to know for sure. There have been reports of the largest earthquake being felt in the town of Siglufjörður and other nearby areas. I fully expect earthquake activity to continue in this area. There have been stormy conditions in Iceland for the past 24 hours. This winter storm is making it more difficult to detect smaller earthquakes in this area, as in other areas of Iceland.

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Deep earthquakes in Askja volcano

Today (26.03.2013) at 08:09 UTC there where three deep earthquakes in Askja volcano. The most depth of this earthquake swarm was 25.5 km. None of the earthquake had the magnitude above 2.5. The strongest earthquake had the magnitude 2.1 with the depth of 20.4 km

Earthquakes in Askja volcano. Askja is located to the north of Vatnajökull glacier and the lake is round in shape on this map. Marked by the orange dots on it. Copyright of this image belongs to Icelandic Meteorological Office.

This activity is part of an progress that started in Askja volcano back in the year 2010. So far this has not lead to any eruption. But it has created some odd changes. Along one was that Askja lake was ice free last year (winter 2012). The reasons for that are still not known to me.

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Uncertainty level declared on Hekla volcano

Uncertainty level has been declared on Hekla volcano due to strange earthquake activity in it for the past week or so. But in total of seven earthquakes where recorded in Hekla volcano at the depth of 11 to 12 km. This is highly unusual for Hekla volcano. People are advised against going up to Hekla volcano while uncertainty level is in force. It is also dangerous to be too close to Hekla volcano. Since if an eruption starts, it is going to start without any warning at all.

I am going to post updates on Hekla volcano as needed if anything happens.

Bron

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Op dinsdag 26 maart 2013 21:08 schreef Frutsel het volgende:

[..]

[..]

Bron

Ik moest Askja toch ff googlen... Maar gevonden. Dat kleine meertje ten noorden van de grote ijsvlakte en de "bekende" vulkanen.

https://maps.google.nl/ma(...)6.75&om=1&z=12&hl=nl

Flinke zwerm aan de gang ten noorden van IJsland



Zwaarste volgens mij nu 4.7

Laatste 12 uur... bizar zeg

Dat is flink veel inderdaad

Geen activiteit aan het zeeoppervlak?

Of is de samenstelling van IJsland vulkanisch gezien anders dan El Hierro, en geen jacuzzi of drijvende brokken? Of is het daar gewoon te diep?

Lijkt mij dat IJsland binnenkort een stukje groter gaat worden als je de plek zo ziet.

In mijn herinnering was er een half jaar geleden op exact dezelfde plek vergelijkbare activiteit. (5+ bevingen gevolgd door dergelijke zwermen). Toen gebeude er verder weinig. Dat het nu voor de 2e keer gebeurt is wel opmerkelijk. Met IJsland weet je het nooit. Ff in de gaten houden.

This is a short blog post about the earthquake swarm in Tjörnes Fraction Zone.

The largest earthquake so far is a magnitude 5.5. The largest aftershocks so far are magnitude 4.4 that took place at 01:14 UTC and 4.7 that took place at 08:55 UTC this morning. This earthquake swarm is taking place on a complex fault area that is highly active. There is also big question what effect this earthquake swarm is going to have on other faults in the area. There is a risk that this earthquake swarm is going to start other earthquake swarms in nearby faults.

130402_1430
The earthquake activity in TFZ. Green stars are earthquakes that are larger then magnitude 3.0. Copyright of this image belongs to Icelandic Meteorological Office.

130402_1430_trace
This trace shows how dense this earthquake swarm has been. Copyright of this image belongs to Icelandic Meteorological Office.

bhrz.svd.02.04.2013.14.05.utc
The earthquake is appearing clearly on my geophone network. This is Böðvarshólar geophone station. This image is released under Creative Commons licence. Please see the CC Licence page for more details.

hkbz.svd.02.04.2013.14.05.utc
The largest earthquakes as they did appear on Heklubyggð geophone station. This image is released under Creative Commons licence. Please see the CC Licence page for more details.

There have been over 500 earthquake recorded since this earthquake swarm did start. It is impossible to know for sure when this earthquake swarm is going to stop, or if it is going to pick up again. But the earthquake swarm is already starting to shown signs of dropping activity. But that might change again if there is new larger earthquake in this area, or swarm of larger earthquake.

I am going to post update of anything major happens in this earthquake swarm. It is possible to monitor the current status of this earthquake swarm here on my geophone web page.

Bron: http://www.jonfr.com/volcano/