Since last update nothing major has changed in Holuhraun. There have been some changes in Bárðarbunga volcano it self and I am going to cover that later in this article. The magma flow from the craters in Holuhraun remains high at the moment, with latest flow measurements saying that flow of lava is now 100m³/sec. There seems to be uncertain or maybe changes in the flow of lava out of the crater. The volume is now ~1,4 km³. The lava-field has been getting thicker over the past weeks and closest to the craters it is now around 40 meters thick. New estimate of when the eruption might end are now 4 to 15 months.
Earthquake activity in Bárðarbunga volcano for the last 48 hours. Copyright of this image belongs to Icelandic Met Office.
Earthquake activity remains high, but it continues to drop at steady rate between weeks. Earthquake activity now also drops between peaks in activity. I still don’t know if a small eruption took place in Bárðarbunga volcano. Nothing has yet been confirmed and it might remain unconfirmed for a long time. I am also seeing small spikes in the harmonic tremor data due to hydrothermal activity in Bárðarbunga volcano (far as I can tell).
If anything major happens I am going to post update about it soon as I can.
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Yesterday (29-January-2015) a minor earthquake swarm took place on the Reykjanes Ridge. Total number of earthquakes was something around twenty or close to it.
The earthquake swarm on the Reykjanes ridge. Copyright of this image belongs to Icelandic Met Office.
Largest earthquakes in this swarm had magnitude of 3,2 and the second largest earthquake had the magnitude of 3,0. More earthquakes like this can possibly happen in next few days to weeks. This area often has high amount of earthquake activity.
Yesterday (29-January-2015) there was a minor earthquake swarm in small mountain named Helgafell on the Reykjanes peninsula. Largest earthquake in this swarm had the magnitude of 3,2 and was felt in Hafnarfjöður, a town closest to the source of this activity.
The minor earthquake swarm in Helgafell on Reykjanes peninsula. Copyright of this image belongs to Icelandic Met Office.
There is a chance of more earthquake activity in this area for next few days to weeks. Earthquake swarm activity is common on the Reykjanes peninsula.
It appears that at 21:22 UTC (on 29-January-2015) a possible minor eruption might have taken place somewhere along the Bárðarbunga volcano caldera rim or in it slopes. I don’t have any confirmation yet, but this is what the tremor data suggest at the moment. This minor eruption appears to have lasted around 30 – 55 minutes in total. If there was an high amount of glacier melt the glacier water is going to start appearing in Jökulsá á fjöllum or other glacier rivers that come from Vatnajökull in next 8 – 18 hours. Depending on the router the water takes. I don’t know where it is going to go, but the highest chance is that it is going to appear in Jökulsá á fjöllum glacier river. This minor eruption was followed by a minor earthquake swarm, the largest earthquake in that swarm had the magnitude of ~4,5 according to automatic results.
The earthquake activity that followed this harmonic tremor (the red dots). Copyright of this image belongs to Icelandic Met Office.
The harmonic tremor spike can be seen on Dynjuháls SIL station at the end of the blue line, where it spikes up. Copyright of this image belongs to Icelandic Met Office.
The harmonic tremor spike as it appears on the SIL station on Skrokkalda. The spike is clear based on other activity that appears clearly on this SIL station (earthquakes). Copyright of this image belongs to Icelandic Met Office.
High resolution image of the harmonic tremor on Dyngjuháls SIL station. This is the signature of eruption under the glacier. Even if it was just a small one. Copyright of this image belongs to Icelandic Met Office.
If anything more happens I am going to post update soon as possible. I am going to write about the earthquake swarm on the Reykjanes Ridge tomorrow.