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#1 2015-02-20 14:06:20

Iceland Eruptions
From: The Netherlands
Registered: 2014-12-18
Posts: 372

New Factsheet | February 20, 2015

The volcanic eruption in Holuhraun continues, but it has diminished substantially over the last few weeks. Visual activity in the crater has decreased and the lava field is hardly increasing in size.   

  • Seismic activity in Bárðarbunga continues to diminish although it can still be considered strong. The strongest earthquake since Tuesday was measured M4.3 at 01:26 yesterday. Two other earthquakes stronger then magnitudes M3.0 were detected over the period. In total around 70 earthquakes were detected around the caldera since last Tuesday. No earthquake over M5.0 has been detected in Bárðarbunga since 8. January. A distinct pulse of earthquakes occurred yesterday between 01:25 and 02:10. Time intervals between such pulses have significantly increased from 2-4 hours in the beginning to 12-24 hours or more at the moment.

  • Around 65 earthquakes were detected in the dyke during the same period. The strongest one was measured M1.6 today at 08:24 in Dyngjujökull glacier.

  • The rate of the subsidence in Bárðarbunga caldera had decreased substantially. But that is not the whole story. Ice is subsiding into the caldera with the effect that the GPS station does not show any changes. The estimated depression of the rock foundation of the caldera, in the light of the ice subsidence, is about 5 cm per day. The flow of magma from under Bárðarbunga is believed to be 25-30 m3 per second, which is about one tenth of the flow in September last year.

  • GPS measurements near Vatnajökull glacier show continuing slow deflation towards Bárðarbunga, indicating a flow of magma from under the volcano.

  • About 7 earthquakes were detected around Askja and 15 around Herðubreið since last Tuesday. All of them smaller than M1.5.

New factsheet (PDF)

Once I was a Cow. Once I had no name.


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