Day: November 29, 2016

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Magnitude 3,2 earthquake in Katla volcano

Today (29-November-2016) at 19:55 UTC a magnitude 3,2 earthquake took place in Katla volcano. The strongest aftershock so far had the magnitude of 2,7. No other activity has appeared in Katla volcano following this earthquake at the moment.

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The green star shows where the magnitude 3,2 earthquake took place in Katla volcano. Copyright of this image belongs to Icelandic Met Office.

Earthquakes in Katla volcano happen due to magma changes, mostly pressure changes in the magma chambers that have inflated the volcano over a long period of time. Recent increase in earthquake activity suggests that new magma is flowing into the magma chambers at shallow depth inside the caldera. That is increasing the pressure levels and the earthquake activity at the same time.

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Deep earthquakes in Bárðarbunga volcano

Over the past few hours a sequence of deep earthquakes has been taking place in Bárðarbunga volcano. The depth of those earthquakes is from 19 km and up to 11 km, how they spread out suggesting a dyke intrusion in Bárðarbunga volcano fissure swarm or on the edge of the volcano.

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The deep earthquakes taking place almost south of the main caldera in Bárðarbunga volcano (few blue/yellow dots). Copyright of this image belongs to Icelandic Met Office.

Deep earthquake activity suggests that fresh magma is pushing into the volcano at more pressure than in past few days. The clues about this happening have been the stronger earthquake activity in Bárðarbunga volcano over the past few weeks. New dykes can also form without warning and start an eruption if the pressure is enough in them, such eruption might not last long, not even a whole day in some cases.

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