Today (8-December-2021) an earthquake swarm started north of Grindavík town. Largest earthquake in this swarm so far had a magnitude of Mw3,1 at 10:44. The news doesn’t say if this earthquake was felt in Grindavík. Earthquake activity has been going up recent weeks since the eruption in Fagradalsfjall ended on 18th September 2021. A swarm of smaller earthquake activity is currently ongoing in this same area at the writing of this article.
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Earthquake with magnitude Mw3,6 in Grímsfjall volcano, no eruption yet
I’ve been trying to wait for information about the activity in Grímsfjall volcano. A new cauldron was discovered yesterday (05-December-2021). It is possible that an small eruption took place in the side of Grímsfjall volcano and didn’t break the glacier. It might have been a short eruption if that is what happened. Harmonic tremor data is unclear on this so I can’t give any good answer. At 06:16 UTC an earthquake with magnitude of Mw3,6 took place. I poorly recorded it my seismometer and it seems to have been a low period earthquake. Suggesting that a magma pushing up was the reason this earthquake happened.
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Sharp change in harmonic tremor in Grímsfjall volcano
This situation is unclear and nothing has been confirmed as of writing of this article. This seems to have started about 1 hour ago and there has been a change in the harmonic tremor levels at Grímsfjall volcano. This is not yet the super sharp change I did see in May-2011 when that eruption happened. This is however is possibly a change in harmonic tremor that is consistent with magma moving inside the volcano system. Earthquake activity has been minimal in the last 24 hours.
This is a monitoring situation currently. Sometimes an eruption happens after a glacier flood or doing a glacier flood in Grímsfjall volcano. At other times however nothing happens and it is not possible to know what happens now.
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Earthquake in Vatnafjöll mountain during the night
At 03:17 UTC on 26-November-2021 an earthquake with magnitude of Mw3,5 took place in Vatnafjöll mountains that are south of Hekla volcano. This earthquake was not felt or it was not reported to Icelandic Met Office.
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Large earthquake swarm in Reykjanes volcano
Yesterday (20-November-2021) an large earthquake swarm started in Reykjanes volcano. This earthquake swarm is rather large, with 217 earthquakes recorded so far. Largest earthquake had a magnitude of Mw3,5 but other earthquakes have been smaller in magnitude.
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Ongoing earthquake swarm in Vatnafjöll mountain south of Hekla volcano
The earthquake activity south of Hekla volcano is ongoing and the largest earthquakes in recent days have had a magnitude of Mw3,8 and Mw3,3. Other earthquakes in recent days have been smaller. The largest earthquakes have been felt in nearby farms and Hvolvollur town and in Hella town.
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Earthquake activity in Brennisteinsfjölll volcano
Yesterday (18-November-2021 and on 17-November-2021) an earthquake swarm took place in Brennisteinsfjöll volcano. Two of the largest earthquakes where Mw3,3 magnitude in size.
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Strong aftershock in Vatnafjöll mountains (south of Hekla volcano)
Yesterday (13-November-2021) at 23:23 UTC an earthquake with magnitude of Mw3,4 took place in Vatnafjöll mountain south of Hekla volcano. This looks like an aftershock of the main earthquake of magnitude Mw5,2 that took place on 11-November-2021.
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Two strong earthquakes in Bárðarbunga volcano
Today (12-November-2021) at 15:16 and 15:35 two earthquakes with magnitudes of Mw3,3 and Mw3,6 took place in Bárðarbunga volcano.
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Earthquake not far from Keilir mountain this morning
Today (12-November-2021) at 05:05 UTC an earthquake with magnitude of Mw3,2 took place 3,3 km South West of Keilir mountain. This earthquake was felt up to Borgarnes town.
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