Volcano and earthquake activity in Iceland
Today on 24-November-2018 a magnitude 3,3 earthquake took place in Bláfjöll area. Second largest earthquake in this swarm had a magnitude of 2,9. Other earthquakes have been smaller in magnitude.
Earthquake activity in Bláfjöll area. Copyright of this image belongs to Icelandic Met Office.
The larger earthquake was felt in Reykjavík area according to news reports. The earthquake swarm appears to be ongoing.
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Today (23-November-2018) at 21:35 UTC an earthquake with magnitude of 3,5 took place in Hamarinn volcano (No GVP, is under Bárðarbunga volcano, also known as Loki-Fögrufjöll). Last unconfirmed eruption was in July 2011 and lasted ~12 hours. It resulted in a glacier flood and did not break the glacier. That eruption was only visible on harmonic tremor measurements.
Hamarinn volcano activity (green star to the left). Copyright of this image belongs to Icelandic Met Office.
It is possible that more activity is on the way, before the eruption in 2011 there was a increase in earthquakes in Hamarinn volcano. The same pattern seems to be happening now. The July 2011 eruption started without any earthquake activity, suggesting that magma is shallow in the crust already and doesn’t need any major change in pressure to start an eruption.
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During the night of 23-November-2018 there was an magnitude 3,1 earthquake in Grímsvötn volcano (Grímsfjall). Only one aftershock appeared and it had a magnitude of 0,9.
Earthquake activity in Grímsvötn volcano (green star). Copyright of this image belongs to Icelandic Met Office.
No change happened on tremor plots following this earthquake activity. Last eruption in Grímsvötn took place in 2011.
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Today (21-November-2018) Icelandic Met Office issued a warning about strong sulphur smell from Sólheimajökull glacier and Jökulsá á Sólheimasandi (connected glacier river) that come from Katla volcano. People are advised to stay away from this area because if the sulphur smell. There hasn’t been any connected earthquake activity with this increase in sulphur smell.
Katla volcano is quiet. Copyright of this image belongs to Icelandic Met Office.
There is no earthquake activity and no change has been observed on harmonic tremor plots around Katla volcano at this moment. This is unlikely to change, since earthquake activity has been minimal in 2018.
Today (12-November-2018) at 19:21 and 19:23 UTC two earthquakes took place in Bárðarbunga volcano. The first earthquake had a magnitude of 3,6 and the second earthquake had magnitude of 3,3. Other earthquakes that have happened so far have been smaller in magnitude.
Earthquake activity in Bárðarbunga volcano. Copyright of this image belongs to Icelandic Met Office.
This earthquake activity is ongoing in Bárðarbunga volcano.
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Since yesterday (10-November-2018) and today (11-November-2018) there has been a earthquake swarm in Tjörnes Fracture Zone (TFZ). Largest earthquake in this swarm had a magnitude of 3,0. All other earthquakes have been smaller in magnitude. At this moment around 130 earthquakes have been recorded in this earthquake swarm. There are no reports of earthquakes in this swarm being felt by nearby population areas.
The earthquake swarm south of Grímsey island. Copyright of this image belongs to Icelandic Met Office.
This earthquake swarm seems be ongoing, even if it has slowed down at them moment. It is a question if it is going to continue or stop in the next few hours to days.
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During the night there was an earthquake swarm in Grímsvötn volcano. Largest earthquake in this swarm had a magnitude of 2,6 and other earthquakes were smaller in magnitude.
Earthquake activity in Grímsvötn volcano. Copyright of this image belongs to Icelandic Met Office.
Yesterday (06-November-2018) there was also earthquake activity in Grímsvötn volcano but it was at lot smaller scale then what happened during the night. At the moment there are no signs that Grímsvötn volcano are about to erupt. There has not been any more earthquake activity today.
Today (6-November-2018) there has been a minor earthquake swarm in Tjörnes Fractures Zone (TFZ). Largest earthquakes in this swarm had a magnitude of 2,7 and 2,6. Other earthquakes that have happened so far have been smaller in magnitude.
Earthquake swarm in Tjörnes Fracture Zone. Copyright of this image belongs to Icelandic Met Office.
This earthquake swarm seems to be mostly over at the moment. There is a good change it might resume at later time, if it isn’t completely over now. New earthquake swarm might also start in this same area without warning. It is impossible to know for sure what happens next in Tjörnes Fracture Zone.
Today (28-October-2018) at 10:52 UTC an earthquake with magnitude of 3,0 took place in Krýsuvík volcano and since then there has been a minor earthquake swarm happening at that location. This earthquake swarm is not part of the volcano, this looks like a tectonic earthquake swarm due to rift zone activity in this area.
The earthquake swarm in Krýsuvík volcano. Copyright of this image belongs to Icelandic Met Office.
The strongest earthquake was felt in Hafnarfjörður, Reykjavík and other nearby towns. At the moment it is unclear if this earthquake swarm is just starting or if it has already ended. It is possible that more earthquakes are going to happen in this area without warning.
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This based on news from Rúv. I am not translating the news item it self. The link is at the end of this article in Icelandic.
According to latests news on Rúv. Öræfajökull volcano continues to inflate at an increased rate. This has resulted in larger earthquakes in recent months and larger energy release in those earthquakes. Deformation has been clearly detected in Öræfajökull volcano and magma is now collecting just above 5 km depth according to measurements. Earthquake activity has increase compared to 2017 and seems to be increasing at the moment.
Rúv News
Kvika að safnast saman undir Öræfajökli (Rúv.is, Icelandic)