Early morning of 7. January 2023 an earthquake swarm took place in Brennisteinsfjöll volcano. All of the earthquakes are small in magnitude and largest earthquake had a automatic magnitude of Mw1,0. Depth of this earthquakes is from 7 km and down to 9,5 km depth.
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Earthquake swarm in Brennisteinsfjöll volcano
Today (21-October-2022) an earthquake swarm took place in Brennisteinsfjöll volcano. Largest earthquake had a magnitude of Mw3,0 at 10:23 UTC. This earthquake swarm is possibly over, it is however difficult to be sure.
This is probably just a tectonic earthquake activity. But it is worth noting that volcano activity as has been seen in Fagradalsfjall volcano (Iceland newest volcano) is going to move east on Reykjanes peninsula. How fast and how long that change is going to happen is not known because of lack of data and written records from 700 to 900 years ago are incomplete and vague on details at best.
Strong earthquake in Brennisteinsfjöll volcano
Today (14-May-2022) at 16:56 UTC an earthquake with magnitude of Mw4,8 took place in Brennisteinsfjöll volcano. This earthquake was clearly felt in Reykjavík, Selfoss and large parts of south and south-west Iceland. Depth of this earthquake seems to be 7,8 km.
It is unclear in my personal view if this is just a normal fault earthquake that might be possibly connected to SISZ or if this is because of stress changes from all the inflation of Krýsuvík and Fagradalsfjall volcanoes. There is a chance of larger earthquake in this area following this earthquake. When that earthquake might happen is impossible to know.
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Article updated at 04:56 UTC on 15-05-2022.
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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Earthquake in Brennisteinsfjöll volcano
On 24-May-2021 at 21:36 UTC an earthquake took place in Brennisteinfjöll volcano. The magnitude of this earthquake was Mw3,6 and this earthquake was felt in Reykjavík area.
There have been few smaller earthquakes in this area since the largest earthquake, but other than that it has been quiet. This earthquake is believed to have happened because of stress changes on the Reykjanes peninsula because of the eruption in Fagradalsfjall mountain.
New information about the situation in Fagradalsfjall volcano
This is a short article about the new information published today (8-March-2021) by Icelandic Met Office and Department of Civil Protection and Emergency Management.
New measurements of the situation in Fagradalsfjall volcano show that the dyke intrusion continues to grow and as at its shallowest point at 1 km depth. Possible eruption is expected at the south end of the dyke intrusion (closest to Fagradalsfjall mountain). Earthquakes are going to happen at the south-west end of the dyke and north-east of the dyke because of the inflation the magma is creating in the area.
There are going to be quiet times between high period of activity according to the news about this activity. There is also ongoing risk of a earthquake with magnitude of Mw6,5 in Brennisteinsfjöll volcano and according to Icelandic Met Office that risk has not been reduced in recent days. Outside of the Fagradalsfjall volcano magma dyke, no magma movement has been detected in Reykjanes (Svartsengi?) volcano and in Krýsuvík volcano.
Sources (Icelandic)
Áfram má búast við að virknin á Reykjanesskaga verði kaflaskipt (Iceland, English, Polish, Almannavarnir.is)
Kvikan er á kílómetra dýpi (Rúv.is, Icelandic)
Earthquake swarm in Reykjanes volcano and deep earthquake activity in Brennisteinsfjöll volcano
Today (10-December-2020) at 00:08 an earthquake with the magnitude of Mw3,5 took place in the volcano Reykjanes. This earthquake was felt in nearby area. Since then there has been a minor earthquake swarm going on in the area of Reykjanestá.
Green star shows the earthquake activity in Reykjanes volcano. Copyright of this image belongs to Icelandic Met Office.
Brennisteinsfjöll volcano
Today (10-December-2020) an deep earthquake swarm took place in Brennisteinsfjöll volcano. All earthquakes that took place where small in magnitude but depth was from around 5km to 12 km depth. It is not known at the writing of this article if this suggests an magma movement inside Brennisteinsfjöll volcano.
Orange dots to east of Krýsuvík volcano show the activity in Brennisteinsfjöll volcano. Copyright of this image belongs to Icelandic Met Office.
I am expecting more earthquake activity in Brennisteinsfjöll volcano in next few months. It is going to take few weeks to months to see if anything more is going on there.
Earthquake activity slowly reducing since Mw5,6 earthquake yesterday (20-October-2020)
Since yesterday (20-October-2020) the earthquake activity on the Reykjanes peninsula in the volcano Reykjanes or Krýsuvík volcano has been slowly getting down after the Mw5,6 earthquake. There have been at the writing of this article 30 earthquakes with magnitude that are larger than Mw3,0 in this area, some of those earthquakes have been felt in nearby populated areas.
The earthquake activity slightly more than 1 day later on the Reykjanes peninsula. Copyright of this image belongs to Icelandic Met Office.
At the writing of this article the number of detected earthquakes in this swarm is getting close to 2000 earthquakes. The risk of stronger earthquake both west and east of the Mw5,6 earthquake that took place yesterday. Strongest possible earthquake in this part of Iceland can reach magnitude Mw6,5 to Mw6,7 depending on location and that is only east of current earthquake activity in Brennisteinsfjöll volcano area.
According to the news, the first injury because of the Mw5,6 earthquake has been reported along with damage to a viewing place in the mountain close the location of the earthquake yesterday.
Rotaðist þegar jörðin kipptist undan (mbl.is, pictures, Icelandic)
I am going to post updates soon as possible if anything more happens in this activity on Reykjanes peninsula. At the writing of this article there has not been any sign of magma movement or any sign that an eruption has taken place in this area.
Medium sized earthquake swarm in Brennisteinsfjöll volcano
Today (21-August-2017) during the night an earthquake swarm took place just east of Brennisteinsfjöll volcano. The area in question is in part inside Brennisteinsfjöll volcano fissure swarm. Part of the area is outside any known volcano. The last night earthquake swarm had some magma signature but was mostly tectonic in nature as to be expected.
The earthquake swarm as it currently appears on Icelandic Met Office earthquake map. Copyright of this image belongs to Icelandic Met Office.
Largest earthquake in this swarm had the magnitude of 2,9 and other earthquakes are smaller in magnitude. Not every earthquake has been reviewed so far due to how many earthquakes happened. Around 210 earthquakes happened in this swarm. Around 07:00 UTC the earthquake activity mostly stopped and it has been like this for several hours. It is difficult to know for sure if a new earthquake swarm is going to start in this area soon. There is nothing suggesting that an eruption is imminent, even if magma is pushing around in the ground at the moment.
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Earthquake activity in Breinnisteinsfjöll volcano
Since the weekend there has been a earthquake swarm ongoing in Breinnisteinsfjöll volcano (Wikipedia link). This earthquake swarm has not been strong in magnitude of the earthquakes happening, with largest magnitude just at 2,8 and all other earthquakes being smaller in magnitude. Close to 130 earthquakes have happened so far.
The earthquake activity in Breinnisteinsfjöll volcano. Copyright of this image belongs to Icelandic Met Office.
The signal from this earthquake swarm shows that some of the earthquakes happening are hybrid earthquakes. That means magma is creating some of them. While tectonic process is creating others. Last eruption in this volcano was in the year 1341 and I don’t have a lot of information about it. I don’t know if this is only magma that erupts or a mix eruption (magma and ash cloud). The earthquake swam is highly localized but has moved slightly to the south from the area where it started during the weekend. The earthquake swarm appears to be ongoing as is, there are however quiet period in it and currently that is what is happening.
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