This earthquake swarm is around 1330 km away from Reykjavík and in the North Atlantic ocean. What is going on here is unclear, but this is probably an earthquake swarm before an eruption or during an eruption in that area. The ocean depth at this location is between 3 to 4 km so nothing is going to appear on the surface.
Total of 61 earthquakes have been recorded since 26-September-2022 when this activity started. Largest earthquake so far had a magnitude of Mw5,7 but several earthquakes with magnitude of Mw5,0 appears to have taken place. Because how remote this area is only the largest earthquakes are being recorded. It is possible to monitor the earthquake swarm here on EMSC website.
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During the night of 27-August-2022 an earthquake swarm took place close to Eldeyjarboði blind skerry. Largest earthquake had a magnitude of Mw3,1. Other earthquakes where smaller and at this distance, only earthquakes with magnitude above Mw2,2 were detected. The distance from Reykjanestá is about 80 to 90 km. Last eruption in this area was in the year or around the year 1830. Location of the earthquakes detected is not accurate because of distance from the SIL network.
What is happening at this location is unknown. This can just be normal tectonic activity or this can be earthquake activity related to volcanism at this location. It is impossible to know since the area is under ocean and unless an eruption is seen. This can be assumed to be normal tectonic earthquake activity in this area.
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Today (21-August-2022) at 15:28 UTC and 15:27 UTC two strong earthquakes took place at distance of 531 km from Reykjavík. The smaller earthquake had a magnitude of mb4,7 (EMSC information) and the larger earthquake had a magnitude of Mw5,1 (EMSC information). At 16:32 UTC an mb4,4 earthquake took place (EMSC Information).
This might be a eruption at this location or about to start. It is impossible to know for sure because of distance from the coastline and depth of ocean at this location. If an eruption happens, it is not going to be observed at all. The ocean depth at this location is 2,5 to 8 km (deepest areas).
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This is a short update on the eruption in Fagradalsfjall mountain in Merdalir valley. As expected there is not a lot of news in this eruption, since lava type of eruptions are normally not news heavy eruptions.
The amount of lava that is now erupting according to latest news is about 15m3/sec. This is higher than the eruption in Geldingadalir in 2021.
The lava seems to have filled up the valley the eruption started in. The floor seems to be about 10 to 30 meters high depending on location.
The crater has formed to some extend. The lava lake that remains there blocks the formation of a normal crater for now. This might change with time as the eruption continues.
Lava flow go both in south and north direction. The north lava flow goes into a smaller valley that was there. This is the long way out of the valley for now.
There is a risk that the lava flow is going to reach road 427 (Suðurstrandavegur) in few weeks time.
The risk of new eruption sites opening up remains high and that risk increases as the eruption goes on.
There is a swarm of small earthquakes that has been happening regularly since the start of the eruption in the dyke. It is unclear why that is happening.
I’ve been seeing what appears to be a lava fountain taking place in the eruption in the last few hours. This has not yet been confirmed, I have however observed this on the web cameras.
I think this is all. I hope the next update is going to be on Friday 19th August 2022 unless something major happens.
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On Monday (4-July-2022) an earthquake swarm started close to Geirfugladrangur on Reykjanes ridge. Largest earthquake on Monday had a magnitude of Mw3,2 and on Tuesday a magnitude Mw3,1 earthquake took place.
This earthquake activity is what seems to be increase in earthquake activity overall on Reykjanes peninsula and on the Reykjanes ridge. The ocean is deep at this location and an eruption would have to be a big one to break up to the ocean surface because of depth in the area. I don’t know how many earthquakes have happened in this area, because of more activity on Reykjanes peninsula in last few days.
Because of how old my hardware is and difficulty keeping it running. I have for now stopped recording earthquakes. This is going to be the situation until I can get new hardware. When that happens I don’t know. Raspberry Shake has few stations in Iceland. They can be viewed here. This is the hardware I am going to be using once I can afford to buy it. When that happens I don’t know.
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On Thursday 26-May-2022 at 20:11 UTC an earthquake with magnitude of Mw3,5. I think this earthquake was maybe felt in populated areas closest to the earthquake. This earthquake was out in the ocean, a good distance from land.
This earthquake possibly is part of the earthquake activity that is happening in Reykjanes peninsula and Reykjanes ridge. It is more difficult to know what is going on in the ocean, than on land.
Posts are going to get delayed for the next few days because I am moving to Denmark.
Today (23-May-2022) at 07:14 UTC an earthquake with magnitude of Mw3,5 took place north-east of Grindavík town. This earthquake was felt in Grindavík and in Reykjavík. The earthquake was located in a area that is either inflating or on the edge of area that is inflating.
According to Icelandic Met Office news, the inflation around Þorbjörn mountain since the start of this earthquake activity is currently at 45mm. I don’t know how much inflation the crust can take in this area before an eruption starts in this area. Any eruption in this area is probably going to start with few craters that shut down with time and then there is just one crater that erupts until the eruption ends.
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Today (20-May-2022) around 18:00 UTC the earthquake activity off the coast of Reykjanestá, that is part of Reykjanes volcano, increased again after few days of little earthquake activity. The earthquake swarm is ongoing and always changing so this article is going to be short because of that.
Largest earthquake so far had a magnitude of Mw3,8 and the second largest earthquake had a magnitude of Mw3,5. The Mw3,8 earthquake was felt in Grindavík and on nearby towns on Reykjanes peninsula. A Mw3,0 earthquake took place just north of Grindavík and was felt in the town.
Yesterday (18-May-2022) I forgot to write about the earthquake activity that is ongoing north of Grindavík town. This earthquake activity is either in the new dyke that has formed or ongoing path of the dyke in Svartsengi that has now reached north of Grindavík town. I don’t know what applies here. Skjálftalísa map that Icelandic Met Office has strongly suggests a second dyke, but the results are bit unclear. In the area east of Þorbjörn is a older eruption fissure, I don’t know when it erupted, but it might have been as early as 12th to 13th century.
Yesterday (18-May-2022) total of five earthquakes happened with magnitude larger than Mw3,0. Largest earthquake had a magnitude of Mw3,5. Today (19-May-2022) at the writing of this article, only one earthquake with magnitude of Mw3,0 has happened. Earthquake activity seems to be slowing down. I am not sure why that is.
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According to news today (18-May-2022) and based on recent measurements, a magma dyke has formed between Þorbjörn mountain and Eldvörp on Reykjanes peninsula. Eldvörp on Reykjanes peninsula where formed during last eruption cycle in the volcano of Reykjanes during 12th and early 13th century, exact times are poorly known. This is in a volcano named Reykjanes and is not connected to Krýsuvík-Trölladyngja volcano that erupted in 2021 (Fagradalsfjall mountain).
The dyke is shallow and narrow according the news that quote scientists from University of Iceland, Earth science department and Icelandic Met Office. The length of dyke is 7 to 9 km and depth is down to 4 to 8 km (?). This also shows up in the GPS data and other data that Icelandic Met Office has access to (I don’t have this level of access).
It is not possible to know when a eruption start or in what area. The main risk areas now are Blue Lagoon, HS hydrothermal energy thermal plant. The town of Grindavík is slightly south of this and is possibly in danger. How this goes depends on where the eruption starts and how large it is going to be. Smaller eruption is less of a problem than a big eruption in this area. All that can be done now is to continue to monitor the situation.
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