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. Continue reading “Earthquake with magnitude Mw3,6 in Grímsfjall volcano, no eruption yet”
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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It was announced today (24-November-2021) that Grímsvötn lake in Grímsfjall volcano is about to start. It is going to take the glacier flood few hours to days to get to the glacier rivers that flow south of Vatnajökull glacier.
This also risks an eruption starting in Grímsfjall volcano. If that actually happens remains to be seen. Last glacier flood in Grímsvötn lake was in 2018, but that did not result in a eruption.
Yesterday (29-January-2021) at 23:34 UTC an earthquake with magnitude of Mw2,4 took place in Grímsfjall volcano (Grímsvötn). There where few smaller earthquakes before and after this largest earthquake. There where no signs of change in harmonic tremor following this earthquake activity.
It has also been reported in the news that glacier plate that is on top of Grímsfjall volcano is now the highest since 1996. Inflation is now taking place in eastern part of Grímsfjall volcano, in a location called Eystri Svíahnúkur. Magma pressure is today (30-January-2021) equal or higher than when the May 2011 eruption took place in Grímsfjall volcano.
Today (30-September-2020) Icelandic Met Office moved Grímsfjall volcano to a yellow warning status for air traffic. This strongly suggests that Icelandic Met Office thinks that an eruption might happen in next few days to weeks. It is expected that an eruption might happen if a glacier flood happens from Grímsvötn glacier lake that is inside Grímsfjall volcano caldera.
Current status of Grímsfjöll volcano is yellow. Copyright of this image belongs to Icelandic Met Office.
It is difficult to know if this is going to be a large or small eruption until it happens. Best thing to do right now is to keep monitoring Grímsfjall volcano activity to see if anything is going on. Currently everything is quiet.
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It was reported yesterday (10-June-2020) in the news at Stöð 2 (Channel 2) that hydrothermal activity and gas output from Grímsfjall volcano has been increasing in recent months. This has been followed by increased earthquake activity in Grímsfjall volcano. There is now a risk of an eruption following a glacier flood from Grímsvötn lake but according to the Vísir news the lake is getting close to full or at the point where it can flood and empty the crater. That can start an eruption because of the pressure drop of the magma.
Seismic energy released by earthquakes in Grímsfjall volcano since last eruption in May 2011. Copyright of this image belongs to Icelandic Met Office.
It is expected by experts that next eruption in Grímsfjall volcano is going to be a normal eruption but the eruption in May 2011 was the largest eruption in Grímsfjall volcano in 138 years. Since last eruption of this size took place in the year 1873 and then it took 10 years before next eruption took place.
There has also been a minor increase in earthquake activity in Þórðarhryrna volcano but because of lack of data it is difficult to know what that means. Last eruption in Þórðarhyrna volcano ended in January 12, 1904. It erupted at same time as Grímsfjall volcano according to historical documentation.
Sorry for the late article. I’ve been busy in other project that involves taking a lot picture and putting them up on my Instagram that can be found here.
Two earthquake swarms have appeared that I am now keeping an eye out for. This is earthquake activity in Grímsvötn (Grímsfjöll) volcano and then in Þórðarhyrna volcano (Thordarhyrna). Last time Þórðarhyrna erupted was in the year 1902 and that was at the same time an eruption took place in Grímsvötn volcano. Over the last few months there has been increase in earthquake activity in Þórðarhyrna and Grímsvötn volcanoes. Its not completely symmetrical increase in earthquakes, but close to it as of writing of this article. Last time Þórðarhyrna erupted without an eruption in Grímsvötn volcano was in the year 1887 (15th August) to 1889 (?).
Earthquake activity in Grímsvötn and Þórðarhyrna volcanoes. Copyright of this image belongs to Icelandic Met Office.
It is going to be a serious problem if an eruption happens in Þórðarhyrna volcano because that volcano is completely covered with a glacier that is up to 200 meters thick or thicker. Other risk factor is that Grímsvötn volcano might erupt outside of the caldera resulting in glacier floods and other problems.
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During the night of 3-December-2018 earthquake activity started in Þórðarhyrna volcano (no GVP profile, under Grímsvötn volcano profile). Largest earthquake in this swarm had a magnitude of 2,1 and second largest earthquake had a magnitude of 2,0.
Þórðarhyrna volcano is located south-west of Grímsvötn volcano. Yellow dots on this image. Copyright of this image belongs to Icelandic Met Office.
Last eruption in Þórðarhyrna volcano was in the year 1902 December to 1904 12-January and was a VEI=4 eruption. An eruption happened in Grímsvötn volcano at the same time.
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