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2024-04-21, M5.3, Iceland

On April 21st, 2024, at 06:37:22 UTC, an earthquake measuring M5.3 struck central Iceland, at a depth of 10 km (refer to the map below for the location). The earthquake occurred near the Bárðarbunga stratovolcano, about 200km east of the capital Reykjavik. This was the largest earthquake to occur in this region of Iceland since 2015. Overall seismic activity at the volcano has been increasing since February 2024, and this earthquake could mark the beginning of a new phase of unrest at the volcano. The previous eruption of the Bárðarbunga volcano began in August 2014 and ended in February 2015.

The event was recorded by seismic stations operated by DIAS in the Irish National Seismic Network (INSN), see figure below.

For additional information, visit the following links:

https://www.emsc-csem.org/Earthquake_information/earthquake.php?id=1649429

https://earthquake.usgs.gov/earthquakes/eventpage/us7000mdlk

2023-07-09, M5.2, Iceland

On the 9th of July at 22:22:57 UTC a M5.2 earthquake occurred in the Reykjanes peninsula in southwest Iceland, at a depth of 5km (see map below; the red circle denotes the earthquake epicentre). The Icelandic Meteorological Office (IMO) reported that the earthquake was proceeded by a seismic sequence between Fagradalsfjall and Keilir caused by a magmatic intrusion just north-east of the location of the 2021 and 2022 Fagradalsfjall eruptions. According to IMO the intrusion than led to a volcanic fissure eruption that started Monday the 10th July at 16:40 local time.

An eruption in the same area in 2021 saw lava flows and fountaining for months, with hundreds of thousands of people heading to see the volcanic activity. Icelandic Civil Defence said it is dangerous to visit the current eruption area because of gas pollution and people should stay away. The eruption site is located about half way between the capital Reykjavik and the town Grindavik on the southern coast of the Reykjanes peninsula.

At time of writing the Icelandic airport authority Isavia reported that no ash has been detected in connection with the eruption and there is therefore no impact on air traffic.

The M5.2 earthquake was recorded by seismic stations operated by DIAS in the Irish National Seismic Network (INSN), see figure below.

For further information about the earthquake see:

https://www.emsc-csem.org/Earthquake_information/earthquake.php?id=1526848

https://earthquake.usgs.gov/earthquakes/eventpage/us6000kr82/executive

Information about the volcanic eruption is available at:

https://en.vedur.is/about-imo/news/earthquake-activity-in-fagradalsfjall-area

https://www.ruv.is/english/2023-07-05-eruption-begins-387050

Map from www.ruv.is, the orange area depicts the extent of the new lava flow at time of writing.

2021-02-24, M5.7, Iceland

The Reykjanes Peninsula in Iceland has suffered a series of earthquakes in the past few hours. This phenomena is known as an earthquake swarm. At the time of writing, there have been 725 quakes in the last 48 hours. The largest of which was a magnitude 5.7 that occurred at 10:05:57 on the 24th February 2021. This event was recorded by the Irish National Seismic Network and can be seen in the waveforms plotted below.

Waveforms from the magnitude 5.7 Icelandic event recorded on the 6 INSN instruments.

More information is available from the Icelandic Met Office:

https://en.vedur.is/about-imo/news/earthquake-swarm-in-reykjanes-peninsula

and on this webpage:

https://www.ruv.is/frett/2021/02/24/earthquake-alert-level-increased

present earthquake activity on the Reykjanes peninsula is shown here:

https://en.vedur.is/earthquakes-and-volcanism/earthquakes/reykjanespeninsula#view=map

Past Seismograms
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Live Seismograms
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DSB - Dublin
VAL - Kerry

Past Spectrograms
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Live Spectrograms
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ITIP - N. Tipperary
IMAY - Mayo