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2022-06-21, M5.9, Afghanistan

On June 21, 2022 at 20:54:36 UTC a magnitude 5.9 earthquake occurred approximately 150km south of Kabul near the border with Pakistan (see map below). EMSC reports the earthquake originated at a depth of 10 kilometers. The earthquake caused widesoread damage with at least 300 fatalities and hundreds of injured. The event was felt widely to distances of 500km from the epicentre, including parts of Pakistan and India. Strong earthquakes in eastern Afghanistan result from the India plate moving northward and colliding with the Eurasia plate causing uplift producing high mountain ranges, including the Hindu Kush and the Himalaya.

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

For more information please see the links below:

https://www.emsc-csem.org/Earthquake/earthquake.php?id=1141004

https://earthquake.usgs.gov/earthquakes/eventpage/us7000hj3u

2022-04-17, M2.5, North Atlantic

On the 17th of April 2022 at 18:48 UTC a magnitude M2.5 earthquake occurred in the North Atlantic, approximately 90km NW of Donegal, locating south of the Rockall Trough. The earthquake located with a depth of 10 km. In the map below the epicentre of the earthquake is indicated with a red marker. Major fault zones in and around Ireland are shown with black lines. The most recent detected earthquake at this location was M0.7, occurring on the 6th of March 2022. Further to the north in the Rockall Trough, earthquakes with magnitudes up to M4.0 have been detected regularly since 1980.

The event was recorded by the Irish National Seismic Network (INSN) and can be seen in the waveforms plotted below:

2022-03-21, M5.2, North Sea

On the 21st of March 2022 at 06:32 UTC a magnitude M5.2 earthquake occurred in the North Sea, approximately 205 km WNW of Bergen, Norway. The earthquake located with a depth of 10 km and was reported felt from the western parts of southern Norway. The earthquake location is indicated by the red circle in the map below. The North Sea has low to intermediate seismicity with the majority of it occurring along the Norwegian coastline. Events are generally below M3 however a similar magnitude event was recorded in the same region on the 24th January 1927.

The event was recorded by seismic stations worldwide, including stations in the Irish National Seismic Network (INSN) (see figure below). The first seismic waves originating from the North Sea earthquake arrived in Ireland ~2 minutes after the event origin.

For more information on the North Sea earthquake please see these links:

https://earthquake.usgs.gov/earthquakes/eventpage/us6000h6bi/executive

https://www.emsc-csem.org/Earthquake/earthquake.php?id=1109087

https://nnsn.geo.uib.no/nnsn/#/news

2022-03-16, M7.3, Japan

At 14:36:33 (UTC) on the 16th of March 2022 a magnitude 7.3 earthquake occurred near the east coast of Honshu Japan, 57 km east-north-east of Namie which is located in Fukushima Prefecture (see map below). The NWS Pacific Tsunami Warning Center initially issued a warning for hazardous waves along the coast of Japan but now reports the threat from this event has passed. The Tokyo Electric Power Company reports over 2 million households in nine prefectures have been left without electricity due to the earthquake.

Japans tectonic setting is complex as it is influenced by the North America plate, Pacific plate, Philippine Sea plate, and Eurasian plate. A detailed summary of the region is available from the USGS at the following link https://earthquake.usgs.gov/earthquakes/eventpage/us6000h519/region-info.

The event was recorded by seismic stations worldwide, including stations in the Irish National Seismic Network (INSN) (see figure below). The first seismic waves originating from the Japan earthquake arrived in Ireland ~15 minutes after the event origin.

For more information on the M7.3 Japan earthquake please see these links:

https://earthquake.usgs.gov/earthquakes/eventpage/us6000h519/executive?utm_medium=email&utm_source=ENS&utm_campaign=realtime

https://www.jma.go.jp/bosai/map.html#5/38.393/143.174/&elem=warn&contents=tsunami&lang=en

http://geofon.gfz-potsdam.de/eqinfo/event.php?id=gfz2022fgid

https://www.emsc-csem.org/Earthquake/earthquake.php?id=1107417

2022-03-10, M3.4, North Atlantic

On the 10th of March 2022 at 10:57 UTC a magnitude M3.4 earthquake occurred in the Porcupine Abyssal Plain in the North Atlantic. The earthquake located with a depth of 15 km and is indicated by the red circle in the map below. While earthquakes are known to occur in this region, it is not often that they are detected. As almost all seismometers are land-based, only larger magnitude events (M > 2) are seen from this region. The previous two earthquakes from this area were detected in 2020 and 2015 (M2.5 and M2.4), and the largest earthquake detected (since 1980) in the Porcupine region was M4.4, occurring on the 17th of February 1980.

The event was recorded by the Irish National Seismic Network (INSN) and can be seen in the waveforms plotted below:

2021-11-16, M3.3, Scotland

On the 16th of November 2021 at 01:44 UTC a magnitude 3.3 earthquake occurred in Western Scotland. The earthquake located with a depth of approximately 6 km and is indicated by the red circle in the map below. There have been reports of the event being felt in Scotland and Northern Ireland.

The event was recorded by the stations of the Irish National Seismic Network (INSN) and can be seen in the waveforms plotted below:

Listen to Dr Martin Möllhoff discussing this event on RTE Radio 1’s Morning Ireland show here:

https://www.rte.ie/radio/radio1/clips/22030318/

More information is available from:


https://earthquake.usgs.gov/earthquakes/eventpage/us7000fugg/executive

https://www.emsc.eu/Earthquake/earthquake.php?id=1062853

http://www.earthquakes.bgs.ac.uk/earthquakes/recent_events/20211116014340.html#page=summary

2021-07-29, M8.2, Alaska

On July 29, 2021 at 06:15 UTC (July 28, 2021 22:51 local time) a magnitude 8.2 earthquake occurred approximately 80km south of the Alaska Penninsula (see map below). The USGS report the earthquake originated at a depth of 32 kilometers. Large earthquakes are common in this region as a result of thrust faulting at shallow depth on the subduction zone interface between the Pacific plate and the North America plate.

The event was recorded by seismic stations worldwide, including stations in the Irish National Seismic Network (INSN) (see figure below). The first seismic waves originating from the Alaska earthquake arrived ~6 minutes after the event origin.

For more information please see the links below:

https://www.usgs.gov/news/magnitude-82-earthquake-alaska

https://www.emsc-csem.org/Earthquake/earthquake.php?id=1014588

2021-03-31, M2.6 & M2.3, Rockall Trough

On the 31st of March 2021 at 02:47:08 UTC (03:47:08 local time), a magnitude M2.6 earthquake occurred in the Rockall Trough near the Hebrides Terrace Seamount, approximately 210 km north-northwest of Ireland. The epicentre location is indicated with a red circle in the map below, black lines denote major fault zones in and around Ireland. The earthquake occurred at a depth of 10 km, and was preceded by a magnitude M2.3 earthquake at the same location, occurring at 00:05:02 UTC (01:05:02 local time). Although earthquake detection rates in the Rockall Trough are lower than those of the Irish Sea, several events with magnitude M>2.0 have been detected in this region, most notably from 1980, when an earthquake of magnitude M4.0 occurred near the Hebrides Terrace Seamount.

The event was recorded by the stations of the Irish National Seismic Network (INSN) and can be seen in the waveforms plotted below:

2021-03-04, M7.3, New Zealand

At 13:27 on 4th March 2021 a magnitude 7.3 earthquake occurred off the East coast of the New Zealand’s Northern Island (see map below). The Pacific Tsunami Warning Center (PTWC) immediately issued a warning for the possibility of hazardous Tsunami waves within 300 km of the earthquake epicenter along the New Zealand coast. Tsunami waves of 0.28 m were then observed on the Northeastern Cape and waves of 0.3 to 3 m have been forecast.

The event was recorded by seismic stations worldwide. The stations in the Irish Nation Seismic Network (INSN), recorded it approximately 20 minutes after it occurred (see figure below).

New Zealand is on the Eastern margin of the Australian plate and the region is prone to large events such as this (there have been 15 earthquakes with magnitude greater than 7.5 since 1900). The convergence of the Australia and Pacific plates make it one of the most seismically active areas in the world.

For more information see the following:

https://earthquake.usgs.gov/earthquakes/eventpage/us7000dffl/executive

https://www.geonet.org.nz/earthquake/2021p169083

https://www.emsc-csem.org/Earthquake/earthquake.php?id=954885


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

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