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2024-01-01, M7.5, Japan

On the 1st of January, 2024, a M7.5 earthquake occurred on the west coast of Japan, at a depth of 10 km (see map below). A series of aftershocks have also occurred. At the time of writing 48 deaths have been reported with major damage to roads and houses on the the west side of the island.

Japan experiences high seismic activity due to the subduction of the Pacific Plate beneath its eastern coast. However, the recent event occurred along the less seismically active western coast, where certain shallow faults accommodate broader plate movements. Shallow earthquakes, such as this one, typically lead to more pronounced surface ground shaking compared to deeper earthquakes, as the energy is released closer to the Earth’s surface.

The seismic stations of the Irish National Seismic Network (INSN), which is managed by the geophysics section in the School of Cosmic Physics at DIAS, detected the M7.5 earthquake, see figure below.

More information is available at the below resources:

https://earthquake.usgs.gov/earthquakes/eventpage/us6000m0xl/executive?utm_medium=email&utm_source=ENS&utm_campaign=realtime

https://www.data.jma.go.jp/multi/quake/quake_detail.html?eventID=20240101162429&lang=en

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

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