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2021-02-10, M7.7, Loyalty Islands

At 13:20:00 (UTC) on the 10th February 2021, a magnitude 7.7 earthquake occurred southeast of the Loyalty Islands in the Pacific, see map below. The epicenter lies in a very remote region and only few people felt the event. The earthquake struck at a depth of 10 km and according to the Pacific Tsunami Warning Center a tsunami was triggered. Reported wave heights are 78cm in Vanuatu, 47cm at Norfolk Island, 29cm in New Caledonia and 22cm at the North Cape in New Zealand. At time of writing no fatalities or building damage were reported. The Loyalty Islands region is seismically very active, 15 other earthquakes with magnitudes larger than 7 were detected over the preceding century. This seismic activity is related to the plate boundary between the Australian and the Pacific plate.

The earthquake was recorded at seismic stations worldwide, including stations of the Irish Nation Seismic Network (INSN), see seismic waveforms below.

Further information is available from the following sources:

https://www.emsc-csem.org/Earthquake/earthquake.php?id=947612

https://earthquake.usgs.gov/earthquakes/eventpage/us6000dg77

2020-12-11, M0.6, Irish Sea

On the 11th of December 2020 at 04:13:26 GMT, a magnitude M0.6 earthquake occurred in the Irish Sea approximately 40 km from the Wicklow coast. The earthquake occurred at a depth of 1 km. The epicentre location is indicated with a red circle in the map below, black lines denote major fault zones in and around Ireland. Earthquakes regularly occur in the Irish Sea, the most recent of which was M1.3, occurring on the 17th of September 2020. The largest magnitude event recorded in the Irish Sea in recent times was the M2.5 earthquake, occurring on the 15th of December 2019.

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

2020-12-07, M0.6, Offshore Donegal

On the 7th December 2020 at 08:29:17 UTC a magnitude M0.6 earthquake occurred offshore Co. Donegal. The earthquake epicentre located approximately 12 km east of the island of Inistrahull, and 15 km northeast of the Inishowen peninsula. The earthquake occurred at a depth of 3 km. This is first time in which an event has been detected offshore northern Donegal, although several events have previously been detected offshore Antrim near Rathlin Island, and around the Scottish island of Islay. 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 event was recorded by the Irish National Seismic Network (INSN) and can be seen in the waveforms plotted below:

2020-11-26, M2.5, Porcupine Abyssal Plain, North Atlantic

On the 26th of November 2020 at 04:29:59 UTC, a magnitude M2.5 earthquake occurred in the Porcupine Abyssal Plain, locating approximately 460km west-south-west off the coast of Kerry. The earthquake occurred at a depth of 10 km. The location of the epicentre is indicated with a 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 2015 (M2.4 and M2.3), 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:

2020-09-17, M1.3, Offshore Skerries, North Dublin

On the 17th of September 2020 at 17:31:40 GMT, a magnitude M1.3 earthquake occurred in the Irish Sea approximately 2 km offshore Skerries, North Dublin. The earthquake occurred at a depth of 14 km. The epicentre location is indicated with a red circle in the map below, black lines denote major fault zones in and around Ireland. Earthquakes do occur regularly in the Irish Sea, however, it is not often that earthquakes are detected so close to Ireland’s east coast. The last detected earthquake to occur within 10 km of the east coast was the M2.4 event from the 18th of March 2013, occurring 6 km offshore Wexford.

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

2020-07-22, M7.8, Alaska Peninsula

At 06:12:44 (UTC) on the 22nd of July 2020, a magnitude 7.8 earthquake occurred  near the Alaska Peninsula (see map below). The earthquake struck approximately 100 km south of the peninsula at a depth of 30 km. Shortly after, a tsunami warning was issued by the U.S. Tsunami Warning System. Several aftershocks of magnitude 5 and greater occurred within the hours following the main shock. Large earthquakes are common in this region due to the subduction of the Pacific plate beneath the North American plate. Since 1900, twelve earthquakes with magnitudes greater than 7.5 have occurred in this region, including the 1964 M9.2 Prince William Sound earthquake, the second largest recorded earthquake in the era of modern instrumental seismology.

The earthquake was recorded at seismic stations worldwide, including stations of the Irish Nation Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).

Further information is available from the following sources:

https://www.emsc-csem.org/Earthquake/earthquake.php?id=878808

https://earthquake.usgs.gov/earthquakes/eventpage/us7000asvb/executive

2020-06-23, M7.4, Oaxaca, Mexico

At 15:29:05 (Universal Time) on the 23rd of June 2020, an earthquake of magnitude 7.4 struck in the Oaxaca region of Mexico (see map below). The earthquake occurred at a depth of 10 km, locating approximately 12 km SSW of Santa Maria Zapotitlan, Mexico. Shortly after, the Pacific Tsunami Warning Canter (PTWC) issued a warning that hazardous tsunami waves  reaching 1 to 3 m above the tide level along the coast of Mexico are possible.

Mexico is one the earths most seismically active regions due to the relative motions of three large tectonic plates (the Pacific Plate, the Cocos Plate and the North American Plate) in the region. The relatively dense oceanic crust of the pacific plate is subducting beneath the Mexican landmass. This motion can result in large earthquakes such as today’s event. The interaction of the subducting plate and the mantel rock beneath the Mexican landmass also results in volcanism in the area.

The earthquake was recorded at seismic stations worldwide, including stations of the Irish Nation Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).

Further information is available from the following sources:

https://earthquake.usgs.gov/earthquakes/eventpage/us6000ah9t/executive?utm_medium=email&utm_source=ENS&utm_campaign=realtime

https://www.emsc-csem.org/Earthquake/earthquake.php?id=870434

 

2020-06-18, M7.4, Kermadec Islands

At 12:49:53 on the 18th of June 2020, an earthquake of magnitude 7.4 struck in the Kermadec Islands region of the South Pacific (see map below). The earthquake occurred at a depth of 8 km, locating approximately 650 km northeast of New Zealand’s North Island. This region of the Tonga-Kermadec subduction zone experiences high levels of seismic activity, with nearly 20 events of M 6.5+ over the past half century within 250 km the 18th of June earthquake.

The earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).

Further information is available from the following sources:

https://www.emsc-csem.org/Earthquake/earthquake.php?id=868826

https://earthquake.usgs.gov/earthquakes/eventpage/us6000ae4n/executive

2020-06-03, M6.8, Chile

At 07:35:33 UTC (03:35:33 local time) on the 3rd of June 2020 a magnitude 6.8 earthquake struck northern Chile (see map below). The earthquake occurred at a depth of 87 km, locating approximately 200 km east of the city of Antofagasta. Chile experiences very high rates of seismic activity due to its location along the boundary of the Nazca and South American tectonic plates. In addition, the depths at which earthquakes occur in Chile varies greatly, with shallower events occurring along the coast in the west, and deeper events occurring in the east. The largest earthquake recorded in the modern era of instrumental seismology, the M9.5 Valdivia earthquake, occurred in southern Chile in 1960.

The earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).

Further information is available from the following sources:

https://www.emsc-csem.org/Earthquake/earthquake.php?id=864463

https://earthquake.usgs.gov/earthquakes/eventpage/us6000a4yi/executive

2020-05-15, M6.5, Nevada, USA

At 11:03:28.6 UTC on the 15th of May 2020 a magnitude 6.5 earthquake struck western Nevada, USA (see map below). The earthquake occurred at a depth of 10 km, locating approximately halfway between the cities of Reno and Las Vegas. The earthquake has been felt in the states of Nevada, California and Utah by members of the public. According to the United States Geological Survey (USGS), about two dozen M5+ earthquakes have occurred within 100 km of this event over the past 50 years.

The earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).

Further information is available from the following sources:

https://www.emsc-csem.org/Earthquake/earthquake.php?id=857265

https://earthquake.usgs.gov/earthquakes/eventpage/nn00725272/executive

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