Home » Articles posted by David Craig

Author Archives: David Craig

2024-04-02, M7.4, Taiwan

On April 2, 2024, at 23:58:11 UTC, a powerful earthquake measuring M7.4 struck the eastern coast of Taiwan, at a depth of 35 km (refer to the map below for the location). 13 minutes later, a strong aftershock of M6.5 also occurred. This seismic activity was caused by reverse faulting near the boundary where the Philippine Sea Plate is subducting beneath the Eurasian Plate. At the time of writing, there have been 7 confirmed fatalities and numerous injuries reported. The earthquakes resulted in significant damage to buildings and widespread power outages.

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

More information is available at the below resources:

https://earthquake.usgs.gov/earthquakes/eventpage/us7000m9g4/executive

https://emsc-csem.org/Earthquake_information/earthquake.php?id=1641639

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

2023-12-18, M5.9, China

On the 18th of December 2023 at 15:59:30 UTC a M5.9 earthquake occurred in north-central China at a depth of 10km. The map below shows the earthquake epicentre (marked with a red circle). Over 100 deaths have been reported with rescue efforts ongoing.

The earthquake struck in the Gansu-Qinghai border region which is in north-central China. The Gansu province is within an intraplate region, but situated on the north-eastern margin of the tectonically active Tibetan Plateau. Seismicity in the Tibetan Plateau largely results from the continental collision of the India and Eurasia plates. Within 250 km of the Gansu province event, there have been 23 M5.5 and larger earthquakes since 1900. The largest of these was a M7.7 earthquake that occurred in May 1927 which resulted in approximately 40,000 fatalities.

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 M5.9 earthquake, see figure below.

Further information can be obtained at the following links:

https://earthquake.usgs.gov/earthquakes/eventpage/us7000ljvg/executive

https://emsc-csem.org/Earthquake_information/earthquake.php?id=1594055

2023-10-07, M6.3, Afghanistan

On the 7th of October 2023 at 07:12:50 UTC an M6.3 earthquake occurred in Afghanistan at a depth of 10km (see map below for the earthquake epicentre, marked with a red circle). The earthquake struck in western Afghanistan near the city of Herat, close the Iranian border. Media reports estimate hundreds of deaths and thousands of causalities with rescue efforts still ongoing.

Afghanistan and the Middle East are prone to earthquakes due to the interaction of several large tectonic plates (Arabia, Eurasia, India and Africa). These interactions result the region experiencing several major geological processes such as subduction, faulting, mountain formation and stretching of the Earth’s crust.

The M6.3 earthquake was recorded by seismic stations operated by DIAS in the Irish National Seismic Network (INSN), see figure below.

Further information can be obtained at the following links:

https://earthquake.usgs.gov/earthquakes/eventpage/us6000ldpm/executive?utm_medium=email&utm_source=ENS&utm_campaign=realtime

https://www.emsc-csem.org/Earthquake_information/earthquake.php?id=1563081

2023-05-06, M2.5, Donegal

At 00:32 UTC on the 6th of May 2023 an M2.5 earthquake occurred at a depth of approximately 10 km. The event occurred near Glenveagh National Park in northwest Donegal, Ireland (see map below). The Irish National Seismic Network (INSN) operated by DIAS has received reports that the event was felt throughout the Donegal area.

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

If you felt this event, please consider making a report at https://www.insn.ie/you-felt-a-seismic-event/questionnaire/

The map below shows the locations from where the INSN received felt event reports. Nearly 300 reports of the event being felt or heard were received, particularly from Letterkenny, Ballybofey and Dungloe. Approximately 85% of respondents heard the earthquake, 76% felt the earthquake and 32% were awakened by the earthquake.

The earthquake was also detected by several Raspberry Shake seismometers operated in Ireland by citizens and schools. The plot below shows the recorded data, the distance between each station and the epicentre is shown in the top right corner of each sub-panel.

Below we show the seismogram and spectrogram for the the citizen station AM.R0FF0 (located in Sligo) as generated by the Raspberry Shakenet mobile app.

2023-02-06, M7.8, M7.5, Turkey

On the 6th of February 2023 at 01:17:35 (UTC) an M7.8 earthquake occurred in South-Eastern Turkey (see map below). The event effected Turkey, Syria and surrounding areas. The earthquake struck 30 km WNW of Gaziantep, Turkey and 108 km NNW of Aleppo, Syria, both of which are densely populated areas. Several strong aftershocks have also been observed in the region, notably a magnitude M7.5 about 100km north of Gaziantep at 10:24:49 (UTC) the same day. Over five thousand deaths and many injured, largely due to building collapse, have been reported. The M7.8 and M7.5 earthquakes occurred at depths of 18km and 10km respectively. Such large, shallow earthquakes produce significant ground shaking.

For a radio interview on RTE Radio 1 titled “Why is Turkey so prone to earthquakes?” with Chris Bean, Head of Geophysics at DIAS follow this link: https://www.rte.ie/radio/radio1/clips/22208567/

Chris Bean also talked on The Pat Kenny Show on Newstalk radio, the clip can be accessed here: https://www.insn.ie/wp-content/uploads/2023/02/The-Paty-Kenny-Show-7th-Feb-2023-Chris-Bean.mp3

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

More information about the M7.8 earthquake is available at the following resources:

https://earthquake.usgs.gov/earthquakes/eventpage/us6000jllz

https://www.emsc-csem.org/Earthquake/earthquake.php?id=1218444

Information about the M7.5 earthquake is available at these sites:

https://earthquake.usgs.gov/earthquakes/eventpage/us6000jlqa

https://www.emsc-csem.org/Earthquake/earthquake.php?id=1218771

2023-01-09, M7.6, Indonesia

On the 9th of January 2023 an M7.6 earthquake occurred in the Tanimbar region of Indonesia (see map below). Several aftershocks were also reported after the powerful quake that was also felt in some parts of northern Australia.

Indonesia is positioned at the boundary of 3 tectonic plates (the Indian-Australian, Eurasian and Pacific plates). The plate boundaries are long and found beneath the ocean, meaning large and shallow earthquake can be generated from this zone that may potentially generate tsunami.

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

More information is available at the following resources:

https://www.bmkg.go.id/berita/?p=peta-isoseismal-gempabumi-maluku-tenggara-barat-10-januari-2022&lang=ID&s=detil

https://earthquake.usgs.gov/earthquakes/eventpage/us7000j36j/executive?utm_medium=email&utm_source=ENS&utm_campaign=realtime

https://www.emsc-csem.org/Earthquake/earthquake.php?id=1208699

2022-12-20, M6.4, California

On the 20th of December 2022, an M6.4 earthquake occurred in the United States of America at 10:34:24 UTC approximately 15km WSW of Ferndale, California (see map below). At least two deaths have been recorded and several injuries. The earthquake also caused damage to buildings and interrupted the power and water supply in the area.

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

More information is available at the following resources:

https://earthquake.usgs.gov/earthquakes/eventpage/nc73821036/executive

2022-11-21, M5.6, Indonesia

On the 21st of November 2022, an M5.6 earthquake occurred at 06:21:11 UTC approximately 18 km WSW of Ciranjang-hilir, Indonesia, see map below. The event occurred in a densely populated region and resulted in over 200 fatalities and over 1,000 injured people largely due to buildings collapsing.

This is a highly seismically active region, close to the subductive plate boundary between the Australia and Sunda plates. The earthquake occurred within the crust of the Sunda plate approximately 260km northeast of the boundary.

More information is available at the following resources:

https://earthquake.usgs.gov/earthquakes/eventpage/us7000ir9t/executive

https://www.bmkg.go.id/gempabumi/gempabumi-terkini.bmkg?lang=EN

https://www.emsc-csem.org/Earthquake/earthquake.php?id=1191326

2022-07-27, M7.0, Philippines

On July 27, 2022, at 00:43:24 UTC a magnitude 7.0 earthquake occurred in the island of Luzon in the Philippines. The earthquake struck approximately 84 km SSE of the city of Laoag (pop: 102,000) and 15 km NE of San Ramon (pop: 4,000), see map below. EMSC reports the earthquake originated at a depth of 10 kilometers. At the time of writing the earthquake caused at least 2 deaths and dozens of injuries have been reported.

Map showing the Philippines earthquake location.

The tectonics of the region are complex and prone to large earthquakes. Luzon is on the Philippines sea-plate which is bounded to the East and West by subduction zones. According to the USGS the region experiences high seismicity rates and since 1970, 11 other earthquakes of magnitude 6.5 or larger have occurred within 250 km of the July 27, 2022 earthquake. The largest of these earthquakes occurred in 1990 (M7.7) and killed more than 1,600 people.

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

The M7.0 Philippines earthquake as recorded by the INSN seismometers in Ireland.

More information is available at the following resources:

https://earthquake.usgs.gov/earthquakes/eventpage/us6000i5rd/region-info

https://www.emsc-csem.org/Earthquake/earthquake.php?id=1153080

Past Seismograms
follow this link

Live Seismograms
All stations here
Filtered versions here
DSB - Dublin
VAL - Kerry

Past Spectrograms
follow this link
Live Spectrograms
All stations here
ITIP - N. Tipperary
IMAY - Mayo