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At 06:48:00 UTC on the 10th of December 2023 an M1.3 earthquake occurred on the Fanad peninsula in northern Co. Donegal, Ireland. The earthquake occurred at a depth of approximately 5 km, and the epicentre was approximately 5 km east of Kerrykeel (see map below). The Irish National Seismic Network (INSN) operated by DIAS has received several reports that the earthquake was experienced by members of the public near Kerrykeel, whereby most stated that they heard a loud, thunder-like noise. The Fanad peninsula experiences regular seismic activity; the most recent earthquake to occur near Kerrykeel was M1.4 in August 2017, and the largest earthquake on the Fanad peninsula was M2.4 in January 2012.
The map below shows the location of felt reports from the public.
The event was recorded by the Irish National Seismic Network (INSN) and can be seen in the waveforms plotted below:
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.
On the 25th of July 2022 at 02:35 UTC a magnitude M0.9 earthquake occurred in northern Donegal, locating 12km northeast of Letterkenny, approximately 1 km beneath Lough Swilly. 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. Earthquakes with magnitudes up to M2.5 are commonly detected in Donegal; the most recent earthquake detected in this region was M0.6 on the 22nd of June. The largest onshore Irish earthquake recorded by the INSN was M2.5, occurring on the 26th of January 2012 on the Fanad Peninsula in 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 theÂ Irish National Seismic NetworkÂ (INSN) and can be seen in the waveforms plotted below: