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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:

2020-05-14, M0.6, Irish Sea

On the 14th of May 2020 at 03:52:54 UTC, an earthquake of magnitude M0.6 occurred in the Irish Sea. The earthquake located approximately 20km east of the Isle of Man, and occurred at a depth of 3km. The epicentre location is indicated with a red circle in the map below, black lines denote major fault zones in and around Ireland. Events of this nature are not uncommon in the Irish Sea, with several small events (M < 1.1) detected near the Isle of Man in the past 5 years.

The event was recorded by the Irish National Seismic Network (INSN) and British Geological Survey (BGS) seismometers, for seismograms see the plot below (click image to enlarge).

 

2020-04-25, M0.9, Irish Sea

On the 25th of April 2020 at 04:11:52 GMT, a magnitude M0.9 earthquake occurred in the Irish Sea approximately 15km off the English coast north of Blackpool. The epicentre location is indicated with a red circle in the map below, black lines denote major fault zones in and around Ireland. Events of this nature are not uncommon in the Irish Sea, a similar event with magnitude M1.7 occurred nearby on the 16th December 2019.

2020-02-13, M0.9, Irish Sea

A magnitude M0.9 earthquake occurred on the 13th February 2020 at 19:13:01 GMT in the Irish Sea, about 25km east of Wicklow town. The epicentre location is shown in the map below. The location is in the same area in which a magnitude M2.8 earthquake nucleated on the 14th December 2005, an event that was felt by many people along the East coast of Ireland. Black lines in the map denote major fault zones in and around Ireland.

The event was recorded by the Irish National Seismic Network (INSN) and British Geological Survey (BGS) seismometers, for seismograms see the plot below (click image to enlarge).

2020-02-05, M1.0, Irish Sea

A magnitude M1.0 earthquake occurred on the 5th February 2020 at 17:38:34 GMT in the Irish Sea, about 50km east of Arklow. The epicentre location is shown in the map below, black lines denote major fault zones in and around Ireland.

The event was recorded by the Irish National Seismic Network (INSN) and British Geological Survey (BGS) seismometers, for seismograms see the plot below (click image to enlarge).

2020-01-29, M1.0, Offshore Antrim

On the 29th January 2020 at 07:27:40 GMT a magnitude M1.0 earthquake occurred offshore Co. Antrim, Northern Ireland. The earthquake located close to the epicentres of the M0.9 earthquake, 26th January 2020 and the M1.6 earthquake, 18th of December 2019. In the map below the epicentre of the M1.0 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 British Geological Survey (BGS) seismometers, for seismograms see the plot below (click image to enlarge).

 

2020-01-26, M0.9, Offshore Antrim

On the 26th January 2020 at 22:27:19 GMT a M0.9 earthquake occurred offshore Co. Antrim, Northern Ireland. The earthquake located approximately 10km east of both Ballycastle and Rathlin Island, very close to the location of the M1.6 earthquake that occurred on the 18th of December 2019 at 20:22:14 GMT.

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

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