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2024-07-22, M2.0, Rockall Trough

At 22:24:11 UTC on the 22nd of July 2024 an M2.0 earthquake occurred in the Rockall Trough, in the North Atlantic ocean (see green circle on map below). The event occurred at a depth of about 29km. The earthquake locates approximately 360km northwest of Donegal, at the western edge of the Rockall Trough. The earthquake epicentre locates in an area where the bathymetry (the depth of the seafloor underwater) changes from about 2000m in the Rockall Trough to 200m at the Rockall Bank. Earthquakes are regularly detected in this region, of which the largest was magnitude M4.0, occurring in April 1980.

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

2024-05-16, M1.5, Rockall Trough

At 23:39:33 UTC on the 16th of May 2024 an M1.5 earthquake occurred in the Rockall Trough, in the North Atlantic ocean (see green circle on map below). The event occurred at a depth of about 14km. The earthquake locates approximately 150km northwest of Donegal, and about 35km south of the Hebrides Terrace Seamount. Earthquakes are regularly detected in this region, of which the largest was magnitude M4.0, occurring in April 1980.

The event was recorded and located by the Irish National Seismic Network (INSN) and can be seen in the waveforms plotted below. Station ‘DGL2’ in western Donegal commenced operation on 18th April 2024, and has already recorded several local earthquakes.

2023-03-04, M3.0, Rockall Plateau

On the 4th of March 2023 at 03:45 UTC a magnitude M3.0 earthquake occurred in the Rockall Plateau in the North Atlantic, approximately 600km northwest of Donegal. The earthquake located with a depth of 10 km. 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 red lines. While earthquakes in the Rockall Trough are regularly detected by the INSN, only one previous event has been detected from the Rockall Plateau – a M3.5 earthquake from the 10th of January 2016. As the nearest land-based seismometers are 500km from the Rockall Plateau, only larger magnitude (M2.5+) events are expected to be detected from this region. Earthquakes with magnitudes up to M4 are known to occur in the Rockall Trough.

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

2021-03-31, M2.6 & M2.3, Rockall Trough

On the 31st of March 2021 at 02:47:08 UTC (03:47:08 local time), a magnitude M2.6 earthquake occurred in the Rockall Trough near the Hebrides Terrace Seamount, approximately 210 km north-northwest of Ireland. The epicentre location is indicated with a red circle in the map below, black lines denote major fault zones in and around Ireland. The earthquake occurred at a depth of 10 km, and was preceded by a magnitude M2.3 earthquake at the same location, occurring at 00:05:02 UTC (01:05:02 local time). Although earthquake detection rates in the Rockall Trough are lower than those of the Irish Sea, several events with magnitude M>2.0 have been detected in this region, most notably from 1980, when an earthquake of magnitude M4.0 occurred near the Hebrides Terrace Seamount.

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

Past Seismograms
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Live Seismograms
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Filtered versions here
DSB - Dublin
VAL - Kerry

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