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On the 29th of September, 2022, at 15:32:32 UTC a magnitude M5.7 earthquake occurred along Reykjanes Ridge in the North Atlantic. The earthquake occurred at a depth of 10km and locates approximately 1700km west of Ireland, with the red circle indicating the epicentre on the map below. Earthquakes with magnitudes up to M7 have been recorded in the northern Mid-Atlantic Ridge, of which the largest was M7.1, occurring on the 13th of Feb 2015 in the Charlie-Gibbs Fracture zone.
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: