A major earthquake with magnitude 8.0 occurred in the Gulf of Alaska on the 23rd January 2018 at 09:31:41 UTC at a depth of about 25km. A tsunami warning was issued but has been cancelled. The Aleutian arc extends approximately 3,000 km from the Gulf of Alaska in the east to the Kamchatka Peninsula in the west. It marks the region where the Pacific plate subducts into the mantle beneath the North America plate. This subduction is responsible for the generation of the Aleutian Islands and the deep offshore Aleutian Trench. The Aleutian arc is a seismically active region, evidenced by the many moderate to large earthquakes occurring each year.
The earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).
Further information is available from the following webpages:
More information about the INSN is available via this link.