On July 29, 2021 at 06:15 UTC (July 28, 2021 22:51 local time) a magnitude 8.2 earthquake occurred approximately 80km south of the Alaska Penninsula (see map below). The USGS report the earthquake originated at a depth of 32 kilometers. Large earthquakes are common in this region as a result of thrust faulting at shallow depth on the subduction zone interface between the Pacific plate and the North America plate.
The event was recorded by seismic stations worldwide, including stations in the Irish National Seismic Network (INSN) (see figure below). The first seismic waves originating from the Alaska earthquake arrived ~6 minutes after the event origin.
For more information please see the links below: