Five Pictures Plate boundary Extra Info Subduction of the Pacific Plate beneath the North American Plate ---- Alaska-Aleutian Mega thrust On Adak Island, cracks occurred in prefabricated wood buildings; on Shemya Island, cracks were observed in an asphalt runway. It occurred at a depth of 118 km (73 miles) and was located 25 km (15 miles) WNW of Amchitka, 325 km (203 miles) W of Adak and 334 km (209 miles) ESE of Shemya. The pattern of energy release suggest the presence of three asperities along the plate interface, each causing a pulse of moment release. The rupture process and tectonic implications of the great 1964 Prince William Sound earthquake. Journal of Geophysical Research: Solid Earth. 2020-09-17 03:29:26 UTC 4.2 magnitude, 153 km depth Rat Islands, Aleutian Islands 4.2 magnitude earthquake 2020-09-17 03:29:26 UTC at 03:29 September 17, 2020 UTC Plate Boundary Between the Pacific and North American Crustal Plates. Magnitude Range ≥ 4.0 ANSS Comcat ; Tectonic Summary. 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