Major magnitude 6.9 earthquake - North Pacific Ocean, 113 mi south of Unalaska, Aleutians West (CA) County, Alaska, USA, on Thursday, 22 August 1940 at 03:27 (GMT)

Major magnitude 6.9 earthquake - North Pacific Ocean, 113 mi south of Unalaska, Aleutians West (CA) County, Alaska, USA, on Thursday, 22 August 1940 at 03:27 (GMT)

Major magnitude 6.9 earthquake at 15 km depth

Date & time: 22 Aug 1940 03:27:21 UTC
Magnitude: 6.9
Depth: 15.0 km
Epicenter latitude / longitude: 52.346°N / 165.571°W (North Pacific Ocean, United States)
Nearest volcano: Wide Bay (193 km / 120 mi)
Nearby towns and cities:
182 km (113 mi) SSE of Unalaska (pop: 4,490) --> See nearby quakes!
199 km (124 mi) S of Akutan (pop: 1,040) --> See nearby quakes!
232 km (144 mi) ESE of Nikolski (pop: 18) --> See nearby quakes!
313 km (195 mi) SSW of False Pass (pop: 40) --> See nearby quakes!
367 km (228 mi) SSW of Cold Bay (pop: 123) --> See nearby quakes!
370 km (230 mi) SW of King Cove (pop: 1,010) --> See nearby quakes!
470 km (292 mi) SW of Sand Point (pop: 1,060) --> See nearby quakes!
496 km (308 mi) SW of Nelson Lagoon (pop: 52) --> See nearby quakes!
576 km (358 mi) SW of Perryville (pop: 113) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.4 x 1015 joules (392 gigawatt hours, equivalent to 3.4 x 105 tons of TNT or 21.1 atomic bombs!) More info
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
MagnitudeDepthLocationSource
M 6.915 kmsouth of the Aleutian Islands (USA)USGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

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Aftershocks

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Recorded aftershocks, latest first (0 quakes):
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Earlier earthquakes in the same area

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