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Major magnitude 8.6 earthquake - 154 mi east of Unalaska, Aleutians West, Alaska, USA, on Monday, April 1, 1946 at 12:29 GMT

Major magnitude 8.6 earthquake - 154 mi east of Unalaska, Aleutians West, Alaska, USA, on Monday, April 1, 1946 at 12:29 GMT Major magnitude 8.6 earthquake - 154 mi east of Unalaska, Aleutians West, Alaska, USA, on Monday, April 1, 1946 at 12:29 GMT

Major magnitude 8.6 earthquake at 15 km depth

Earthquake details

Date & timeApr 1, 1946 12:29:01 UTC
Local time at epicenter
Depth15.0 km
Epicenter latitude / longitude53.492°N / 162.832°W (North Pacific Ocean, Alaska, United States)
Antipode53.492°S / 17.168°E
Shaking intensitySevere shaking near epicenter
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoIsanotski (153 km / 95 mi)
Nearby towns and cities156 km (97 mi) SSE of False Pass (pop: 40) | Show on map | Quakes nearby
178 km (110 mi) S of King Cove (pop: 1,010) | Show on map | Quakes nearby
189 km (117 mi) S of Cold Bay (pop: 123) | Show on map | Quakes nearby
206 km (128 mi) ESE of Akutan (pop: 1,040) | Show on map | Quakes nearby
248 km (154 mi) E of Unalaska (pop: 4,490) | Show on map | Quakes nearby
248 km (154 mi) E of Dutch Harbor (pop: 4,380) | Show on map | Quakes nearby
255 km (158 mi) SW of Sand Point (pop: 1,060) | Show on map | Quakes nearby
298 km (185 mi) SSW of Nelson Lagoon (pop: 52) | Show on map | Quakes nearby
358 km (223 mi) SW of Perryville (pop: 113) | Show on map | Quakes nearby
403 km (250 mi) SW of Chignik Lake (pop: 73) | Show on map | Quakes nearby
Estimated seismic energy released5 x 1017 joules (1.4 x 105 gigawatt hours, equivalent to 1.2 x 108 tons of TNT or 7486.7 atomic bombs!) | about seismic energy
Show interactive Map
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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.
8.615 km1946 Aleutian Islands (Unimak Island) Earthquake, Alaska (USA)USGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.


[More info]

Recorded aftershocks, latest first (7 quakes)

Date and timeMag
Feb 2, 1949 17:41
74 years ago

220 km
273 mi W of Unalaska, Aleutians West, Alaska, USAMore
May 26, 1948 09:16
75 years ago

0 km
22 mi SE of Sitkinak Island, Kodiak Island Borough, Alaska, USAMore
May 14, 1948 22:31
75 years ago

25 km
55 mi SE of King Cove, Aleutians East, Alaska, USAMore
Dec 25, 1946 11:13
76 years ago

90 km
Nov 1, 1946 11:14
76 years ago

25 km
33 mi S of Atka, Aleutians West, Alaska, USAMore
Oct 30, 1946 07:47
76 years ago

30 km
27 mi SE of Tigalda Island, Aleutians East, Alaska, USAMore
Jul 12, 1946 21:56
77 years ago

100 km
39 mi N of Nikolski, Aleutians West, Alaska, USAMore

Earlier earthquakes in the same area

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