Mag. 3.7 earthquake - Gulf of Alaska, 56 mi south of Sand Point, Alaska, USA, on Wednesday, 12 August 2020 at 05:02 (GMT) -
This quake was likely an aftershock of the 7.8 quake Gulf of Alaska, 31 mi east of Simeonof Island, Aleutians East County, Alaska, USA, 22 July 2020 06:12 GMT, which had occurred 3 weeks earlier.
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Minor magnitude 3.7 earthquake at 9 km depth
12 Aug 06:44 UTC: First to report: USGS after 1 hour and 41 minutes.
Aug 12 07:48: Magnitude recalculated from 3.6 to 3.7.
Hypocenter depth recalculated from 4.9 to 9.1 km.
Aug 12 07:48: Magnitude recalculated from 3.6 to 3.7.
Hypocenter depth recalculated from 4.9 to 9.1 km.
Magnitude: 3.7
Depth: 9.1 km
Epicenter latitude / longitude: 54.5593°N / 160.8626°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Dutton (109 km / 68 mi)
Nearby towns and cities:
90 km (56 mi) SSW of Sand Point (pop: 1,060) --> See nearby quakes!
109 km (68 mi) ESE of King Cove (pop: 1,010) --> See nearby quakes!
138 km (86 mi) ESE of Cold Bay (pop: 123) --> See nearby quakes!
162 km (101 mi) S of Nelson Lagoon (pop: 52) --> See nearby quakes!
167 km (104 mi) E of False Pass (pop: 40) --> See nearby quakes!
186 km (115 mi) SW of Perryville (pop: 113) --> See nearby quakes!
322 km (200 mi) E of Akutan (pop: 1,040) --> See nearby quakes!
377 km (234 mi) ENE of Unalaska (pop: 4,490) --> See nearby quakes!
6222 km (3866 mi) NW of Washington (District of Columbia) (pop: 601,700) --> See nearby quakes!
6222 km (3866 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
78 km (48 mi) SSE of Wosnesenski Island --> See nearby quakes!
88 km (55 mi) WSW of Chernabura Island --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 2.2 x 1010 joules (6.22 megawatt hours, equivalent to 5.35 tons of TNT) More info
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.
| Magnitude | Depth | Location | Source |
| M 3.7 | 9.1 km | 89 km SSW of Sand Point, Alaska (USA) | USGS |
| M 3.7 | 9 km | Alaska Peninsula (USA) | EMSC |
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Earlier earthquakes in the same area
Mag. 3.7 earthquake - Gulf of Alaska, 56 mi south of Sand Point, Alaska, USA, on Wednesday, 12 August 2020 at 05:02 (GMT)
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