Mag. 4.9 earthquake - 60 mi southwest of King Cove, Aleutians East County, Alaska, on Thursday, 20 August 2020 at 16:35 (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 4 weeks earlier.
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Light magnitude 4.9 earthquake at 40 km depth
20 Aug 16:46 UTC: First to report: GFZ after 11 minutes.
Hypocenter depth recalculated from 10.0 to 40.0 km.
Hypocenter depth recalculated from 10.0 to 40.0 km.
Magnitude: 4.9
Depth: 40.0 km
Epicenter latitude / longitude: 54.27°N / 162.92°W
(Gulf of Alaska, United States)Nearest volcano: Roundtop (71 km / 44 mi)
Nearby towns and cities:
72 km (45 mi) SSE of False Pass (pop: 40) --> See nearby quakes!
96 km (60 mi) SSW of King Cove (pop: 1,010) --> See nearby quakes!
103 km (64 mi) S of Cold Bay (pop: 123) --> See nearby quakes!
186 km (116 mi) E of Akutan (pop: 1,040) --> See nearby quakes!
195 km (121 mi) SW of Sand Point (pop: 1,060) --> See nearby quakes!
221 km (137 mi) SSW of Nelson Lagoon (pop: 52) --> See nearby quakes!
240 km (149 mi) ENE of Unalaska (pop: 4,490) --> See nearby quakes!
302 km (187 mi) SW of Perryville (pop: 113) --> See nearby quakes!
6357 km (3950 mi) NW of Washington DC (pop: 601,700) --> See nearby quakes!
6357 km (3950 mi) NW of Washington DC (pop: 601,700) --> See nearby quakes!
22 km (14 mi) SW of Sanak Island --> See nearby quakes!
172 km (107 mi) E of Rootok Island --> See nearby quakes!
Primary data source: GFZ (German Research Centre for Geosciences)
Estimated released energy: 1.4 x 1012 joules (392 megawatt hours, equivalent to 338 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 4.9 | 40 km | Alaska Peninsula (USA) | GFZ |
| M 5.0 | 57 km | Alaska Peninsula (USA) | EMSC |
| M 5.1 | 44 km | Alaska Peninsula (USA) | GeoAu |
| M 5.0 | 45 km | 87 km SSE of False Pass, Alaska (USA) | USGS |
User reports for this quake (1)
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
364.1 km NE of epicenter [Map] / Light shaking (MMI IV) (reported through our app)
Earlier earthquakes in the same area
Mag. 4.9 earthquake - 60 mi southwest of King Cove, Aleutians East County, Alaska, on Thursday, 20 August 2020 at 16:35 (GMT)
Click here to search our database for earlier earthquakes in the same area since 1900!
