Mag. 3.8 earthquake - Gulf of Alaska, 21 mi northeast of Simeonof Island, Aleutians East County, Alaska, USA, on Thursday, 23 July 2020 at 05:42 (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 23 hours earlier.
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Minor magnitude 3.8 earthquake at 33 km depth
23 Jul 06:02 UTC: First to report: USGS after 20 minutes.
Magnitude: 3.8
Depth: 32.7 km
Epicenter latitude / longitude: 55.0988°N / 158.8566°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Stepovak Bay 2 (117 km / 73 mi)
Nearby towns and cities:
92 km (57 mi) SSE of Perryville (pop: 113) --> See nearby quakes!
107 km (67 mi) ESE of Sand Point (pop: 1,060) --> See nearby quakes!
129 km (80 mi) S of Chignik Lake (pop: 73) --> See nearby quakes!
136 km (85 mi) S of Chignik Lagoon (pop: 78) --> See nearby quakes!
179 km (111 mi) ESE of Nelson Lagoon (pop: 52) --> See nearby quakes!
206 km (128 mi) S of Port Heiden (pop: 98) --> See nearby quakes!
220 km (137 mi) E of King Cove (pop: 1,010) --> See nearby quakes!
486 km (302 mi) SW of Kodiak Station (pop: 1,300) --> See nearby quakes!
6080 km (3778 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6080 km (3778 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
34 km (21 mi) NE of Simeonof Island --> See nearby quakes!
56 km (35 mi) NE of Chernabura Island --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 3.2 x 1010 joules (8.78 megawatt hours, equivalent to 7.56 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 3.8 | 33 km | 92 km SSE of Perryville, Alaska (USA) | USGS |
| M 4.0 | 17 km | Alaska Peninsula (USA) | EMSC |
User reports for this quake (1)
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Perryville (92.7 km NNW of epicenter) [Map] / Light shaking (MMI IV) : Started off slow (reported through our app)
Earlier earthquakes in the same area
Mag. 3.8 earthquake - Gulf of Alaska, 21 mi northeast of Simeonof Island, Aleutians East County, Alaska, USA, on Thursday, 23 July 2020 at 05:42 (GMT)
Click here to search our database for earlier earthquakes in the same area since 1900!
