Mag. 3.9 earthquake - Gulf of Alaska, 73 mi southeast of Sand Point, Alaska, USA, on Wednesday, 21 October 2020 at 14:15 (GMT) -
This quake was likely an aftershock of the 7.6 quake Gulf of Alaska, 60 mi southeast of Sand Point, Aleutians East County, Alaska, USA, 19 Oct 2020 11:54 am (GMT -9), which had occurred 1 day 17 hours earlier.
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Minor magnitude 3.9 earthquake at 21 km depth
21 Oct 19:06 UTC: First to report: USGS after 5 hours.
Magnitude: 3.9
Depth: 20.7 km
Epicenter latitude / longitude: 54.3991°N / 159.6523°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Dana (170 km / 106 mi)
Nearby towns and cities:
118 km (73 mi) SSE of Sand Point (pop: 1,060) --> See nearby quakes!
171 km (106 mi) S of Perryville (pop: 113) --> See nearby quakes!
186 km (116 mi) ESE of King Cove (pop: 1,010) --> See nearby quakes!
204 km (127 mi) SSE of Nelson Lagoon (pop: 52) --> See nearby quakes!
214 km (133 mi) SSW of Chignik Lake (pop: 73) --> See nearby quakes!
215 km (134 mi) ESE of Cold Bay (pop: 123) --> See nearby quakes!
225 km (140 mi) SSW of Chignik (pop: 87) --> See nearby quakes!
399 km (248 mi) E of Akutan (pop: 1,040) --> See nearby quakes!
6155 km (3824 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6155 km (3824 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
44 km (27 mi) S of Chernabura Island --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 4.5 x 1010 joules (12.4 megawatt hours, equivalent to 10.7 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 3.9 | 21 km | 117 Km SSE of Sand Point, Alaska, USA | USGS |
| M 3.9 | 21 km | South Of Alaska, 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. 3.9 earthquake - Gulf of Alaska, 73 mi southeast of Sand Point, Alaska, USA, on Wednesday, 21 October 2020 at 14:15 (GMT)
Click here to search our database for earlier earthquakes in the same area since 1900!
