Mag. 4.2 earthquake - Gulf of Alaska, 71 mi southeast of Sand Point, Alaska, USA, on Wednesday, 21 Oct 2020 3:16 am (GMT -11) -
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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Light magnitude 4.2 earthquake at 16 km depth
21 Oct 19:18 UTC: First to report: USGS after 5 hours.
Local time at epicenter: Wednesday, 21 Oct 2020 3:16 am (GMT -11)
Magnitude: 4.2
Depth: 15.8 km
Epicenter latitude / longitude: 54.4492°N / 159.6148°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Stepovak Bay 2 (165 km / 103 mi)
Nearby towns and cities:
114 km (71 mi) SSE of Sand Point (pop: 1,060) --> See nearby quakes!
165 km (103 mi) S of Perryville (pop: 113) --> See nearby quakes!
186 km (116 mi) ESE of King Cove (pop: 1,010) --> See nearby quakes!
208 km (129 mi) SSW of Chignik Lake (pop: 73) --> See nearby quakes!
215 km (134 mi) ESE of Cold Bay (pop: 123) --> See nearby quakes!
401 km (249 mi) E of Akutan (pop: 1,040) --> See nearby quakes!
455 km (283 mi) E of Unalaska (pop: 4,490) --> See nearby quakes!
581 km (361 mi) SW of Kodiak (pop: 6,250) --> See nearby quakes!
6151 km (3822 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6151 km (3822 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
38 km (23 mi) S of Chernabura Island --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.3 x 1011 joules (35 megawatt hours, equivalent to 30.1 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 4.2 | 16 km | 113 Km SSE of Sand Point, Alaska, USA | USGS |
| M 4.2 | 16 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. 4.2 earthquake - Gulf of Alaska, 71 mi southeast of Sand Point, Alaska, USA, on Wednesday, 21 Oct 2020 3:16 am (GMT -11)
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