Mag. 3.7 earthquake - Gulf of Alaska, 66 mi south of Sand Point, Alaska, USA, on Wednesday, 21 October 2020 at 03:41 (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 7 hours earlier.
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Minor magnitude 3.7 earthquake at 7 km depth
21 Oct 17:08 UTC: First to report: USGS after 13 hours.
22 Oct 02:04: Magnitude recalculated from 3.3 to 3.7. Hypocenter depth recalculated from 6.8 to 7.0 km (from 4.2 to 4.3 mi). Epicenter location corrected by 14.7 km (9.1 mi) towards WSW.
22 Oct 02:04: Magnitude recalculated from 3.3 to 3.7. Hypocenter depth recalculated from 6.8 to 7.0 km (from 4.2 to 4.3 mi). Epicenter location corrected by 14.7 km (9.1 mi) towards WSW.
Magnitude: 3.7
Depth: 7.0 km
Epicenter latitude / longitude: 54.4071°N / 160.0924°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Dana (156 km / 97 mi)
Nearby towns and cities:
107 km (66 mi) SSE of Sand Point (pop: 1,060) --> See nearby quakes!
160 km (100 mi) ESE of King Cove (pop: 1,010) --> See nearby quakes!
178 km (110 mi) SSW of Perryville (pop: 113) --> See nearby quakes!
189 km (118 mi) ESE of Cold Bay (pop: 123) --> See nearby quakes!
191 km (119 mi) SSE of Nelson Lagoon (pop: 52) --> See nearby quakes!
222 km (138 mi) SSW of Chignik Lake (pop: 73) --> See nearby quakes!
236 km (146 mi) SSW of Chignik (pop: 87) --> See nearby quakes!
370 km (230 mi) E of Akutan (pop: 1,040) --> See nearby quakes!
6181 km (3841 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6181 km (3841 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
55 km (34 mi) SW 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 | 7 km | 106 Km SSE of Sand Point, Alaska, USA | USGS |
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, 66 mi south of Sand Point, Alaska, USA, on Wednesday, 21 October 2020 at 03:41 (GMT)
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