Mag. 3.9 earthquake - Gulf of Alaska, 57 mi south of Sand Point, Alaska, USA, on 26 Sep 5:08 pm (GMT -11) -
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 10 weeks earlier.
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Minor magnitude 3.9 earthquake at 10 km depth
27 Sep 04:40 UTC: First to report: USGS after 32 minutes.
27 Sep 05:12: Magnitude recalculated from 3.4 to 3.9. Hypocenter depth recalculated from 26.1 to 10.0 km (from 16.2 to 6.2 mi). Epicenter location corrected by 9.8 km (6.1 mi) towards SE.
27 Sep 05:12: Magnitude recalculated from 3.4 to 3.9. Hypocenter depth recalculated from 26.1 to 10.0 km (from 16.2 to 6.2 mi). Epicenter location corrected by 9.8 km (6.1 mi) towards SE.
Local time at epicenter: 26 Sep 5:08 pm (GMT -11)
Magnitude: 3.9
Depth: 10.0 km
Epicenter latitude / longitude: 54.5632°N / 160.9731°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Dutton (97 km / 60 mi)
Nearby towns and cities:
91 km (57 mi) SSW of Sand Point (pop: 1,060) --> See nearby quakes!
102 km (64 mi) ESE of King Cove (pop: 1,010) --> See nearby quakes!
132 km (82 mi) ESE of Cold Bay (pop: 123) --> See nearby quakes!
160 km (99 mi) E of False Pass (pop: 40) --> See nearby quakes!
161 km (100 mi) S of Nelson Lagoon (pop: 52) --> See nearby quakes!
189 km (118 mi) SW of Perryville (pop: 113) --> See nearby quakes!
315 km (196 mi) E of Akutan (pop: 1,040) --> See nearby quakes!
370 km (230 mi) ENE of Unalaska (pop: 4,490) --> See nearby quakes!
6228 km (3870 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6228 km (3870 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
75 km (46 mi) SSE of Wosnesenski Island --> See nearby quakes!
95 km (59 mi) WSW of Chernabura Island --> See nearby quakes!
Weather at epicenter at time of quake:
Overcast Clouds
6.7°C (44 F), humidity: 69%, wind: 12 m/s (23 kts) from N
Primary data source: USGS (United States Geological Survey)
Overcast Clouds
6.7°C (44 F), humidity: 69%, wind: 12 m/s (23 kts) from NEstimated 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 | 10 km | 91 Km SSW of Sand Point, Alaska, USA | USGS |
| M 3.9 | 10 km | Alaska Peninsula, 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, 57 mi south of Sand Point, Alaska, USA, on 26 Sep 5:08 pm (GMT -11)
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