Mag. 3.9 earthquake - Gulf of Alaska, 75 mi southeast of Sand Point, Alaska, USA, on 19 Oct 10:27 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 32 minutes earlier.
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Minor magnitude 3.9 earthquake at 29 km depth
19 Oct 21:39 UTC: First to report: USGS after 13 minutes.
19 Oct 22:24: Magnitude recalculated from 3.6 to 3.9. Hypocenter depth recalculated from 37.0 to 28.5 km (from 23 to 17.7 mi). Epicenter location corrected by 10.1 km (6.3 mi) towards NW.
19 Oct 22:24: Magnitude recalculated from 3.6 to 3.9. Hypocenter depth recalculated from 37.0 to 28.5 km (from 23 to 17.7 mi). Epicenter location corrected by 10.1 km (6.3 mi) towards NW.
Local time at epicenter: 19 Oct 10:27 am (GMT -11)
Magnitude: 3.9
Depth: 28.5 km
Epicenter latitude / longitude: 54.3702°N / 159.6413°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Stepovak Bay 2 (182 km / 113 mi)
Nearby towns and cities:
121 km (75 mi) SSE of Sand Point (pop: 1,060) --> See nearby quakes!
174 km (108 mi) S of Perryville (pop: 113) --> See nearby quakes!
188 km (117 mi) ESE of King Cove (pop: 1,010) --> See nearby quakes!
207 km (128 mi) SSE of Nelson Lagoon (pop: 52) --> See nearby quakes!
217 km (135 mi) SSW of Chignik Lake (pop: 73) --> See nearby quakes!
217 km (135 mi) ESE of Cold Bay (pop: 123) --> See nearby quakes!
227 km (141 mi) SSW of Chignik Lagoon (pop: 78) --> See nearby quakes!
399 km (248 mi) E of Akutan (pop: 1,040) --> See nearby quakes!
6155 km (3825 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6155 km (3825 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
47 km (29 mi) S of Chernabura Island --> See nearby quakes!
Weather at epicenter at time of quake:
Few Clouds
8.1°C (47 F), humidity: 68%, wind: 6 m/s (12 kts) from WNW
Primary data source: USGS (United States Geological Survey)
Few Clouds
8.1°C (47 F), humidity: 68%, wind: 6 m/s (12 kts) from WNWEstimated 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 | 29 km | 120 Km SSE of Sand Point, Alaska, USA | USGS |
| M 3.9 | 28 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, 75 mi southeast of Sand Point, Alaska, USA, on 19 Oct 10:27 am (GMT -11)
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