Mag. 4.1 earthquake - Gulf of Alaska, 77 mi southeast of Sand Point, Alaska, USA, on 21 Oct 6:55 pm (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 2 days earlier.
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Light magnitude 4.1 earthquake at 20 km depth
22 Oct 06:18 UTC: First to report: USGS after 23 minutes.
Local time at epicenter: 21 Oct 6:55 pm (GMT -11)
Magnitude: 4.1
Depth: 19.8 km
Epicenter latitude / longitude: 54.3441°N / 159.6063°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Dana (177 km / 110 mi)
Nearby towns and cities:
124 km (77 mi) SSE of Sand Point (pop: 1,060) --> See nearby quakes!
177 km (110 mi) S of Perryville (pop: 113) --> See nearby quakes!
192 km (119 mi) ESE of King Cove (pop: 1,010) --> See nearby quakes!
221 km (137 mi) ESE of Cold Bay (pop: 123) --> See nearby quakes!
402 km (250 mi) E of Akutan (pop: 1,040) --> See nearby quakes!
455 km (282 mi) E of Unalaska (pop: 4,490) --> See nearby quakes!
578 km (359 mi) SW of Kodiak Station (pop: 1,300) --> See nearby quakes!
588 km (366 mi) SW of Kodiak (pop: 6,250) --> See nearby quakes!
6154 km (3824 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6154 km (3824 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
49 km (31 mi) S of Chernabura Island --> See nearby quakes!
Weather at epicenter at time of quake:
Moderate Rain
9.2°C (49 F), humidity: 91%, wind: 19 m/s (37 kts) from E
Primary data source: USGS (United States Geological Survey)
Moderate Rain
9.2°C (49 F), humidity: 91%, wind: 19 m/s (37 kts) from EEstimated released energy: 8.9 x 1010 joules (24.8 megawatt hours, equivalent to 21.3 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 4.1 | 20 km | 124 Km SSE of Sand Point, Alaska, USA | USGS |
| M 4.1 | 20 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. 4.1 earthquake - Gulf of Alaska, 77 mi southeast of Sand Point, Alaska, USA, on 21 Oct 6:55 pm (GMT -11)
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