Mag. 4.0 earthquake - North Pacific Ocean, 82 mi southeast of Sand Point, Alaska, USA, on 20 Oct 2:36 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 17 hours earlier.
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Light magnitude 4.0 earthquake at 23 km depth
20 Oct 14:21 UTC: First to report: USGS after 46 minutes.
Local time at epicenter: 20 Oct 2:36 am (GMT -11)
Magnitude: 4
Depth: 23.0 km
Epicenter latitude / longitude: 54.2624°N / 159.6387°W
(North Pacific Ocean, Alaska, United States)Nearest volcano: Dana (183 km / 114 mi)
Nearby towns and cities:
132 km (82 mi) SSE of Sand Point (pop: 1,060) --> See nearby quakes!
186 km (116 mi) S of Perryville (pop: 113) --> See nearby quakes!
194 km (120 mi) ESE of King Cove (pop: 1,010) --> See nearby quakes!
223 km (139 mi) ESE of Cold Bay (pop: 123) --> See nearby quakes!
400 km (248 mi) E of Akutan (pop: 1,040) --> See nearby quakes!
452 km (281 mi) E of Unalaska (pop: 4,490) --> See nearby quakes!
585 km (364 mi) SW of Kodiak Station (pop: 1,300) --> See nearby quakes!
596 km (370 mi) SW of Kodiak (pop: 6,250) --> See nearby quakes!
6159 km (3827 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6159 km (3827 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
59 km (36 mi) S of Chernabura Island --> See nearby quakes!
Weather at epicenter at time of quake:
Few Clouds
6.9°C (44 F), humidity: 66%, wind: 5 m/s (9 kts) from N
Primary data source: USGS (United States Geological Survey)
Few Clouds
6.9°C (44 F), humidity: 66%, wind: 5 m/s (9 kts) from NEstimated released energy: 6.3 x 1010 joules (17.5 megawatt hours, equivalent to 15.1 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 4.0 | 23 km | 131 Km SSE of Sand Point, Alaska, USA | USGS |
| M 4.0 | 23 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. 4.0 earthquake - North Pacific Ocean, 82 mi southeast of Sand Point, Alaska, USA, on 20 Oct 2:36 am (GMT -11)
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