Mag. 4.1 earthquake - North Pacific Ocean, 94 mi southeast of Sand Point, Alaska, USA, on Tuesday, 20 October 2020 at 19:43 (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 23 hours earlier.
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Light magnitude 4.1 earthquake at 20 km depth
20 Oct 22:12 UTC: First to report: USGS after 2 hours and 29 minutes.
21 Oct 19:08: Magnitude recalculated from 3.4 to 4.1. Hypocenter depth recalculated from 20.0 to 19.8 km (from 12.4 to 12.3 mi). Epicenter location corrected by 5.7 km (3.6 mi) towards SE.
21 Oct 19:08: Magnitude recalculated from 3.4 to 4.1. Hypocenter depth recalculated from 20.0 to 19.8 km (from 12.4 to 12.3 mi). Epicenter location corrected by 5.7 km (3.6 mi) towards SE.
Magnitude: 4.1
Depth: 19.8 km
Epicenter latitude / longitude: 54.0943°N / 159.5348°W
(North Pacific Ocean, Alaska, United States)Nearest volcano: Dana (197 km / 122 mi)
Nearby towns and cities:
151 km (94 mi) SSE of Sand Point (pop: 1,060) --> See nearby quakes!
204 km (127 mi) S of Perryville (pop: 113) --> See nearby quakes!
209 km (130 mi) ESE of King Cove (pop: 1,010) --> See nearby quakes!
238 km (148 mi) ESE of Cold Bay (pop: 123) --> See nearby quakes!
407 km (253 mi) E of Akutan (pop: 1,040) --> See nearby quakes!
458 km (285 mi) E of Unalaska (pop: 4,490) --> See nearby quakes!
594 km (369 mi) SW of Kodiak Station (pop: 1,300) --> See nearby quakes!
604 km (376 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!
77 km (48 mi) S of Chernabura Island --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated 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 | 151 Km SSE of Sand Point, Alaska, USA | USGS |
| M 3.4 | 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 - North Pacific Ocean, 94 mi southeast of Sand Point, Alaska, USA, on Tuesday, 20 October 2020 at 19:43 (GMT)
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