Mag. 4.6 earthquake - North Pacific Ocean, 87 mi south of Sand Point, Alaska, USA, on 21 Oct 12:34 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 1 day 15 hours earlier.
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Light magnitude 4.6 earthquake at 17 km depth
21 Oct 11:49 UTC: First to report: USGS after 15 minutes.
Local time at epicenter: 21 Oct 12:34 am (GMT -11)
Magnitude: 4.6
Depth: 17.3 km
Epicenter latitude / longitude: 54.1499°N / 159.7837°W
(North Pacific Ocean, Alaska, United States)Nearest volcano: Dana (189 km / 117 mi)
Nearby towns and cities:
140 km (87 mi) SSE of Sand Point (pop: 1,060) --> See nearby quakes!
192 km (119 mi) ESE of King Cove (pop: 1,010) --> See nearby quakes!
200 km (124 mi) SSW of Perryville (pop: 113) --> See nearby quakes!
221 km (137 mi) ESE of Cold Bay (pop: 123) --> See nearby quakes!
225 km (140 mi) SSE of Nelson Lagoon (pop: 52) --> See nearby quakes!
243 km (151 mi) SSW of Chignik Lake (pop: 73) --> See nearby quakes!
254 km (158 mi) SSW of Chignik (pop: 87) --> See nearby quakes!
390 km (243 mi) E of Akutan (pop: 1,040) --> See nearby quakes!
6172 km (3835 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6172 km (3835 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
72 km (45 mi) SSW of Chernabura Island --> See nearby quakes!
Weather at epicenter at time of quake:
Light Rain
7.4°C (45 F), humidity: 81%, wind: 13 m/s (26 kts) from E
Primary data source: USGS (United States Geological Survey)
Light Rain
7.4°C (45 F), humidity: 81%, wind: 13 m/s (26 kts) from EEstimated released energy: 5 x 1011 joules (139 megawatt hours, equivalent to 120 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 4.6 | 17 km | 139 Km SSE of Sand Point, Alaska, USA | USGS |
| M 4.6 | 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. 4.6 earthquake - North Pacific Ocean, 87 mi south of Sand Point, Alaska, USA, on 21 Oct 12:34 am (GMT -11)
Click here to search our database for earlier earthquakes in the same area since 1900!
