Mag. 4.0 earthquake - Gulf of Alaska, 71 mi southeast of Sand Point, Alaska, USA, on Tuesday, 20 October 2020 at 08:16 (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 11 hours earlier.
Quake Data | Interactive map | User Reports | Earlier quakes in same area | Quakes in the US | Alaska | Alaska | Washington DC
Light magnitude 4.0 earthquake at 19 km depth
21 Oct 07:26 UTC: First to report: USGS after 23 hours.
Magnitude: 4
Depth: 19.3 km
Epicenter latitude / longitude: 54.3983°N / 159.7444°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Dana (167 km / 104 mi)
Nearby towns and cities:
115 km (71 mi) SSE of Sand Point (pop: 1,060) --> See nearby quakes!
173 km (107 mi) SSW of Perryville (pop: 113) --> See nearby quakes!
181 km (112 mi) ESE of King Cove (pop: 1,010) --> See nearby quakes!
201 km (125 mi) SSE of Nelson Lagoon (pop: 52) --> See nearby quakes!
210 km (130 mi) ESE of Cold Bay (pop: 123) --> See nearby quakes!
393 km (244 mi) E of Akutan (pop: 1,040) --> See nearby quakes!
446 km (277 mi) E of Unalaska (pop: 4,490) --> See nearby quakes!
591 km (367 mi) SW of Kodiak (pop: 6,250) --> See nearby quakes!
6160 km (3828 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6160 km (3828 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
45 km (28 mi) SSW of Chernabura Island --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated 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 | 19 km | 115 Km SSE of Sand Point, Alaska, USA | USGS |
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake yet. If you felt it be the first to report it!
Earlier earthquakes in the same area
Mag. 4.0 earthquake - Gulf of Alaska, 71 mi southeast of Sand Point, Alaska, USA, on Tuesday, 20 October 2020 at 08:16 (GMT)
Click here to search our database for earlier earthquakes in the same area since 1900!
