Mag. 3.4 earthquake - Gulf of Alaska, 82 mi east of Sand Point, Alaska, USA, on Friday, 18 September 2020 at 08:19 (GMT) -
This quake was likely an aftershock of the 7.8 quake Gulf of Alaska, 31 mi east of Simeonof Island, Aleutians East County, Alaska, USA, 22 July 2020 06:12 GMT, which had occurred 8 weeks earlier.
Quake Data | Interactive map | User Reports | Earlier quakes in same area | Quakes in the US | Alaska | Alaska | Washington DC
Minor magnitude 3.4 earthquake at 38 km depth
18 Sep 08:30 UTC: First to report: USGS after 11 minutes.
Magnitude: 3.4
Depth: 38.1 km
Epicenter latitude / longitude: 55.0305°N / 158.4805°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Kupreanof (137 km / 85 mi)
Nearby towns and cities:
107 km (66 mi) SSE of Perryville (pop: 113) --> See nearby quakes!
133 km (82 mi) ESE of Sand Point (pop: 1,060) --> See nearby quakes!
137 km (85 mi) S of Chignik Lake (pop: 73) --> See nearby quakes!
142 km (88 mi) S of Chignik Lagoon (pop: 78) --> See nearby quakes!
203 km (126 mi) ESE of Nelson Lagoon (pop: 52) --> See nearby quakes!
213 km (132 mi) S of Port Heiden (pop: 98) --> See nearby quakes!
245 km (152 mi) E of King Cove (pop: 1,010) --> See nearby quakes!
270 km (168 mi) E of Cold Bay (pop: 123) --> See nearby quakes!
6060 km (3766 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6060 km (3766 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
52 km (33 mi) ENE of Simeonof Island --> See nearby quakes!
74 km (46 mi) ENE of Chernabura Island --> See nearby quakes!
Weather at epicenter at time of quake:
Clear Sky
10.3°C (51 F), humidity: 83%, wind: 10 km/h (5 kts) from WSW
Primary data source: USGS (United States Geological Survey)
Clear Sky
10.3°C (51 F), humidity: 83%, wind: 10 km/h (5 kts) from WSWEstimated released energy: 7.9 x 109 joules (2.21 megawatt hours, equivalent to 1.9 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 3.4 | 38 km | 106 Km SSE of Perryville, Alaska, USA | USGS |
| M 3.4 | 38 km | Alaska Peninsula, USA | EMSC |
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. 3.4 earthquake - Gulf of Alaska, 82 mi east of Sand Point, Alaska, USA, on Friday, 18 September 2020 at 08:19 (GMT)
Click here to search our database for earlier earthquakes in the same area since 1900!
