Light mag. 4.0 earthquake - Gulf of Alaska, 63 mi southeast of Sand Point, Alaska, USA, on 20 Oct 1:33 pm (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 jour 4 heures earlier.
Quake Data | Interactive map | User Reports | Earlier quakes in same area | Quakes in the US| Alaska | Alaska
Séisme faible magnitude 4.0 at 24 km depth
21 Oct 01:01 UTC: Premier à signaler: USGS après 27 minutes.
21 Oct 02:20: Magnitude recalculée de 3.7 à 4.0. Profondeur recalculée de 16.5 à 23.6 km (de 10.3 à 14.7 mi). Emplacement de l'épicentre corrigé de 16.1 km (10 mi) au NNW.
21 Oct 02:20: Magnitude recalculée de 3.7 à 4.0. Profondeur recalculée de 16.5 à 23.6 km (de 10.3 à 14.7 mi). Emplacement de l'épicentre corrigé de 16.1 km (10 mi) au NNW.
Date & time: 21 Oct 2020 00:33:51 UTC -
Local time at epicenter: 20 Oct 1:33 pm (GMT -11)
Magnitude: 4
Profondeur: 23.6 km
Epicenter latitude / longitude: 54.5676°N / 159.6697°W
(Gulf of Alaska, Alaska, États-Unis)Volcan le plus près: Stepovak Bay 2 (167 km / 104 mi)
Nearby towns and cities:
101 km SSE de Sand Point (pop: 1,060) --> Voir les séismes à proximité!
153 km SSO de Perryville (pop: 113) --> Voir les séismes à proximité!
178 km ESE de King Cove (pop: 1,010) --> Voir les séismes à proximité!
196 km SSO de Chignik Lake (pop: 73) --> Voir les séismes à proximité!
207 km SSO de Chignik Lagoon (pop: 78) --> Voir les séismes à proximité!
207 km ESE de Cold Bay (pop: 123) --> Voir les séismes à proximité!
399 km E de Akutan (pop: 1,040) --> Voir les séismes à proximité!
453 km ENE de Unalaska (pop: 4,490) --> Voir les séismes à proximité!
564 km SO de Kodiak Station (pop: 1,300) --> Voir les séismes à proximité!
574 km SO de Kodiak (pop: 6,250) --> Voir les séismes à proximité!
Weather at epicenter at time of quake:
Overcast Clouds
7.7°C (46 F), humidity: 66%, wind: 5 m/s (9 kts) from E
Primary data source: USGS (United States Geological Survey)Overcast Clouds
7.7°C (46 F), humidity: 66%, wind: 5 m/s (9 kts) from EEstimated 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 | Profondeur | Location | Source |
| M 4.0 | 24 km | 100 Km SSE of Sand Point, Alaska, USA | USGS |
| M 4.0 | 24 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.
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
Click here to search our database for earlier earthquakes in the same area since 1900!
