Light mag. 4.0 earthquake - 2073 mi northwest of Sacramento, California, on 19 Oct 2:21 pm (GMT -11) -
This quake was likely an aftershock of the 7.6 quake Gulf of Alaska, 60 mi southeast of Санд-Пойнт, Aleutians East County, Alaska, USA, 19 Oct 2020 11:54 am (GMT -9), which had occurred 4 heures earlier.
Quake Data | Interactive map | User Reports | Earlier quakes in same area | Quakes in the US| Alaska

Séisme faible magnitude 4.0 at 36 km depth
20 Oct 01:36 UTC: Premier à signaler: EMSC après 15 minutes.
Date & time: 20 Oct 2020 01:21:29 UTC -
Local time at epicenter: 19 Oct 2:21 pm (GMT -11)
Magnitude: 4
Profondeur: 36.0 km
Epicenter latitude / longitude: 54.25°N / 159.49°W

Volcan le plus près: Stepovak Bay 2 (188 km / 117 mi)
Nearby towns and cities:
137 km SSE de Sand Point (pop: 1,060) --> Voir les séismes à proximité!
186 km S de Perryville (pop: 113) --> Voir les séismes à proximité!
203 km ESE de King Cove (pop: 1,010) --> Voir les séismes à proximité!
228 km S de Chignik Lake (pop: 73) --> Voir les séismes à proximité!
232 km ESE de Cold Bay (pop: 123) --> Voir les séismes à proximité!
237 km SSO de Chignik Lagoon (pop: 78) --> Voir les séismes à proximité!
409 km E de Akutan (pop: 1,040) --> Voir les séismes à proximité!
462 km E de Unalaska (pop: 4,490) --> Voir les séismes à proximité!
580 km SO de Kodiak Station (pop: 1,300) --> Voir les séismes à proximité!
590 km SO de Kodiak (pop: 6,250) --> Voir les séismes à proximité!
Weather at epicenter at time of quake:
Clear Sky
8.2°C (47 F), humidity: 75%, wind: 6 m/s (12 kts) from NW
Primary data source: EMSC (European-Mediterranean Seismological Centre)Clear Sky

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 | Profondeur | Location | Source |
M 4.0 | 36 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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There are no user reports for this quake yet. If you felt it Earlier earthquakes in the same area since 1900
- Date / time UTC| Mag |Profondeur|Age|Distance| Details
- 01 Apr 1946 12:29| 8.6 |15km / 9.3mi|il y a 75 ans|235km / 146mi| North Pacific Ocean, 154 mi E of Unalaska, Aleutians West (CA) County, Alaska, USA
- 10 Nov 1938 20:18| 8.2 |35km / 22mi|il y a 82 ans|133km / 83mi| Gulf of Alaska, 47 mi NE of Simeonof Island, Aleutians East County, Alaska, USA
- 22 Jul 2020 06:12| 7.8 |28km / 17mi|il y a 33 semaines|107km / 66mi| Gulf of Alaska, 31 mi E of Simeonof Island, Aleutians East County, Alaska, USA
- 19 Oct 2020 20:54| 7.6 |35km / 22mi|il y a 20 semaines|42km / 26mi| Gulf of Alaska, 60 mi SE of Sand Point, Aleutians East County, Alaska, USA
- 31 May 1917 08:47| 7.4 |35km / 22mi|il y a 104 ans|76km / 47mi| Gulf of Alaska, 5.3 mi SW of Little Koniuji Island, Aleutians East County, Alaska, USA
- 04 Sep 1989 13:14| 7.1 |11.4km / 7.1mi|il y a 32 ans|223km / 138mi| Gulf of Alaska, USA
- 14 May 1948 22:31| 7.1 |25km / 16mi|il y a 73 ans|117km / 73mi| Gulf of Alaska, 55 mi SE of King Cove, Aleutians East County, Alaska, USA
- 30 May 1991 13:17| 7.0 |28km / 18mi|il y a 30 ans|141km / 88mi| Gulf of Alaska, 31 mi E of Cherni Island, Aleutians East County, Alaska, USA
- 04 May 1923 16:26| 7.0 |25km / 16mi|il y a 98 ans|244km / 152mi| Gulf of Alaska, 11 mi S of South Island, Kodiak Island County, Alaska, USA
- 13 May 1993 11:59| 6.9 |32km / 20mi|il y a 28 ans|120km / 75mi| Gulf of Alaska, 11 mi S of Sand Point, Aleutians East County, Alaska, USA
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