Mag. 4.8 earthquake - North Pacific Ocean, 86 mi southeast of Sand Point, Alaska, USA, on 19 Oct 1:34 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 4 hours earlier.
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Light magnitude 4.8 earthquake at 16 km depth
20 Oct 00:47 UTC: First to report: GFZ after 13 minutes.
20 Oct 01:14: Now using data updates from USGS
20 Oct 01:50: Magnitude recalculated from 4.3 to 4.8. Hypocenter depth recalculated from 26.4 to 16.1 km (from 16.4 to 10 mi). Epicenter location corrected by 6.6 km (4.1 mi) towards NW.
20 Oct 01:14: Now using data updates from USGS
20 Oct 01:50: Magnitude recalculated from 4.3 to 4.8. Hypocenter depth recalculated from 26.4 to 16.1 km (from 16.4 to 10 mi). Epicenter location corrected by 6.6 km (4.1 mi) towards NW.
Local time at epicenter: 19 Oct 1:34 pm (GMT -11)
Magnitude: 4.8
Depth: 16.1 km
Epicenter latitude / longitude: 54.2177°N / 159.5704°W

Nearest volcano: Stepovak Bay 2 (183 km / 114 mi)
Nearby towns and cities:
138 km (86 mi) SSE of Sand Point (pop: 1,060) --> See nearby quakes!
190 km (118 mi) S of Perryville (pop: 113) --> See nearby quakes!
200 km (124 mi) ESE of King Cove (pop: 1,010) --> See nearby quakes!
224 km (139 mi) SSE of Nelson Lagoon (pop: 52) --> See nearby quakes!
229 km (142 mi) ESE of Cold Bay (pop: 123) --> See nearby quakes!
232 km (144 mi) SSW of Chignik Lake (pop: 73) --> See nearby quakes!
242 km (150 mi) SSW of Chignik Lagoon (pop: 78) --> See nearby quakes!
258 km (160 mi) ESE of False Pass (pop: 40) --> See nearby quakes!
6157 km (3826 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6157 km (3826 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
63 km (39 mi) S of Chernabura Island --> See nearby quakes!
Weather at epicenter at time of quake:
Clear Sky
8.2°C (47 F), humidity: 75%, wind: 7 m/s (14 kts) from WNW
Primary data source: USGS (United States Geological Survey)
Clear Sky

Estimated released energy: 1 x 1012 joules (278 megawatt hours, equivalent to 239 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 4.8 | 16 km | 138 Km SSE of Sand Point, Alaska, USA | USGS |
M 4.8 | 2 km | South Of Alaska, USA | EMSC |
M 5.0 | 20 km | South of Alaska, USA | GeoAu |
M 4.9 | 10 km | South of Alaska, USA | GFZ |
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
Mag. 4.8 earthquake - North Pacific Ocean, 86 mi southeast of Sand Point, Alaska, USA, on 19 Oct 1:34 pm (GMT -11)- Date / time UTC| Mag |Depth|Age|Distance| Details
- 01 Apr 1946 12:29| 8.6 |15km / 9.3mi|75 years ago|229km / 142mi| 1946 Aleutian Islands (Unimak Island) Earthquake, Alaska (USA)
- 10 Nov 1938 20:18| 8.2 |35km / 22mi|82 years ago|139km / 87mi| Alaska Peninsula (USA)
- 22 Jul 2020 06:12| 7.8 |28km / 17mi|27 weeks ago|113km / 70mi| 105 Km SSE of Perryville, Alaska (USA)
- 19 Oct 2020 20:54| 7.6 |35km / 22mi|14 weeks ago|45km / 28mi| 97 Km SE of Sand Point, Alaska, USA
- 31 May 1917 08:47| 7.4 |35km / 22mi|104 years ago|80km / 50mi| South of Alaska (USA)
- 04 Sep 1989 13:14| 7.1 |11.4km / 7.1mi|31 years ago|229km / 142mi| South of Alaska (USA)
- 14 May 1948 22:31| 7.1 |25km / 16mi|73 years ago|114km / 71mi| Alaska Peninsula (USA)
- 30 May 1991 13:17| 7.0 |28km / 18mi|30 years ago|137km / 85mi| Alaska Peninsula (USA)
- 30 Dec 1901 22:34| 7.0 |unknown|119 years ago|248km / 154mi| South of Alaska (USA)
- 13 May 1993 11:59| 6.9 |32km / 20mi|28 years ago|121km / 75mi| Alaska Peninsula (USA)
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