Mag. 4.8 earthquake - Gulf of Alaska, 78 mi southeast of Sand Point, Alaska, USA, on 19 Oct 1:56 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 19 km depth
20 Oct 01:10 UTC: First to report: GeoAu after 14 minutes.
20 Oct 01:31: Now using data updates from USGS
20 Oct 01:39: Magnitude recalculated from 4.4 to 4.8. Hypocenter depth recalculated from 21.0 to 18.7 km (from 13 to 11.6 mi). Epicenter location corrected by 4 km (2.5 mi) towards NW.
20 Oct 01:31: Now using data updates from USGS
20 Oct 01:39: Magnitude recalculated from 4.4 to 4.8. Hypocenter depth recalculated from 21.0 to 18.7 km (from 13 to 11.6 mi). Epicenter location corrected by 4 km (2.5 mi) towards NW.
Local time at epicenter: 19 Oct 1:56 pm (GMT -11)
Magnitude: 4.8
Depth: 18.7 km
Epicenter latitude / longitude: 54.3376°N / 159.584°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Dana (169 km / 105 mi)
Nearby towns and cities:
126 km (78 mi) SSE of Sand Point (pop: 1,060) --> See nearby quakes!
177 km (110 mi) S of Perryville (pop: 113) --> See nearby quakes!
193 km (120 mi) ESE of King Cove (pop: 1,010) --> See nearby quakes!
212 km (132 mi) SSE of Nelson Lagoon (pop: 52) --> See nearby quakes!
220 km (136 mi) SSW of Chignik Lake (pop: 73) --> See nearby quakes!
222 km (138 mi) ESE of Cold Bay (pop: 123) --> See nearby quakes!
229 km (142 mi) SSW of Chignik Lagoon (pop: 78) --> See nearby quakes!
296 km (184 mi) SSW of Port Heiden (pop: 98) --> See nearby quakes!
6153 km (3823 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6153 km (3823 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
50 km (31 mi) S of Chernabura Island --> See nearby quakes!
Weather at epicenter at time of quake:
Clear Sky
8.2°C (47 F), humidity: 74%, wind: 7 m/s (13 kts) from WNW
Primary data source: USGS (United States Geological Survey)
Clear Sky
8.2°C (47 F), humidity: 74%, wind: 7 m/s (13 kts) from WNWEstimated 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 | 19 km | 125 Km SSE of Sand Point, Alaska, USA | USGS |
| M 4.8 | 23 km | South of Alaska, USA | GFZ |
| M 4.8 | 20 km | South Of Alaska, USA | EMSC |
| M 4.9 | 10 km | South of Alaska, USA | GeoAu |
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. 4.8 earthquake - Gulf of Alaska, 78 mi southeast of Sand Point, Alaska, USA, on 19 Oct 1:56 pm (GMT -11)
Click here to search our database for earlier earthquakes in the same area since 1900!
