Mag. 4.2 earthquake - Gulf of Alaska, 60 mi southeast of Sand Point, Alaska, USA, on 20 Oct 11:42 am (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 day 2 hours earlier.
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Light magnitude 4.2 earthquake at 18 km depth
20 Oct 23:26 UTC: First to report: USGS after 44 minutes.
Local time at epicenter: 20 Oct 11:42 am (GMT -11)
Magnitude: 4.2
Depth: 18.0 km
Epicenter latitude / longitude: 54.5351°N / 159.932°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Dana (148 km / 92 mi)
Nearby towns and cities:
96 km (60 mi) SSE of Sand Point (pop: 1,060) --> See nearby quakes!
161 km (100 mi) SSW of Perryville (pop: 113) --> See nearby quakes!
164 km (102 mi) ESE of King Cove (pop: 1,010) --> See nearby quakes!
182 km (113 mi) SSE of Nelson Lagoon (pop: 52) --> See nearby quakes!
193 km (120 mi) ESE of Cold Bay (pop: 123) --> See nearby quakes!
382 km (237 mi) E of Akutan (pop: 1,040) --> See nearby quakes!
436 km (271 mi) ENE of Unalaska (pop: 4,490) --> See nearby quakes!
590 km (366 mi) SW of Kodiak (pop: 6,250) --> See nearby quakes!
6167 km (3832 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6167 km (3832 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
37 km (23 mi) SW of Chernabura Island --> See nearby quakes!
Weather at epicenter at time of quake:
Overcast Clouds
7.4°C (45 F), humidity: 66%, wind: 4 m/s (8 kts) from ESE
Primary data source: USGS (United States Geological Survey)
Overcast Clouds
7.4°C (45 F), humidity: 66%, wind: 4 m/s (8 kts) from ESEEstimated released energy: 1.3 x 1011 joules (35 megawatt hours, equivalent to 30.1 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 | Depth | Location | Source |
| M 4.2 | 18 km | 96 Km SSE of Sand Point, Alaska, USA | USGS |
| M 4.2 | 18 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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Earlier earthquakes in the same area
Mag. 4.2 earthquake - Gulf of Alaska, 60 mi southeast of Sand Point, Alaska, USA, on 20 Oct 11:42 am (GMT -11)
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