Mag. 3.4 earthquake - Gulf of Alaska, 72 mi southeast of Sand Point, Alaska, USA, on 20 Oct 3:05 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 day 5 hours earlier.
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Minor magnitude 3.4 earthquake at 25 km depth
21 Oct 02:33 UTC: First to report: USGS after 28 minutes.
Local time at epicenter: 20 Oct 3:05 pm (GMT -11)
Magnitude: 3.4
Depth: 24.9 km
Epicenter latitude / longitude: 54.3915°N / 159.7555°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Dana (167 km / 104 mi)
Nearby towns and cities:
115 km (72 mi) SSE of Sand Point (pop: 1,060) --> See nearby quakes!
173 km (108 mi) SSW of Perryville (pop: 113) --> See nearby quakes!
181 km (112 mi) ESE of King Cove (pop: 1,010) --> See nearby quakes!
201 km (125 mi) SSE of Nelson Lagoon (pop: 52) --> See nearby quakes!
210 km (130 mi) ESE of Cold Bay (pop: 123) --> See nearby quakes!
217 km (135 mi) SSW of Chignik Lake (pop: 73) --> See nearby quakes!
228 km (142 mi) SSW of Chignik (pop: 87) --> See nearby quakes!
241 km (150 mi) E of False Pass (pop: 40) --> See nearby quakes!
6161 km (3828 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6161 km (3828 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
46 km (28 mi) SSW of Chernabura Island --> See nearby quakes!
Weather at epicenter at time of quake:
Overcast Clouds
7.6°C (46 F), humidity: 69%, wind: 7 m/s (14 kts) from ENE
Primary data source: USGS (United States Geological Survey)
Overcast Clouds
7.6°C (46 F), humidity: 69%, wind: 7 m/s (14 kts) from ENEEstimated released energy: 7.9 x 109 joules (2.21 megawatt hours, equivalent to 1.9 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 3.4 | 25 km | 115 Km SSE of Sand Point, Alaska, USA | USGS |
| M 3.4 | 25 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. 3.4 earthquake - Gulf of Alaska, 72 mi southeast of Sand Point, Alaska, USA, on 20 Oct 3:05 pm (GMT -11)
Click here to search our database for earlier earthquakes in the same area since 1900!
