Mag. 4.1 earthquake - Gulf of Alaska, 25 mi northeast of Simeonof Island, Aleutians East County, Alaska, USA, on Wednesday, 22 July 2020 at 06:33 (GMT) -
This quake was likely an aftershock of the 7.8 quake Gulf of Alaska, 31 mi east of Simeonof Island, Aleutians East County, Alaska, USA, 22 July 2020 06:12 GMT, which had occurred 21 minutes earlier.
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Light magnitude 4.1 earthquake at 10 km depth
22 Jul 06:51 UTC: First to report: USGS after 18 minutes.
Jul 22 07:52: Magnitude recalculated from 4.6 to 4.1.
Hypocenter depth recalculated from 16.4 to 10.0 km.
Jul 22 07:52: Magnitude recalculated from 4.6 to 4.1.
Hypocenter depth recalculated from 16.4 to 10.0 km.
Magnitude: 4.1
Depth: 10.0 km
Epicenter latitude / longitude: 55.0424°N / 158.6763°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Kupreanof (177 km / 110 mi)
Nearby towns and cities:
101 km (63 mi) SSE of Perryville (pop: 113) --> See nearby quakes!
120 km (75 mi) ESE of Sand Point (pop: 1,060) --> See nearby quakes!
135 km (84 mi) S of Chignik Lake (pop: 73) --> See nearby quakes!
140 km (87 mi) S of Chignik (pop: 87) --> See nearby quakes!
212 km (131 mi) S of Port Heiden (pop: 98) --> See nearby quakes!
232 km (144 mi) E of King Cove (pop: 1,010) --> See nearby quakes!
468 km (291 mi) ENE of Akutan (pop: 1,040) --> See nearby quakes!
492 km (306 mi) SW of Kodiak (pop: 6,250) --> See nearby quakes!
6072 km (3773 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6072 km (3773 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
41 km (25 mi) ENE of Simeonof Island --> See nearby quakes!
63 km (39 mi) ENE of Chernabura Island --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 8.9 x 1010 joules (24.8 megawatt hours, equivalent to 21.3 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 4.1 | 10 km | 101 km SSE of Perryville, Alaska (USA) | USGS |
| M 4.6 | 2 km | South Of Alaska (USA) | EMSC |
User reports for this quake (1)
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
King Salmon, AK / Light shaking (MMI IV)
Earlier earthquakes in the same area
Mag. 4.1 earthquake - Gulf of Alaska, 25 mi northeast of Simeonof Island, Aleutians East County, Alaska, USA, on Wednesday, 22 July 2020 at 06:33 (GMT)
Click here to search our database for earlier earthquakes in the same area since 1900!
