Mag. 4.2 earthquake - Gulf of Alaska, 40 mi east of Simeonof Island, Aleutians East County, Alaska, USA, on Wednesday, 22 July 2020 at 06:53 (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 41 minutes earlier.
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Light magnitude 4.2 earthquake at 29 km depth
22 Jul 07:32 UTC: First to report: USGS after 39 minutes.
Jul 22 08:12: Magnitude recalculated from 4.4 to 4.2.
Hypocenter depth recalculated from 42.0 to 29.0 km.
Jul 22 08:12: Magnitude recalculated from 4.4 to 4.2.
Hypocenter depth recalculated from 42.0 to 29.0 km.
Magnitude: 4.2
Depth: 29.0 km
Epicenter latitude / longitude: 55.105°N / 158.3232°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Veniaminof (126 km / 78 mi)
Nearby towns and cities:
104 km (64 mi) SSE of Perryville (pop: 113) --> See nearby quakes!
131 km (81 mi) SSE of Chignik Lake (pop: 73) --> See nearby quakes!
132 km (82 mi) S of Chignik (pop: 87) --> See nearby quakes!
140 km (87 mi) E of Sand Point (pop: 1,060) --> See nearby quakes!
205 km (128 mi) S of Port Heiden (pop: 98) --> See nearby quakes!
254 km (158 mi) E of King Cove (pop: 1,010) --> See nearby quakes!
470 km (292 mi) SW of Kodiak (pop: 6,250) --> See nearby quakes!
492 km (306 mi) ENE of Akutan (pop: 1,040) --> See nearby quakes!
6048 km (3758 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6048 km (3758 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
64 km (40 mi) ENE of Simeonof Island --> See nearby quakes!
86 km (54 mi) ENE of Chernabura Island --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated 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 | 29 km | 103 km SSE of Perryville, Alaska (USA) | USGS |
| M 4.6 | 40 km | Alaska Peninsula (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, 40 mi east of Simeonof Island, Aleutians East County, Alaska, USA, on Wednesday, 22 July 2020 at 06:53 (GMT)
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