Mag. 4.2 earthquake - Gulf of Alaska, 15 mi east of Simeonof Island, Aleutians East County, Alaska, USA, on Wednesday, 22 July 2020 at 06:30 (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 17 minutes earlier.
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Light magnitude 4.2 earthquake at 17 km depth
22 Jul 06:46 UTC: First to report: USGS after 16 minutes.
Jul 22 08:02: Magnitude recalculated from 4.0 to 4.2.
Hypocenter depth recalculated from 4.7 to 17.2 km.
Jul 22 08:02: Magnitude recalculated from 4.0 to 4.2.
Hypocenter depth recalculated from 4.7 to 17.2 km.
Magnitude: 4.2
Depth: 17.2 km
Epicenter latitude / longitude: 54.8879°N / 158.8859°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Stepovak Bay 2 (121 km / 75 mi)
Nearby towns and cities:
114 km (71 mi) ESE of Sand Point (pop: 1,060) --> See nearby quakes!
115 km (71 mi) S of Perryville (pop: 113) --> See nearby quakes!
152 km (95 mi) S of Chignik Lake (pop: 73) --> See nearby quakes!
159 km (99 mi) S of Chignik (pop: 87) --> See nearby quakes!
220 km (137 mi) E of King Cove (pop: 1,010) --> See nearby quakes!
453 km (281 mi) ENE of Akutan (pop: 1,040) --> See nearby quakes!
508 km (316 mi) ENE of Unalaska (pop: 4,490) --> See nearby quakes!
513 km (319 mi) SW of Kodiak (pop: 6,250) --> See nearby quakes!
6090 km (3784 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6090 km (3784 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> 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 | 17 km | 114 km ESE of Sand Point, Alaska (USA) | USGS |
| M 4.2 | 30 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, 15 mi east of Simeonof Island, Aleutians East County, Alaska, USA, on Wednesday, 22 July 2020 at 06:30 (GMT)
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