Mag. 4.5 earthquake - Gulf of Alaska, 40 mi east of Simeonof Island, Aleutians East County, Alaska, USA, on Wednesday, 22 July 2020 at 10:18 (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 4 hours earlier.
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Light magnitude 4.5 earthquake at 18 km depth
22 Jul 10:49 UTC: First to report: USGS after 31 minutes.
Jul 22 11:32: Magnitude recalculated from 4.6 to 4.5.
Hypocenter depth recalculated from 26.8 to 17.6 km.
Jul 22 11:32: Magnitude recalculated from 4.6 to 4.5.
Hypocenter depth recalculated from 26.8 to 17.6 km.
Magnitude: 4.5
Depth: 17.6 km
Epicenter latitude / longitude: 54.8136°N / 158.2757°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Stepovak Bay 2 (147 km / 91 mi)
Nearby towns and cities:
134 km (83 mi) SSE of Perryville (pop: 113) --> See nearby quakes!
153 km (95 mi) ESE of Sand Point (pop: 1,060) --> See nearby quakes!
163 km (101 mi) SSE of Chignik Lake (pop: 73) --> See nearby quakes!
165 km (102 mi) S of Chignik (pop: 87) --> See nearby quakes!
238 km (148 mi) S of Port Heiden (pop: 98) --> See nearby quakes!
260 km (161 mi) E of King Cove (pop: 1,010) --> See nearby quakes!
490 km (305 mi) SW of Kodiak (pop: 6,250) --> See nearby quakes!
490 km (305 mi) ENE of Akutan (pop: 1,040) --> See nearby quakes!
6056 km (3763 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6056 km (3763 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
64 km (40 mi) E of Simeonof Island --> See nearby quakes!
82 km (51 mi) E of Chernabura Island --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 3.5 x 1011 joules (98.6 megawatt hours, equivalent to 84.8 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 4.7 | 10 km | South of Alaska (USA) | GFZ |
| M 4.6 | 30 km | South Of Alaska (USA) | EMSC |
| M 4.5 | 18 km | 134 km SSE of Perryville, Alaska (USA) | USGS |
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. 4.5 earthquake - Gulf of Alaska, 40 mi east of Simeonof Island, Aleutians East County, Alaska, USA, on Wednesday, 22 July 2020 at 10:18 (GMT)
Click here to search our database for earlier earthquakes in the same area since 1900!
