Mag. 4.7 earthquake - Gulf of Alaska, 26 mi northeast of Simeonof Island, Aleutians East County, Alaska, USA, on Wednesday, 22 July 2020 at 10:08 (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 4.7 earthquake at 35 km depth
22 Jul 10:42 UTC: First to report: USGS after 33 minutes.
Jul 22 11:06: Magnitude recalculated from 4.8 to 4.7.
Hypocenter depth recalculated from 41.0 to 34.8 km.
Jul 22 11:06: Magnitude recalculated from 4.8 to 4.7.
Hypocenter depth recalculated from 41.0 to 34.8 km.
Magnitude: 4.7
Depth: 34.8 km
Epicenter latitude / longitude: 55.0659°N / 158.6912°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Kupreanof (97 km / 60 mi)
Nearby towns and cities:
98 km (61 mi) SSE of Perryville (pop: 113) --> See nearby quakes!
119 km (74 mi) ESE of Sand Point (pop: 1,060) --> See nearby quakes!
132 km (82 mi) S of Chignik Lake (pop: 73) --> See nearby quakes!
138 km (86 mi) S of Chignik (pop: 87) --> See nearby quakes!
189 km (118 mi) ESE of Nelson Lagoon (pop: 52) --> See nearby quakes!
209 km (130 mi) S of Port Heiden (pop: 98) --> See nearby quakes!
231 km (144 mi) E of King Cove (pop: 1,010) --> See nearby quakes!
491 km (305 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 (26 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: 7.1 x 1011 joules (197 megawatt hours, equivalent to 169 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 5.0 | 10 km | Alaska Peninsula (USA) | GFZ |
| M 4.8 | 40 km | Alaska Peninsula (USA) | EMSC |
| M 5.0 | 20 km | Alaska Peninsula (USA) | GeoAu |
| M 4.7 | 35 km | Alaska Peninsula (USA) | USGS |
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake yet. If you felt it be the first to report it!
Earlier earthquakes in the same area
Mag. 4.7 earthquake - Gulf of Alaska, 26 mi northeast of Simeonof Island, Aleutians East County, Alaska, USA, on Wednesday, 22 July 2020 at 10:08 (GMT)
Click here to search our database for earlier earthquakes in the same area since 1900!
