Mag. 4.0 earthquake - Gulf of Alaska, 12 mi northeast of Little Koniuji Island, Aleutians East County, Alaska, USA, on Thursday, 23 July 2020 at 00:35 (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 18 hours earlier.
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Light magnitude 4.0 earthquake at 38 km depth
23 Jul 00:52 UTC: First to report: USGS after 17 minutes.
Magnitude: 4
Depth: 38.0 km
Epicenter latitude / longitude: 55.1385°N / 159.1779°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Stepovak Bay 2 (102 km / 63 mi)
Nearby towns and cities:
86 km (53 mi) S of Perryville (pop: 113) --> See nearby quakes!
87 km (54 mi) ESE of Sand Point (pop: 1,060) --> See nearby quakes!
127 km (79 mi) SSW of Chignik Lake (pop: 73) --> See nearby quakes!
136 km (85 mi) SSW of Chignik Lagoon (pop: 78) --> See nearby quakes!
200 km (124 mi) E of King Cove (pop: 1,010) --> See nearby quakes!
439 km (273 mi) ENE of Akutan (pop: 1,040) --> See nearby quakes!
495 km (308 mi) ENE of Unalaska (pop: 4,490) --> See nearby quakes!
510 km (317 mi) WSW of Kodiak (pop: 6,250) --> See nearby quakes!
6098 km (3789 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6098 km (3789 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
20 km (12 mi) NE of Little Koniuji Island --> See nearby quakes!
46 km (29 mi) NNE of Chernabura Island --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 6.3 x 1010 joules (17.5 megawatt hours, equivalent to 15.1 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 4.0 | 38 km | 86 km S of Perryville, Alaska (USA) | USGS |
| M 3.8 | 39 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. 4.0 earthquake - Gulf of Alaska, 12 mi northeast of Little Koniuji Island, Aleutians East County, Alaska, USA, on Thursday, 23 July 2020 at 00:35 (GMT)
Click here to search our database for earlier earthquakes in the same area since 1900!
