Mag. 4.6 earthquake - Gulf of Alaska, 42 mi southeast of Perryville, Alaska, USA, on 27 Sep 10:32 pm (GMT -8) -
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 10 weeks earlier.
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Light magnitude 4.6 earthquake at 39 km depth
28 Sep 06:59 UTC: First to report: USGS after 27 minutes.
Local time at epicenter: 27 Sep 10:32 pm (GMT -8)
Magnitude: 4.6
Depth: 38.9 km
Epicenter latitude / longitude: 55.5103°N / 158.3282°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Veniaminof (98 km / 61 mi)
Nearby towns and cities:
68 km (42 mi) SE of Perryville (pop: 113) --> See nearby quakes!
87 km (54 mi) SSE of Chignik Lake (pop: 73) --> See nearby quakes!
90 km (56 mi) S of Chignik Lagoon (pop: 78) --> See nearby quakes!
138 km (86 mi) E of Sand Point (pop: 1,060) --> See nearby quakes!
161 km (100 mi) S of Port Heiden (pop: 98) --> See nearby quakes!
258 km (160 mi) ENE of King Cove (pop: 1,010) --> See nearby quakes!
431 km (268 mi) SW of Kodiak Station (pop: 1,300) --> See nearby quakes!
442 km (275 mi) WSW of Kodiak (pop: 6,250) --> See nearby quakes!
6034 km (3749 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
6034 km (3749 mi) NW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
87 km (54 mi) NE of Little Koniuji Island --> See nearby quakes!
112 km (70 mi) NE of Chernabura Island --> See nearby quakes!
Weather at epicenter at time of quake:
Broken Clouds
8.2°C (47 F), humidity: 74%, wind: 11 m/s (20 kts) from W
Primary data source: USGS (United States Geological Survey)
Broken Clouds
8.2°C (47 F), humidity: 74%, wind: 11 m/s (20 kts) from WEstimated released energy: 5 x 1011 joules (139 megawatt hours, equivalent to 120 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 4.6 | 39 km | 68 Km SE of Perryville, Alaska, USA | USGS |
| M 4.6 | 39 km | Alaska Peninsula, USA | EMSC |
User reports for this quake (1)
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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86.6 km N of epicenter [Map] / Light shaking (MMI IV) / complex motion difficult to describe / 10-15 s : First sounded and felt as though a very large animal was running throughout our apartment building, almost like running down the common area hallway, then felt like something huge hit the building and jolted the entire building, kind of from side to side, as though something ran into the outer side of building. | 3 users found this interesting. (reported through our app)
Earlier earthquakes in the same area
Mag. 4.6 earthquake - Gulf of Alaska, 42 mi southeast of Perryville, Alaska, USA, on 27 Sep 10:32 pm (GMT -8)
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