Weak mag. 3.5 earthquake - Gulf of Alaska, 94 mi northeast of Sand Point, Aleutians East County, Alaska, USA, on Monday, 22 Feb 2021 7:38 am (GMT -9) -
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Weak magnitude 3.5 earthquake at 46 km depth
22 Feb 16:42 UTC: First to report: EMSC after 4 minutes.
22 Feb 16:43: Now using data updates from USGS
22 Feb 17:52: Magnitude recalculated from 3.6 to 3.5. Hypocenter depth recalculated from 38.1 to 46.4 km (from 24 to 29 mi). Epicenter location corrected by 4.1 km (2.5 mi) towards E.
22 Feb 16:43: Now using data updates from USGS
22 Feb 17:52: Magnitude recalculated from 3.6 to 3.5. Hypocenter depth recalculated from 38.1 to 46.4 km (from 24 to 29 mi). Epicenter location corrected by 4.1 km (2.5 mi) towards E.
Update Mon, 22 Feb 2021, 16:48
Small tremor of magnitude 3.6 just reported 32 miles east of Perryville, Alaska, United States3.6 quake 22 Feb 7:38 am (GMT -9)
The United States Geological Survey reported a magnitude 3.6 quake in the United States near Perryville, Lake and Peninsula County, Alaska, only 9 minutes ago. The earthquake hit in the morning on Monday 22 February 2021 at 7:38 am local time at a moderately shallow depth of 24 miles. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 3.6 as well.
According to preliminary calculations, we do not expect that the quake was felt by many people and did not cause any damage. In Perryville (pop. 110, 32 miles away), Chignik Lagoon (pop. 78, 33 miles away), and Chignik Lake (pop. 73, 33 miles away), the quake was probably not felt.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 3.6 as well.
According to preliminary calculations, we do not expect that the quake was felt by many people and did not cause any damage. In Perryville (pop. 110, 32 miles away), Chignik Lagoon (pop. 78, 33 miles away), and Chignik Lake (pop. 73, 33 miles away), the quake was probably not felt.
Earthquake data:
Date & time: 22 Feb 2021 16:38:38 UTC -
Local time at epicenter: Monday, 22 Feb 2021 7:38 am (GMT -9)
Magnitude: 3.5
Depth: 46.4 km
Epicenter latitude / longitude: 55.8477°N / 158.2563°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Veniaminof (77 km / 48 mi)
Nearby towns and cities:
54 km (34 mi) SSE of Chignik Lagoon (pop: 78) --> See nearby quakes!
55 km (34 mi) SE of Chignik Lake (pop: 73) --> See nearby quakes!
56 km (35 mi) E of Perryville (pop: 113) --> See nearby quakes!
124 km (77 mi) S of Port Heiden (pop: 98) --> See nearby quakes!
152 km (94 mi) ENE of Sand Point (pop: 1,060) --> See nearby quakes!
185 km (115 mi) E of Nelson Lagoon (pop: 52) --> See nearby quakes!
269 km (167 mi) S of Egegik (pop: 106) --> See nearby quakes!
271 km (168 mi) ENE of King Cove (pop: 1,010) --> See nearby quakes!
405 km (252 mi) WSW of Kodiak Station (pop: 1,300) --> See nearby quakes!
416 km (259 mi) WSW of Kodiak (pop: 6,250) --> See nearby quakes!
Weather at epicenter at time of quake:
Clear Sky
-1°C (30 F), humidity: 89%, wind: 11 m/s (21 kts) from W
Primary data source: USGS (United States Geological Survey)Clear Sky
-1°C (30 F), humidity: 89%, wind: 11 m/s (21 kts) from WEstimated released energy: 1.1 x 1010 joules (3.12 megawatt hours, equivalent to 2.68 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 |
| 3.5 | 46 km | 50 Km S of Chignik, Alaska, USA | USGS |
| 3.5 | 46 km | ALASKA PENINSULA, USA | EMSC |
User reports for this quake
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