Light mag. 3.9 earthquake - Gulf of Alaska, 96 mi east of Sand Point, Aleutians East County, Alaska, USA, on Tuesday, 30 Mar 2021 5:16 pm (GMT -8) -

Light mag. 3.9 earthquake - Gulf of Alaska, 96 mi east of Sand Point, Aleutians East County, Alaska, USA, on Tuesday, 30 Mar 2021 5:16 pm (GMT -8)

Light magnitude 3.9 earthquake at 12 km depth

31 Mar 01:21 UTC: First to report: USGS after 5 minutes.
31 Mar 01:22: Magnitude recalculated from 3.9 to 3.8. Hypocenter depth recalculated from 14.6 to 32.9 km (from 9.1 to 20 mi). Epicenter location corrected by 8.3 km (5.1 mi) towards NW.
... [show all] ...
31 Mar 01:27: Hypocenter depth recalculated from 12.1 to 11.9 km (from 7.5 to 7.4 mi).
Update Wed, 31 Mar 2021, 01:27
Small tremor of magnitude 3.9 just reported 52 miles southeast of Perryville, Alaska, United States
3.9 quake 30 Mar 5:16 pm (GMT -8)
3.9 quake 30 Mar 5:16 pm (GMT -8)
Just 10 minutes ago, a 3.9-magnitude earthquake struck near Perryville, Lake and Peninsula, Alaska, USA. The tremor was recorded in the afternoon on Tuesday 30 March 2021 at 5:16 pm local time, at a shallow depth of 7.5 miles below the surface.
The event was filed by the United States Geological Survey, the first seismological agency to report it.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 3.9 as well.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Perryville (pop. 110) located 52 miles from the epicenter.
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Earthquake data:

Date & time: 31 Mar 2021 01:16:54 UTC -
Local time at epicenter: Tuesday, 30 Mar 2021 5:16 pm (GMT -8)
Magnitude: 3.9
Depth: 11.9 km
Epicenter latitude / longitude: 55.4534°N / 158.0688°W (Gulf of Alaska, Alaska, United States)
Nearest volcano: Veniaminof (114 km / 71 mi)
Nearby towns and cities:
85 km (53 mi) SE of Perryville (pop: 113) --> See nearby quakes!
99 km (62 mi) SSE of Chignik Lake (pop: 73) --> See nearby quakes!
99 km (62 mi) SSE of Chignik Lagoon (pop: 78) --> See nearby quakes!
154 km (96 mi) E of Sand Point (pop: 1,060) --> See nearby quakes!
169 km (105 mi) SSE of Port Heiden (pop: 98) --> See nearby quakes!
206 km (128 mi) ESE of Nelson Lagoon (pop: 52) --> See nearby quakes!
273 km (170 mi) E of King Cove (pop: 1,010) --> See nearby quakes!
296 km (184 mi) E of Cold Bay (pop: 123) --> See nearby quakes!
422 km (262 mi) SW of Kodiak Station (pop: 1,300) --> See nearby quakes!
433 km (269 mi) SW of Kodiak (pop: 6,250) --> See nearby quakes!
Weather at epicenter at time of quake:
Few Clouds 2.7°C (37 F), humidity: 61%, wind: 11 m/s (21 kts) from WNW
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 4.5 x 1010 joules (12.4 megawatt hours, equivalent to 10.7 tons of TNT) More info
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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.
MagnitudeDepthLocationSource
3.912 km84 Km SE of Perryville, Alaska, USAUSGS
4.239 kmALASKA PENINSULA, USAEMSC

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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Chignik Bay, AK (95.8 km NNW of epicenter) [Map] / Weak shaking (MMI III) : Heard and felt, vibrations and slight side to side movement. Did not awake sleeping dogs. Person that has never felt an earthquake before asked if that was an earthquake, but did not need convincing that it was. Was also felt and recognized at the school. | 2 users found this interesting. (reported through our app)  
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