Light mag. 3.2 earthquake - Valdez-Cordova Parish, 10 mi northwest of Glennallen, Valdez-Cordova, Alaska, USA, on Sunday, 25 Apr 2021 12:21 am (GMT -8) -
Light magnitude 3.2 earthquake at 5 km depth
25 Apr 08:25 UTC: First to report: USGS after 4 minutes.
25 Apr 08:27: Hypocenter depth recalculated from 0.1 to 0.0 km (from 0.1 to 0 mi). Epicenter location corrected by 1.1 km (0.7 mi) towards ENE.
26 Apr 00:28: Magnitude recalculated from 3.3 to 3.2. Hypocenter depth recalculated from 0.0 to 5.0 km (from 0 to 3.1 mi). Epicenter location corrected by 3.6 km (2.2 mi) towards SSE.
Update Sun, 25 Apr 2021, 08:30Small magnitude 3.3 quake hits 12 miles northwest of Glennallen, Alaska, United States after midnight
3.3 quake 25 Apr 12:21 am (GMT -8)
An earthquake of magnitude 3.3 occurred after midnight on Sunday 25 April 2021 at 12:21 am local time near Glennallen, Valdez-Cordova, Alaska, USA, as reported by the United States Geological Survey.
According to preliminary data, the quake was located at a very shallow depth of miles. Shallow earthquakes are felt more strongly than deeper ones as they are closer to the surface. 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.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 3.3 earthquake as well.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Glennallen (pop. 480) located 12 miles from the epicenter, Gulkana (pop. 120) 13 miles away, Gakona (pop. 220) 15 miles away, Tazlina (pop. 300) 17 miles away, Copperville (pop. 190) 18 miles away, and Copper Center (pop. 330) 24 miles away.
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Date & time: 25 Apr 2021 08:21:37 UTC -
Local time at epicenter:
Sunday, 25 Apr 2021 12:21 am (GMT -8)
Depth: 5.0 km
Epicenter latitude / longitude: 62.2218°N / 145.7432°W
, United States
Nearest volcano: Wrangell
(95 km / 59 mi)
Nearby towns and cities:16 km (10 mi) NW of Glennallen
(pop: 483) --> See nearby quakes!23 km (14 mi) NE of Tolsona
(pop: 30) --> See nearby quakes!24 km (15 mi) WSW of Gakona
(pop: 218) --> See nearby quakes!35 km (22 mi) NW of Copper Center
(pop: 328) --> See nearby quakes!125 km (78 mi) NNE of Valdez
(pop: 3,870) --> See nearby quakes!225 km (140 mi) ENE of Eagle River
(pop: 24,800) --> See nearby quakes!225 km (140 mi) ENE of Eagle River (Anchorage)
(pop: 24,800) --> See nearby quakes!246 km (153 mi) ENE of Alaska City
(pop: 298,700) --> See nearby quakes!307 km (191 mi) SSE of Fairbanks
(pop: 32,300) --> See nearby quakes!760 km (472 mi) NW of Juneau
(pop: 32,800) --> See nearby quakes!
Primary data source: USGS
(United States Geological Survey)
Estimated released energy: 4 x 109
joules (1.11 megawatt hours, equivalent to 0.951 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.
|3.2||5 km||16 Km NW of Glennallen, Alaska, USA||USGS|
|3.4||5 km||CENTRAL ALASKA, USA||EMSC|
User reports for this quake (2)
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Tazlina (19.9 km SE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 15-20 s : Slight shaking that woke me from my sleep. | One user found this interesting.
Glennallen / Light shaking (MMI IV) / rattling, vibrating : Heater vents shaking bed shaking | One user found this interesting.
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