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Light mag. 4.5 earthquake - North Pacific Ocean, 43 mi southeast of Akutan, Aleutians East, Alaska, USA, on Sunday, Dec 12, 2021 at 3:41 am (GMT -9) -

Light mag. 4.5 earthquake - North Pacific Ocean, 43 mi southeast of Akutan, Aleutians East, Alaska, USA, on Sunday, Dec 12, 2021 at 3:41 am (GMT -9) Light mag. 4.5 earthquake - North Pacific Ocean, 43 mi southeast of Akutan, Aleutians East, Alaska, USA, on Sunday, Dec 12, 2021 at 3:41 am (GMT -9)

Light magnitude 4.5 earthquake at 47 km depth

12 Dec 13:02 UTC: First to report: USGS after 21 minutes.
Update Sun, 12 Dec 2021, 13:06

Moderate magnitude 4.5 quake hits 43 miles southeast of Akutan, Alaska, United States early morning

4.5 quake 12 Dec 3:41 am (GMT -9)
4.5 quake 12 Dec 3:41 am (GMT -9)
The United States Geological Survey reported a magnitude 4.5 quake in the United States near Akutan, Aleutians East, Alaska, only 25 minutes ago. The earthquake hit early morning on Sunday, December 12th, 2021, at 3:41 am local time at a moderately shallow depth of 29 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 4.5 as well.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Akutan (pop. 1000) located 43 miles from the epicenter, Unalaska (pop. 4,500) 65 miles away, and Dutch Harbor (pop. 4,400) 66 miles away.
VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you're in the area, please send us your experience through our reporting mechanism, either online or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.

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Earthquake details

Date & timeDec 12, 2021 12:41:08 UTC -
Local time at epicenterSunday, Dec 12, 2021 at 3:41 am (GMT -9)
StatusConfirmed
Magnitude4.5
Depth47.3 km
Epicenter latitude / longitude53.7495°N / 164.9488°W (North Pacific Ocean, Alaska, United States)
Antipode53.75°S / 15.051°E
Shaking intensityWeak shaking near epicenter
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoAkutan (80 km / 50 mi)
Nearby towns and cities69 km (43 mi) SE of Akutan (pop: 1,040) | Show on map | Quakes nearby
105 km (65 mi) E of Unalaska (pop: 4,490) | Show on map | Quakes nearby
106 km (66 mi) E of Dutch Harbor (pop: 4,380) | Show on map | Quakes nearby
158 km (98 mi) SW of False Pass (pop: 40) | Show on map | Quakes nearby
215 km (134 mi) SW of Cold Bay (pop: 123) | Show on map | Quakes nearby
224 km (139 mi) SW of King Cove (pop: 1,010) | Show on map | Quakes nearby
275 km (171 mi) ENE of Nikolski (pop: 18) | Show on map | Quakes nearby
346 km (215 mi) SW of Nelson Lagoon (pop: 52) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds 0.7°C (33 F), humidity: 59%, wind: 8 m/s (16 kts) from NNW
Estimated seismic energy released3.5 x 1011 joules (98.6 megawatt hours, equivalent to 84.8 tons of TNT) | about seismic energy
Show interactive Map
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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.
Mag.DepthLocationSource
4.547 km69 Km SE of Akutan, AlaskaUSGS
4.547 kmUNIMAK ISLAND REGION, ALASKAEMSC
4.547 kmUnimak Island Region, AlaskaRaspberryShake

Seismograms

Seismic station: Adak, Aleutian Islands, Alaska (ADK/IU network) | Distance from quake: 814 km / 506 mi | Show on map | Station Info
Seismic station Adak, Aleutian Islands, Alaska: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.

Earlier earthquakes in the same area

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