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Strong mag. 5.5 earthquake - North Pacific Ocean, 126 mi southwest of Unalaska, Aleutians West, Alaska, USA, on Monday, Nov 21, 2022 at 4:09 am (GMT -11) -

Strong mag. 5.5 earthquake - North Pacific Ocean, 126 mi southwest of Unalaska, Aleutians West, Alaska, USA, on Monday, Nov 21, 2022 at 4:09 am (GMT -11) Strong mag. 5.5 earthquake - North Pacific Ocean, 126 mi southwest of Unalaska, Aleutians West, Alaska, USA, on Monday, Nov 21, 2022 at 4:09 am (GMT -11)

Strong magnitude 5.5 earthquake at 14 km depth

21 Nov 15:14 UTC: First to report: IRIS after 5 minutes.
21 Nov 15:14: Now using data updates from USGS
... [show all] ...
21 Nov 21:38: Hypocenter depth recalculated from 19.4 to 13.9 km (from 12.1 to 8.6 mi). Epicenter location corrected by 1.6 km (1 mi) towards NNW.
Update Mon, 21 Nov 2022, 15:18

Significant earthquake of magnitude 5.4 just reported 45 miles southeast of Nikolski, Alaska, United States

5.4 quake 21 Nov 4:09 am (GMT -11)
5.4 quake 21 Nov 4:09 am (GMT -11)
Just 9 minutes ago, a 5.4-magnitude earthquake struck near Nikolski, Aleutians West, Alaska, USA. The tremor was recorded early morning on Monday, November 21st, 2022, at 4:09 am local time, at a shallow depth of 10.6 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 citizen-seismograph network of RaspberryShake which listed the quake at magnitude 5.4 as well. A third agency, The Incorporated Research Institutions for Seismology (IRIS), reported the same quake at magnitude 5.4.
Based on the preliminary seismic data, the quake should not have caused any significant damage, but was probably felt by many people as light vibration in the area of the epicenter.
Weak shaking might have been felt in Nikolski (pop. 18) located 45 miles from the epicenter.
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 & timeNov 21, 2022 15:09:29 UTC -
Local time at epicenterMonday, Nov 21, 2022 at 4:09 am (GMT -11)
StatusConfirmed
Magnitude5.5
Depth13.9 km
Epicenter latitude / longitude52.3536°N / 168.2072°W (North Pacific Ocean, Alaska, United States)
Antipode52.354°S / 11.793°E
Shaking intensityModerate shaking near epicenter
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoVsevidof (92 km / 57 mi)
Nearby towns and cities79 km (49 mi) SE of Nikolski (pop: 18) | Show on map | Quakes nearby
203 km (126 mi) SW of Unalaska (pop: 4,490) | Show on map | Quakes nearby
204 km (127 mi) SSW of Dutch Harbor (pop: 4,380) | Show on map | Quakes nearby
256 km (159 mi) SW of Akutan (pop: 1,040) | Show on map | Quakes nearby
421 km (262 mi) SW of False Pass (pop: 40) | Show on map | Quakes nearby
479 km (297 mi) SW of Cold Bay (pop: 123) | Show on map | Quakes nearby
491 km (305 mi) SW of King Cove (pop: 1,010) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds 4.7°C (40 F), humidity: 92%, wind: 12 m/s (22 kts) from NNW
Estimated seismic energy released1.1 x 1013 joules (3.12 gigawatt hours, equivalent to 2682 tons of TNT or 0.2 atomic bombs!) | 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
5.514 km78 Km SE of Nikolski, AlaskaUSGS
5.510 km72 Km SE of Nikolski, AlaskaIRIS
5.514 kmFox Islands, Aleutian IslandsRaspberryShake
5.510 kmFox Islands, Aleutian IslandsGFZ
5.520 kmFOX ISLANDS, ALEUTIAN ISLANDSEMSC
5.610 kmNear AnchorageRENASS
5.710.2 kmFox Islands, Aleutian Islands, United States [Sea: United States]INGV
5.623 kmFox Islands, Aleutian IslandsGeoAu

Seismograms

Seismic station: Adak, Aleutian Islands, Alaska (ADK/IU network) | Distance from quake: 581 km / 361 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. Bandpass filter applied: 0.02-5.0 Hz. 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.

Aftershocks

[More info]

Recorded aftershocks, latest first (8 quakes)

Date and timeMag
Depth
LocationDetails
Jan 2, 2023 17:58
5 weeks ago
4.3

45 km
North Pacific Ocean, 129 mi SW of Unalaska, Aleutians West, Alaska, USAMore
Jan 2, 2023 00:50
5 weeks ago
4.3

38 km
North Pacific Ocean, 127 mi SW of Unalaska, Aleutians West, Alaska, USAMore
Dec 22, 2022 14:31
7 weeks ago
3.2

10 km
North Pacific Ocean, 38 mi SE of Nikolski, Aleutians West, Alaska, USAMore
Dec 5, 2022 07:11
9 weeks ago
4.9

10 km
North Pacific Ocean, 132 mi SW of Unalaska, Aleutians West, Alaska, USAMore
Nov 23, 2022 03:26
11 weeks ago
2.7

10 km
North Pacific Ocean, 52 mi SE of Nikolski, Aleutians West, Alaska, USAMore
Nov 22, 2022 03:27
11 weeks ago
4.6

16 km
North Pacific Ocean, 127 mi SW of Unalaska, Aleutians West, Alaska, USAMore
Nov 22, 2022 03:27
11 weeks ago
3.7

26 km
North Pacific Ocean, 134 mi SW of Unalaska, Aleutians West, Alaska, USAMore
Nov 21, 2022 21:21
11 weeks ago
2.9

10 km
North Pacific Ocean, 59 mi SE of Nikolski, Aleutians West, Alaska, USAMore

Earlier earthquakes in the same area

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