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Strong mag. 6.1 earthquake - Bering Sea, 113 mi southwest of Adak, Aleutians West, Alaska, USA, on Friday, Sep 24, 2021 at 2:52 am (GMT -9) -

Strong mag. 6.1 earthquake - Bering Sea, 113 mi southwest of Adak, Aleutians West, Alaska, USA, on Friday, Sep 24, 2021 at 2:52 am (GMT -9) Strong mag. 6.1 earthquake - Bering Sea, 113 mi southwest of Adak, Aleutians West, Alaska, USA, on Friday, Sep 24, 2021 at 2:52 am (GMT -9)

Strong magnitude 6.1 earthquake at 40 km depth

24 Sep 11:59 UTC: First to report: USGS after 7 minutes.
24 Sep 12:14: Magnitude recalculated from 6.3 to 6.1. Hypocenter depth recalculated from 50.0 to 39.6 km (from 31 to 25 mi). Epicenter location corrected by 17 km (10.6 mi) towards NNW.

Earthquake details

Date & timeSep 24, 2021 11:52:31 UTC -
Local time at epicenterFriday, Sep 24, 2021 at 2:52 am (GMT -9)
StatusConfirmed
Magnitude6.1
Depth39.6 km
Epicenter latitude / longitude51.1957°N / 179.0286°W (Bering Sea, Alaska, United States)
Antipode51.196°S / 0.971°E
Shaking intensityLight shaking
Felt1 report
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoGareloi (83 km / 52 mi)
Nearby towns and cities182 km (113 mi) WSW of Adak (pop: 332) | Show on map | Quakes nearby
351 km (218 mi) WSW of Atka (pop: 64) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds 8.4°C (47 F), humidity: 89%, wind: 4 m/s (9 kts) from NNW
Estimated seismic energy released8.9 x 1013 joules (24.8 gigawatt hours, equivalent to 21301 tons of TNT or 1.3 atomic bombs!) | about seismic energy
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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
6.140 km182 Km WSW of Adak, AlaskaUSGS
6.010 kmNear AnchorageRENASS
6.121 kmAndreanof Islands, Aleutian IslandsGFZ
6.124 kmANDREANOF ISLANDS, ALEUTIAN IS.EMSC
6.220 kmAndreanof Islands, Aleutian Islands, United States [Sea: United States]INGV
6.148 kmAndreanof Islands, Aleutian IslandsGeoAu
6.232 kmAndreanof Islands, Aleutian IslandsBMKG

Seismograms

Seismic station: Adak, Aleutian Islands, Alaska (ADK/IU network) | Distance from quake: 179 km / 111 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 (3)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Ada kabar labcsmb / not felt / simple rolling (tilting sideways along one direction) : Nyalahin bkan | 13 users found this interesting.  
Sterling / not felt (reported through our app)
ATKA (351 km ENE of epicenter) [Map] / Light shaking (MMI IV) / 1-2 minutes

Aftershocks

[More info]

Recorded aftershocks, latest first (23 quakes)

Date and timeMag
Depth
LocationDetails
Mar 10, 2022 03:00
28 weeks ago
2.8

20 km
Bering Sea, Alaska, USAMore
Mar 9, 2022 11:31
28 weeks ago
3.9

35 km
Bering Sea, 127 mi SW of Adak, Aleutians West, Alaska, USAMore
Feb 27, 2022 21:31
30 weeks ago
3.5

20 km
Bering Sea, 82 mi SW of Adak, Aleutians West, Alaska, USAMore
Feb 22, 2022 16:47
31 weeks ago
2.6

45 km
126 Km SW of Adak, AlaskaMore
Feb 20, 2022 22:09
31 weeks ago
3.9

35 km
Bering Sea, 132 mi W of Adak, Aleutians West, Alaska, USAMore
Feb 10, 2022 03:45
32 weeks ago
4.3

18 km
Bering Sea, 148 mi SW of Adak, Aleutians West, Alaska, USAMore
Feb 2, 2022 09:07
33 weeks ago
4.4

48 km
Bering Sea, 83 mi SW of Adak, Aleutians West, Alaska, USAMore
Jan 19, 2022 23:31
35 weeks ago
4.2

15 km
North Pacific Ocean, Alaska, USAMore
Jan 19, 2022 23:24
35 weeks ago
4.5

25 km
North Pacific Ocean, Alaska, USAMore
Jan 13, 2022 05:47
36 weeks ago
5.0

35 km
Bering Sea, Alaska, USAMore
Jan 3, 2022 05:54
38 weeks ago
3.5

32 km
Bering Sea, Alaska, USAMore
Dec 27, 2021 23:11
39 weeks ago
2.4

10.3 km
228 Km WSW of Adak, AlaskaMore
Nov 26, 2021 19:48
43 weeks ago
2.1

6.7 km
211 Km WSW of Adak, AlaskaMore
Nov 18, 2021 09:50
44 weeks ago
5.2

54 km
Bering Sea, 80 mi SW of Adak, Aleutians West, Alaska, USAMore
Nov 15, 2021 01:19
45 weeks ago
2.9

10.9 km
Bering Sea, Alaska, USAMore
Nov 12, 2021 00:00
45 weeks ago
3.8

18 km
Bering Sea, 82 mi W of Adak, Aleutians West, Alaska, USAMore
Nov 8, 2021 12:39
46 weeks ago
2.0

6.6 km
235 Km WSW of Adak, AlaskaMore
Nov 8, 2021 08:04
46 weeks ago
2.5

12 km
153 Km WSW of Adak, AlaskaMore
Oct 29, 2021 11:47
47 weeks ago
3.7

21 km
Bering Sea, 90 mi SW of Adak, Aleutians West, Alaska, USAMore
Oct 10, 2021 23:04
50 weeks ago
2.5

12 km
181 Km WSW of Adak, AlaskaMore
Oct 8, 2021 06:36
50 weeks ago
2.8

10 km
Bering Sea, 81 mi W of Adak, Aleutians West, Alaska, USAMore
Oct 6, 2021 03:49
50 weeks ago
2.1

16 km
134 Km WSW of Adak, AlaskaMore
Oct 5, 2021 14:42
51 weeks ago
3.1

28 km
Bering Sea, 87 mi SW of Adak, Aleutians West, Alaska, USAMore

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