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Strong mag. 6.4 earthquake - on Tuesday, 1 December 2020 at 16:22 (GMT) - information

Very strong mag. 6.4 earthquake - Bering Sea, 28 mi southeast of Nikolski, Aleutians West, Alaska, USA, on Tuesday, Dec 1, 2020 at 7:22 am (GMT -9)

Very strong mag. 6.4 earthquake - Bering Sea, 28 mi southeast of Nikolski, Aleutians West, Alaska, USA, on Tuesday, Dec 1, 2020 at 7:22 am (GMT -9) Very strong mag. 6.4 earthquake - Bering Sea, 28 mi southeast of Nikolski, Aleutians West, Alaska, USA, on Tuesday, Dec 1, 2020 at 7:22 am (GMT -9)

Very strong magnitude 6.4 earthquake at 23 km depth

1 Dec 16:30 UTC: First to report: USGS after 7 minutes.
1 Dec 16:41: Magnitude recalculated from 6.2 to 6.3. Hypocenter depth recalculated from 37.0 to 39.3 km (from 23 to 24 mi). Epicenter location corrected by 15 km (9.1 mi) towards NNW.
... [show all] ...
7 Dec 17:02: Epicenter location corrected by 2.8 km (1.8 mi) towards SE.
Update Tue, 1 Dec 2020, 16:45

Significant magnitude 6.3 earthquake 25 miles east of Nikolski, Alaska

6.3 quake 1 Dec 7:22 am (GMT -9)
6.3 quake 1 Dec 7:22 am (GMT -9)
A magnitude 6.3 earthquake near Nikolski was reported only 22 minutes ago by the United States Geological Survey (USGS), considered the key international and national agency that monitors seismic activity in the US. The earthquake occurred at a moderately shallow depth of 24 miles beneath the epicenter in the morning on Tuesday 1 December 2020 at 7.22 am local time. 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 Geoscience Australia (GeoAu), which listed it as a magnitude 6.4 earthquake. Other agencies reporting the same quake include Italy's National Institute of Geophysics and Volcanology (INGV) at magnitude 6.3, European-Mediterranean Seismological Centre (EMSC) at magnitude 6.3, and German Research Centre for Geosciences (GFZ) at magnitude 6.0.
Generally quakes of this magnitude are recorded by more than one agency and the results can vary, with subsequent reports that come in after the first one often showing more accuracy.
Based on the preliminary seismic data, the quake should have been widely felt by almost everyone in the area of the epicenter. It might have caused light to moderate damage. Moderate shaking probably occurred in Nikolski (pop. 18) located 25 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 & timeDec 1, 2020 16:22:39 UTC
Local time at epicenterTuesday, Dec 1, 2020 at 7:22 am (GMT -9)
StatusConfirmed
Magnitude6.4
Depth23.0 km
Epicenter latitude / longitude52.7655°N / 168.2667°W (Bering Sea, Alaska, United States)
Antipode52.766°S / 11.733°E
Shaking intensityStrong shaking near epicenter
Felt2 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoRecheschnoi (48 km / 30 mi)
Nearby towns and cities44 km (28 mi) ESE of Nikolski (pop: 18) | Show on map | Quakes nearby
169 km (105 mi) SW of Unalaska (pop: 4,490) | Show on map | Quakes nearby
170 km (105 mi) SW of Dutch Harbor (pop: 4,380) | Show on map | Quakes nearby
224 km (139 mi) SW of Akutan (pop: 1,040) | Show on map | Quakes nearby
394 km (245 mi) SW of False Pass (pop: 40) | Show on map | Quakes nearby
407 km (253 mi) ENE of Atka (pop: 64) | Show on map | Quakes nearby
452 km (281 mi) SW of Cold Bay (pop: 123) | Show on map | Quakes nearby
466 km (289 mi) WSW of King Cove (pop: 1,010) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds 0.9°C (34 F), humidity: 83%, wind: 7 m/s (13 kts) from NW
Estimated seismic energy released2.5 x 1014 joules (69.8 gigawatt hours, equivalent to 60036 tons of TNT or 3.8 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
6.423 km40 Km E of Nikolski, Alaska, USAUSGS
6.310 kmFox Islands, Aleutian Islands, USAGFZ
6.354 kmFOX ISLANDS, ALEUTIAN ISLANDS, USAEMSC
6.320 kmFox Islands, Aleutian Islands, United States [Sea: United States], USAINGV
6.452 kmFox Islands, Aleutian Islands, USAGeoAu
6.410 kmFox Islands, Aleutian Islands, USABMKG

Seismograms

Seismic station: Adak, Aleutian Islands, Alaska (ADK/IU network) | Distance from quake: 580 km / 360 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
Show more

User reports for this quake (4)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Contribute:
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Mark as helpful or interesting.
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Translate
Plainfield, Will, Illinois (5849.1 km ENE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / 1-2 s : Loud booming noise that was not created by any local agencies  
Homer (1279.4 km NE of epicenter) [Map] / not felt (reported through our app)
33 km of Cohoe, Kenai Peninsula, Alaska (1305 km NE of epicenter) [Map] / not felt (reported through our app)
Akutan (223.2 km NE of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 2-5 s (reported through our app)

Aftershocks

[More info]

Recorded aftershocks, latest first (23 quakes)

Date and timeMag
Depth
LocationDetails
May 30, 2021 08:50
1 year 28 weeks ago
2.4

49 km
30 Km E of Nikolski, AlaskaMore
May 20, 2021 09:00
1 year 29 weeks ago
2.7

24 km
Bering Sea, 98 mi SW of Unalaska, Aleutians West, Alaska, USAMore
May 20, 2021 09:00
1 year 29 weeks ago
2.5

25 km
59 Km ESE of Nikolski, AlaskaMore
May 6, 2021 02:10
1 year 31 weeks ago
3.6

35 km
Bering Sea, 105 mi SW of Unalaska, Aleutians West, Alaska, USAMore
Apr 7, 2021 19:31
1 year 35 weeks ago
4.8

44 km
Bering Sea, 144 mi SW of Unalaska, Aleutians West, Alaska, USAMore
Mar 28, 2021 04:06
1 year 37 weeks ago
2.6

48 km
47 Km ESE of Nikolski, Alaska, USAMore
Feb 10, 2021 03:32
1 year 43 weeks ago
2.0

3.1 km
53 Km W of Nikolski, Alaska, USAMore
Feb 8, 2021 12:34
1 year 43 weeks ago
3.9

28 km
Bering Sea, 57 mi S of Unalaska, Aleutians West, Alaska, USAMore
Jan 22, 2021 14:22
1 year 46 weeks ago
2.2

9.5 km
53 Km WSW of Nikolski, Alaska, USAMore
Jan 12, 2021 23:03
1 year 47 weeks ago
2.6

3.2 km
Bering Sea, 29 mi W of Nikolski, Aleutians West, Alaska, USAMore
Jan 9, 2021 05:22
1 year 48 weeks ago
4.3

35 km
Bering Sea, 30 mi E of Nikolski, Aleutians West, Alaska, USAMore
Jan 1, 2021 08:36
1 year 49 weeks ago
2.4

39 km
Bering Sea, 37 mi SW of Nikolski, Aleutians West, Alaska, USAMore
Jan 1, 2021 08:36
1 year 49 weeks ago
2.8

39 km
Bering Sea, 45 mi SW of Nikolski, Aleutians West, Alaska, USAMore
Dec 27, 2020 04:45
1 year 50 weeks ago
4.2

46 km
Bering Sea, 42 mi SW of Nikolski, Aleutians West, Alaska, USAMore
Dec 19, 2020 15:19
1 year 51 weeks ago
4.3

44 km
Bering Sea, 26 mi SE of Nikolski, Aleutians West, Alaska, USAMore
Dec 13, 2020 06:34
1 year 52 weeks ago
4.0

25 km
Bering Sea, 29 mi E of Nikolski, Aleutians West, Alaska, USAMore
Dec 11, 2020 10:25
1 year 52 weeks ago
4.1

46 km
Bering Sea, 19 mi E of Nikolski, Aleutians West, Alaska, USAMore
Dec 9, 2020 15:24
2 years ago
3.8

28 km
North Pacific Ocean, 33 mi SE of Nikolski, Aleutians West, Alaska, USAMore
Dec 1, 2020 23:35
2 years ago
4.4

39 km
Bering Sea, 27 mi SE of Nikolski, Aleutians West, Alaska, USAMore
Dec 1, 2020 23:05
2 years ago
2.5

26 km
North Pacific Ocean, 39 mi SE of Nikolski, Aleutians West, Alaska, USAMore
Dec 1, 2020 21:25
2 years ago
4.5

46 km
Bering Sea, 26 mi E of Nikolski, Aleutians West, Alaska, USAMore
Dec 1, 2020 17:02
2 years ago
2.9

20 km
North Pacific Ocean, 37 mi SE of Nikolski, Aleutians West, Alaska, USAMore
Dec 1, 2020 17:02
2 years ago
3.5

42 km
North Pacific Ocean, 29 mi SE of Nikolski, Aleutians West, Alaska, USAMore

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