Strong mag. 5.5 earthquake - Bering Sea, 28 mi southeast of Nikolski, Aleutians West (CA) County, Alaska, USA, on Sunday, 29 Nov 2020 5:59 pm (GMT -11) -
This quake was likely a foreshock of the 6.4 quake Bering Sea, 28 mi southeast of Nikolski, Aleutians West (CA) County, Alaska, USA, 1 Dec 2020 7:22 am (GMT -9), which followed after 1 day 11 hours.
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Strong magnitude 5.5 earthquake at 34 km depth
30 Nov 05:10 UTC: First to report: GFZ after 11 minutes.
30 Nov 05:14: Now using data updates from USGS
30 Nov 20:06: Magnitude recalculated from 5.4 to 5.5. Hypocenter depth recalculated from 48.6 to 30.9 km (from 30 to 19.2 mi). Epicenter location corrected by 22 km (14 mi) towards SSE.
4 Dec 00:16: Hypocenter depth recalculated from 30.9 to 34.0 km (from 19.2 to 21 mi). Epicenter location corrected by 4.7 km (2.9 mi) towards E.
30 Nov 05:14: Now using data updates from USGS
30 Nov 20:06: Magnitude recalculated from 5.4 to 5.5. Hypocenter depth recalculated from 48.6 to 30.9 km (from 30 to 19.2 mi). Epicenter location corrected by 22 km (14 mi) towards SSE.
4 Dec 00:16: Hypocenter depth recalculated from 30.9 to 34.0 km (from 19.2 to 21 mi). Epicenter location corrected by 4.7 km (2.9 mi) towards E.
Date & time: 30 Nov 2020 04:59:09 UTC -
Local time at epicenter: Sunday, 29 Nov 2020 5:59 pm (GMT -11)
Magnitude: 5.5
Depth: 34.0 km
Epicenter latitude / longitude: 52.7214°N / 168.2949°W
(Bering Sea, Alaska, United States)Nearest volcano: Recheschnoi (48 km / 30 mi)
Nearby towns and cities:
45 km (28 mi) ESE of Nikolski (pop: 18) --> See nearby quakes!
174 km (108 mi) SW of Unalaska (pop: 4,490) --> See nearby quakes!
229 km (142 mi) SW of Akutan (pop: 1,040) --> See nearby quakes!
399 km (248 mi) SW of False Pass (pop: 40) --> See nearby quakes!
404 km (251 mi) E of Atka (pop: 64) --> See nearby quakes!
456 km (283 mi) SW of Cold Bay (pop: 123) --> See nearby quakes!
470 km (292 mi) WSW of King Cove (pop: 1,010) --> See nearby quakes!
Weather at epicenter at time of quake:
Snow
2.2°C (36 F), humidity: 92%, wind: 21 m/s (41 kts) from ENE
Primary data source: USGS (United States Geological Survey)Snow
2.2°C (36 F), humidity: 92%, wind: 21 m/s (41 kts) from ENEEstimated released energy: 1.1 x 1013 joules (3.12 gigawatt hours, equivalent to 2682 tons of TNT or 0.2 atomic bombs!) 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.
| Magnitude | Depth | Location | Source |
| M 5.5 | 34 km | 45 Km ESE of Nikolski, Alaska, USA | USGS |
| M 5.4 | 43 km | FOX ISLANDS, ALEUTIAN ISLANDS, USA | EMSC |
| M 5.5 | 24 km | 26 Km E of Nikolski, Alaska, USA | GFZ |
| M 5.5 | 46 km | Fox Islands, Aleutian Islands, USA | GeoAu |
User reports for this quake (2)
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Akutan (230.3 km NE of epicenter) [Map] / Light shaking (MMI IV) / 5-10 s (reported through our app)
Nikolski, AK / Light shaking (MMI IV) / rattling, vibrating / 10-15 s
Earlier earthquakes in the same area
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