Light mag. 4.0 earthquake - Gulf of Alaska, USA, on Thursday, 11 Feb 2021 11:08 am (GMT -9) -
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Light magnitude 4.0 earthquake at 73 km depth
11 Feb 20:12 UTC: First to report: USGS after 3 minutes.
11 Feb 20:14: Hypocenter depth recalculated from 76.2 to 70.8 km (from 47 to 44 mi).
11 Feb 20:26: Magnitude recalculated from 3.9 to 4.0. Hypocenter depth recalculated from 70.3 to 73.4 km (from 44 to 46 mi). Epicenter location corrected by 2.9 km (1.8 mi) towards SSW.
11 Feb 20:14: Hypocenter depth recalculated from 76.2 to 70.8 km (from 47 to 44 mi).
11 Feb 20:26: Magnitude recalculated from 3.9 to 4.0. Hypocenter depth recalculated from 70.3 to 73.4 km (from 44 to 46 mi). Epicenter location corrected by 2.9 km (1.8 mi) towards SSW.
Update Thu, 11 Feb 2021, 20:18
Magnitude 4.0 earthquake strikes near Aleneva, Kodiak Island County, Alaska, USA4.0 quake Gulf of Alaska, USA, 11 Feb 2021 11:08 am (GMT -9)
A intermediate magnitude 4.0 earthquake was reported in the morning near Aleneva, Kodiak Island County, Alaska, USA.
According to the United States Geological Survey, the quake hit on Thursday 11 February 2021 at 11:08 am local time at an intermediate depth of 44 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.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 4.0 earthquake as well.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Aleneva (pop. 37) located 43 miles from the epicenter.
According to the United States Geological Survey, the quake hit on Thursday 11 February 2021 at 11:08 am local time at an intermediate depth of 44 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.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 4.0 earthquake as well.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Aleneva (pop. 37) located 43 miles from the epicenter.
Earthquake data:
Date & time: 11 Feb 2021 20:08:53 UTC -
Local time at epicenter: Thursday, 11 Feb 2021 11:08 am (GMT -9)
Magnitude: 4
Depth: 73.4 km
Epicenter latitude / longitude: 58.585°N / 153.4959°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Fourpeaked (22 km / 14 mi)
Nearby towns and cities:
68 km (42 mi) NNW of Aleneva (pop: 37) --> See nearby quakes!
105 km (65 mi) NNW of Kodiak Station (pop: 1,300) --> See nearby quakes!
109 km (68 mi) NW of Kodiak (pop: 6,250) --> See nearby quakes!
162 km (101 mi) SW of Homer (pop: 5,520) --> See nearby quakes!
163 km (101 mi) SW of Anchor Point (pop: 1,930) --> See nearby quakes!
239 km (148 mi) SSW of Kalifornsky (pop: 7,850) --> See nearby quakes!
253 km (157 mi) SSW of Kenai (pop: 7,660) --> See nearby quakes!
355 km (220 mi) SW of Anchorage (pop: 298,700) --> See nearby quakes!
375 km (233 mi) SW of Eagle River (pop: 24,800) --> See nearby quakes!
375 km (233 mi) SW of Eagle River (Anchorage) (pop: 24,800) --> See nearby quakes!
132 km (82 mi) N of Kodiak Island (pop: 13,600) --> See nearby quakes!
Weather at epicenter at time of quake:
Snow
2.2°C (36 F), humidity: 92%, wind: 19 m/s (37 kts) from E
Primary data source: USGS (United States Geological Survey)Snow
2.2°C (36 F), humidity: 92%, wind: 19 m/s (37 kts) from EEstimated released energy: 6.3 x 1010 joules (17.5 megawatt hours, equivalent to 15.1 tons of TNT) 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 |
| 4.0 | 73 km | 67 Km NNW of Aleneva, Alaska, USA | USGS |
| 4.4 | 86 km | KODIAK ISLAND REGION, ALASKA, USA | EMSC |
User reports for this quake (1)
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
200.2 km NNE of epicenter [Map] / not felt (reported through our app)
Earlier earthquakes in the same area since 1900
- Date / time UTC| Mag |Depth|Age|Distance| Details
- 09 Oct 1900 12:25| 7.9 |unknown|121 years ago|166km / 103mi| Gulf of Alaska, 10.2 mi SW of Old Harbor, Kodiak Island, Alaska, USA
- 07 Nov 1912 07:40| 7.3 |90km / 56mi|109 years ago|150km / 93mi| Gulf of Alaska, 57 mi W of Kodiak Island, Alaska, USA
- 23 Dec 1906 17:22| 7.3 |unknown|114 years ago|194km / 121mi| Kodiak Island Parish, 12 mi SE of Akhiok, Kodiak Island, Alaska, USA
- 24 Jan 2016 10:30| 7.1 |128km / 79mi|5 years ago|119km / 74mi| Gulf of Alaska, 24 mi E of Pedro Bay, Lake and Peninsula, Alaska, USA
- 06 Dec 1999 23:12| 7.0 |44km / 27mi|21 years ago|147km / 91mi| Kodiak Island Parish, 78 mi SW of Kodiak, Alaska, USA
- 04 Sep 1965 14:32| 7.0 |28km / 17mi|56 years ago|79km / 49mi| Gulf of Alaska, 13 mi N of Spruce Island, Kodiak Island, Alaska, USA
- 05 Dec 1912 12:27| 6.9 |90km / 56mi|108 years ago|124km / 77mi| Kodiak Island Parish, 2.9 mi S of Larsen Bay, Kodiak Island, Alaska, USA
- 10 Jun 1912 16:06| 6.9 |unknown|109 years ago|54km / 34mi| Gulf of Alaska, 14 mi E of Shaw Island, Kenai Peninsula, Alaska, USA
- 03 Nov 1945 22:09| 6.8 |50km / 31mi|76 years ago|145km / 90mi| Gulf of Alaska, 192 mi S of Anchorage, Alaska, USA
- 28 Jul 2001 07:32| 6.6 |132km / 82mi|20 years ago|73km / 45mi| Lake and Peninsula Parish, Alaska, USA
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