Light mag. 2.8 earthquake - Gulf of Alaska, 68 mi south of Kodiak Island, Alaska, USA, on Thursday, 4 Mar 2021 10:38 pm (GMT -9) -
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Light magnitude 2.8 earthquake at 0 km depth
5 Mar 07:43 UTC: First to report: USGS after 5 minutes.
5 Mar 07:49: Magnitude recalculated from 2.9 to 3.0. Hypocenter depth recalculated from 10.5 to 11.6 km (from 6.5 to 7.2 mi). Epicenter location corrected by 9.7 km (6 mi) towards NNW.
5 Mar 22:18: Magnitude recalculated from 3.0 to 2.8. Hypocenter depth recalculated from 11.6 to 0.1 km (from 7.2 to 0.1 mi). Epicenter location corrected by 5.5 km (3.4 mi) towards ESE.
5 Mar 07:49: Magnitude recalculated from 2.9 to 3.0. Hypocenter depth recalculated from 10.5 to 11.6 km (from 6.5 to 7.2 mi). Epicenter location corrected by 9.7 km (6 mi) towards NNW.
5 Mar 22:18: Magnitude recalculated from 3.0 to 2.8. Hypocenter depth recalculated from 11.6 to 0.1 km (from 7.2 to 0.1 mi). Epicenter location corrected by 5.5 km (3.4 mi) towards ESE.
Update Fri, 5 Mar 2021, 07:54
Small magnitude 3.0 earthquake 38 miles southeast of Akhiok, Alaska, United States3.0 quake 4 Mar 10:38 pm (GMT -9)
Just 15 minutes ago, a 3.0-magnitude earthquake struck near Akhiok, Kodiak Island County, Alaska, USA. The tremor was recorded late at night on Thursday 4 March 2021 at 10:38 pm local time, at a shallow depth of 7.2 miles below the surface.
The event was filed by the United States Geological Survey, the first seismological agency to report it.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 3.0 earthquake as well.
According to preliminary calculations, we do not expect that the quake was felt by many people and did not cause any damage. In Akhiok (pop. 72, 38 miles away), the quake was probably not felt.
The event was filed by the United States Geological Survey, the first seismological agency to report it.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 3.0 earthquake as well.
According to preliminary calculations, we do not expect that the quake was felt by many people and did not cause any damage. In Akhiok (pop. 72, 38 miles away), the quake was probably not felt.
Earthquake data:
Date & time: 5 Mar 2021 07:38:51 UTC -
Local time at epicenter: Thursday, 4 Mar 2021 10:38 pm (GMT -9)
Magnitude: 2.8
Depth: 0.1 km
Epicenter latitude / longitude: 56.4199°N / 153.7349°W
(Gulf of Alaska, Alaska, United States)Nearest volcano: Unnamed 57.87°N/155.42°W (187 km / 116 mi)
Nearby towns and cities:
64 km (40 mi) SSE of Akhiok (pop: 72) --> See nearby quakes!
91 km (57 mi) SSW of Old Harbor (pop: 221) --> See nearby quakes!
125 km (78 mi) S of Larsen Bay (pop: 88) --> See nearby quakes!
135 km (84 mi) SSE of Karluk (pop: 37) --> See nearby quakes!
155 km (96 mi) SSW of Womens Bay (pop: 719) --> See nearby quakes!
159 km (99 mi) SW of Chiniak (pop: 47) --> See nearby quakes!
165 km (102 mi) SSW of Kodiak Station (pop: 1,300) --> See nearby quakes!
169 km (105 mi) SSW of Port Lions (pop: 197) --> See nearby quakes!
172 km (107 mi) SSW of Kodiak (pop: 6,250) --> See nearby quakes!
189 km (117 mi) SSW of Aleneva (pop: 37) --> See nearby quakes!
Weather at epicenter at time of quake:
Light Snow
0.9°C (34 F), humidity: 93%, wind: 13 m/s (26 kts) from SSE
Primary data source: USGS (United States Geological Survey)Light Snow
0.9°C (34 F), humidity: 93%, wind: 13 m/s (26 kts) from SSEEstimated released energy: 1 x 109 joules (278 kilowatt hours, equivalent to 0.239 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 |
| 2.8 | 0.1 km | 64 Km SSE of Akhiok, Alaska, USA | USGS |
| 3.0 | 12 km | KODIAK ISLAND REGION, ALASKA, USA | EMSC |
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
At magnitude 2.8, this quake might have been felt very close to the epicenter and under calm conditions.There are no user reports for this quake yet. If you felt it be the first to report it!
Earlier earthquakes in the same area
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