Moderate mag. 4.6 earthquake - North Pacific Ocean, 152 mi west of Eureka, Humboldt County, California, USA, on Wednesday, 27 Jan 2021 8:25 am (GMT -8) -

Moderate mag. 4.6 earthquake - North Pacific Ocean, 152 mi west of Eureka, Humboldt County, California, USA, on Wednesday, 27 Jan 2021 8:25 am (GMT -8)

Moderate magnitude 4.6 earthquake at 2 km depth

27 Jan 16:29 UTC: First to report: USGS after 4 minutes.
27 Jan 16:50: Magnitude recalculated from 3.7 to 4.2. Hypocenter depth recalculated from 5.0 to 1.2 km (from 3.1 to 0.7 mi). Epicenter location corrected by 305 km (189 mi) towards NW.
27 Jan 17:04: Magnitude recalculated from 4.2 to 4.6. Hypocenter depth recalculated from 1.2 to 2.2 km (from 0.7 to 1.4 mi). Epicenter location corrected by 24 km (15 mi) towards NNE.
Update Wed, 27 Jan 2021, 16:33
Magnitude 3.7 earthquake strikes near Punta Arenas, Mendocino County, United States
3.7 quake 27 Jan 8:25 am (GMT -8)
3.7 quake 27 Jan 8:25 am (GMT -8)
Just 7 minutes ago, a 3.7-magnitude earthquake struck near Punta Arenas, Mendocino County, USA. The tremor was recorded in the morning on Wednesday 27 January 2021 at 8:25 am local time, at a very shallow depth of 3.1 miles below the surface.
The event was filed by the United States Geological Survey (USGS), 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 3.7 earthquake as well.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Punta Arenas (pop. 450) located 31 miles from the epicenter.
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Earthquake data:

Date & time: 27 Jan 2021 16:25:14 UTC -
Local time at epicenter: Wednesday, 27 Jan 2021 8:25 am (GMT -8)
Magnitude: 4.6
Depth: 2.2 km
Epicenter latitude / longitude: 40.5053°N / 127.0326°W (North Pacific Ocean, California, United States)
Nearest volcano: Clear Lake (129 km / 80 mi)
Nearby towns and cities:
234 km (145 mi) W of Ferndale (pop: 1,370) --> See nearby quakes!
244 km (152 mi) W of Eureka (Humboldt County) (pop: 27,000) --> See nearby quakes!
252 km (157 mi) W of McKinleyville (Humboldt County) (pop: 15,200) --> See nearby quakes!
252 km (157 mi) W of Arcata (Humboldt County) (pop: 17,800) --> See nearby quakes!
253 km (157 mi) W of Bayside (Humboldt County) (pop: 17,100) --> See nearby quakes!
392 km (244 mi) W of Redding (pop: 91,600) --> See nearby quakes!
402 km (249 mi) WSW of Medford (Oregon) (pop: 79,800) --> See nearby quakes!
436 km (271 mi) WNW of Santa Rosa (pop: 175,000) --> See nearby quakes!
494 km (307 mi) NW of Richmond (pop: 109,700) --> See nearby quakes!
500 km (311 mi) NW of San Francisco (pop: 864,800) --> See nearby quakes!
Weather at epicenter at time of quake:
Clear Sky 5.9°C (43 F), humidity: 97%, wind: 7 m/s (13 kts) from S
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 5 x 1011 joules (139 megawatt hours, equivalent to 120 tons of TNT) More info
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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.
MagnitudeDepthLocationSource
M 4.62.2 km246km W of Petrolia, CA, USAUSGS
M 4.615 kmOFFSHORE NORTHERN CALIFORNIA, USAEMSC
M 4.610 kmOff Coast of N. California, USAGeoAu
M 4.810 kmOff Coast of N. California, USAGFZ

User reports for this quake (1)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Bay area (480.2 km SE of epicenter) [Map] / not felt
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Earlier earthquakes in the same area since 1900


Map of earlier quakes

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