Weak mag. 2.9 earthquake - North Pacific Ocean, 41 mi southwest of Eureka, Humboldt County, California, USA, on Thursday, 4 Mar 2021 9:08 am (GMT -8) -
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Weak magnitude 2.9 earthquake at 21 km depth
4 Mar 17:10 UTC: First to report: USGS after 2 minutes.
4 Mar 19:46: Magnitude recalculated from 3.0 to 2.9. Hypocenter depth recalculated from 20.3 to 20.5 km (from 12.6 to 12.7 mi). Epicenter location corrected by 2.2 km (1.4 mi) towards W.
4 Mar 19:46: Magnitude recalculated from 3.0 to 2.9. Hypocenter depth recalculated from 20.3 to 20.5 km (from 12.6 to 12.7 mi). Epicenter location corrected by 2.2 km (1.4 mi) towards W.
Update Thu, 4 Mar 2021, 17:15
Small tremor of magnitude 3.0 just reported 40 miles southwest of Eureka, California, United States3.0 quake 4 Mar 9:08 am (GMT -8)
Just 7 minutes ago, a 3.0-magnitude earthquake struck near Eureka, Humboldt County, California, USA. The tremor was recorded in the morning on Thursday 4 March 2021 at 9:08 am local time, at a shallow depth of 13 miles below the surface.
The event was filed by the United States Geological Survey, the first seismological agency to report it.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 3.0 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 Ferndale (pop. 1,400, 24 miles away), Rio Dell (pop. 3,400, 26 miles away), Fortuna (pop. 12,000, 29 miles away), Humboldt Hill (pop. 3,400, 35 miles away), Eureka (pop. 27,000, 40 miles away), Bayside (pop. 17,100, 45 miles away), and Arcata (pop. 17,800, 46 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.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 3.0 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 Ferndale (pop. 1,400, 24 miles away), Rio Dell (pop. 3,400, 26 miles away), Fortuna (pop. 12,000, 29 miles away), Humboldt Hill (pop. 3,400, 35 miles away), Eureka (pop. 27,000, 40 miles away), Bayside (pop. 17,100, 45 miles away), and Arcata (pop. 17,800, 46 miles away), the quake was probably not felt.
Earthquake data:
Date & time: 4 Mar 2021 17:08:32 UTC -
Local time at epicenter: Thursday, 4 Mar 2021 9:08 am (GMT -8)
Magnitude: 2.9
Depth: 20.5 km
Epicenter latitude / longitude: 40.291°N / 124.55333°W
(North Pacific Ocean, California, United States)Nearest volcano: Clear Lake (211 km / 131 mi)
Nearby towns and cities:
40 km (25 mi) SW of Ferndale (pop: 1,370) --> See nearby quakes!
44 km (28 mi) WSW of Rio Dell (pop: 3,390) --> See nearby quakes!
48 km (30 mi) SW of Fortuna (Humboldt County) (pop: 12,000) --> See nearby quakes!
65 km (40 mi) WNW of Redway (pop: 1,230) --> See nearby quakes!
66 km (41 mi) SSW of Eureka (Humboldt County) (pop: 27,000) --> See nearby quakes!
74 km (46 mi) SW of Bayside (Humboldt County) (pop: 17,100) --> See nearby quakes!
75 km (47 mi) SSW of Arcata (Humboldt County) (pop: 17,800) --> See nearby quakes!
82 km (51 mi) SSW of McKinleyville (Humboldt County) (pop: 15,200) --> See nearby quakes!
186 km (116 mi) W of Redding (pop: 91,600) --> See nearby quakes!
245 km (152 mi) NW of Windsor (Sonoma County) (pop: 27,500) --> See nearby quakes!
Weather at epicenter at time of quake:
Overcast Clouds
10.4°C (51 F), humidity: 71%, wind: 5 m/s (10 kts) from SE
Primary data source: USGS (United States Geological Survey)Overcast Clouds
10.4°C (51 F), humidity: 71%, wind: 5 m/s (10 kts) from SEEstimated released energy: 1.4 x 109 joules (392 kilowatt hours, equivalent to 0.338 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 |
| 2.9 | 21 km | 23km W of Petrolia, CA, USA | USGS |
| 3.0 | 20 km | OFFSHORE NORTHERN CALIFORNIA, 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 2.9, 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!
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