Information on the earthquake: mag of light. Earthquake 3.6 – North Pacific Ocean, 81 km west of Eureka, Humboldt County, California, United States, Tuesday, December 7, 2021 at 7:04 p.m. (GMT -8)
Mild magnitude earthquake 3.6 to 27 km deep
Dec 8 03:07 UTC: First to report: USGS after 3 minutes.
Dec 8 06:51: Magnitude recalculated from 3.9 to 3.6. Depth of the hypocenter recalculated from 5.9 to 27.3 km (3.7 to 17 mi). Epicenter location corrected 36 km (23 mi) towards W.
Update Wed Dec 8 2021, 03:12
Magnitude 3.9 earthquake strikes near Ferndale, Humboldt County, California, United States
3.9 earthquake December 7 7:04 p.m. (GMT -8)
A 3.9 magnitude earthquake near Ferndale, Humboldt County, California, USA was reported just 7 minutes ago by the United States Geological Survey, considered the leading international agency and national body that monitors seismic activity in the United States. The earthquake occurred at a very shallow depth 3.7 miles below the epicenter in the early evening on Tuesday, December 7, 2021 at 7:04 p.m. local time. The exact magnitude, epicenter and depth of the quake could be revised in the coming hours or minutes, as seismologists review the data and refine their calculations, or when other agencies release their report.
Our monitoring service identified a second report from the Euro-Mediterranean Seismological Center (EMSC) which also listed the 3.9 magnitude earthquake.
Cities near the epicenter where the quake could have been felt as very weak tremors include Ferndale (1,400 residents) located 51 miles from the epicenter and Fortuna (12,000 residents) 57 miles away. In Rio Dell (3,400 inhabitants 58 km away), Humboldt Hill (3,400 inhabitants 58 km away), Hydesville (1,200 inhabitants 59 km away) and Pine Hills (3,100 inhabitants 60 km away), the earthquake did not probably not felt.
If you were or still are in this area during the earthquake help others with your comments and report it here.
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Earthquake data
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Date and hour : December 8, 2021 03:04:40 UTC –
Local time at epicenter: Tuesday December 7, 2021 7:04 p.m. (GMT -8)
Magnitude: 3.6
Depth: 27.3 km
Latitude / longitude of epicenter: 40.39083 ° N / 125.60717 ° W↗ 
(North Pacific Ocean, California, United States)
Antipode: 40.391 ° S / 54.393 ° E↗
Nearest volcano: Escanaba segment (173 km)
Nearby towns and villages:
115 km (72 mi) west of Ferndale (pop: 1370) -> Observe the earthquakes nearby!
125 km (78 mi) west of Fortuna (Humboldt County) (pop: 12,000) -> See nearby earthquakes!
128 km (79 mi) west of Rio Dell (pop: 3,390) -> Observe the earthquakes nearby!
130 km (81 mi) WW of Eureka (Humboldt County) (pop: 27,000) -> See nearby earthquakes!
139 km (86 mi) WW of Uniontown (Humboldt County) (pop: 17,800) -> Observe the earthquakes nearby!
140 km (87 mi) WW of Bayside (Humboldt County) (pop: 17,100) -> Observe the earthquakes nearby!
141 km (88 mi) WW of McKinleyville (Humboldt County) (pop: 15,200) -> See nearby earthquakes!
186 km (116 mi) northwest of Fort Bragg (Mendocino County) (pop: 7,290) -> See nearby earthquakes!
192 km (119 mi) southwest of Crescent City (Del Norte County) (pop: 6,770) -> See nearby earthquakes!
215 km (134 mi) SSO of Brookings (Curry County, Oregon) (pop: 6,480) -> Watch the earthquakes nearby!
Clouds covered
12.7 ° C (55 F), humidity: 94%, wind: 4 m / s (8 kts) from NNWMain data source: USGS (United States Geological Survey)
Estimated energy released: 1.6 x 10ten joules (4.4 megawatt hours, equivalent to 3.79 tonnes of TNT) More info
If you did NOT feel the earthquake although you are in the area, please report it! Your contribution is valuable to earthquake science, seismic risk analysis and mitigation efforts. You can use your device’s location or the map to show where you were during the earthquake. Thank you!
Data for the same earthquake reported by different agencies
Info: The more agencies report the same earthquake and publish similar data, the more confidence you can have in the data. It normally takes up to a few hours for the earthquake parameters to be calculated with near optimum accuracy.
| Mag. | Depth | Site | Source |
| 3.6 | 27 km | 76 km on the west of Petrolia, CA | USGS |
| 3.5 | 10 km | OFF NORTHERN CALIFORNIA | EMSC |
| 3.6 | 27 km | Off Northern California | RaspberryShake |
Previous earthquakes in the same region
Click here to search our database for previous earthquakes in the same area since 1900!