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.

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