On December 20, 2022, a magnitude 6.4 earthquake struck Ferndale, California in Humboldt County, United States at 10:34:25 UTC, or 2:34 a.m.

It came exactly a year after a 6.2 magnitude earthquake struck onshore in the Cape Mendocino area on December 20, 2021,[7] causing only minor damage.

The United States Geological Survey said the earthquake's depth, focal mechanism, and location suggest a likely source within the subducting Gorda plate.

[12] Broken windows, large cracks in buildings and power outages were reported in Humboldt County due to this aftershock, and some houses were badly damaged after being shaken from their foundations.

[15][16] Initial reports (via radio scanner traffic) indicated several houses were damaged, numerous gas leaks, and power outages in Rio Dell.

[24] Caltrans District 1 closed the Fernbridge over the Eel River on California State Route 211 due to four cracks which could cause the road itself to slide off.

Sensors at Fortuna detected the earthquake at 02:34 and issued warnings as far as the California–Oregon border, south of San Jose, past Shasta County and to Medford, Oregon.