A magnitude 4.0 earthquake struck 6 miles north of Lake Pillsbury shortly after 5 a.m. The tremors hit the Mendocino National Forest area, but officials said no one got hurt. Experts showed a small chance of aftershocks this week. Many people felt the shaking, though the region stayed mostly safe.

The seismic event occurred approximately 6 miles north of Lake Pillsbury at a depth of roughly 6.5 miles, with tremors felt shortly after 5 a.m.

The regions most significantly impacted by the earthquake were situated within the Mendocino National Forest, positioned away from populated areas.

According to the USGS, the earthquake presented a 14% probability of generating an aftershock measuring at least magnitude 3, and a 2% probability of producing a magnitude 4.0 or greater earthquake within the following week.

There have been no reported casualties.