Rural area in Northern California jolted by its biggest quake since 1940

No immediate damage or injuries were reported after the 5.6-magnitude quake in Mendocino County.

A rural area of Northern California experienced its strongest earthquake since 1940 on Wednesday morning, but it caused only mild shaking with no immediate reports of damage or injuries.

Limited time: Save 25% on NBC News subscription

Get exclusive reporting, live Q&As and ad-free reading.

The epicenter of the quake, with a preliminary magnitude of 5.6, was about 7 miles northwest of the agricultural town of Willits, according to the U.S. Geological Survey. It was widely felt, including in the coastal city of Fort Bragg. The initial quake was centered inland about 50 miles east of Fort Bragg at 8:10 a.m. PT, and the agency said it was about 5 miles deep.

The area in Mendocino County dotted with small, agricultural towns is 140 miles northeast of San Francisco.