WESTMORLAND, Calif. (AP) — An earthquake with a preliminary magnitude of 4.0 has shaken a rural area of southeastern California.

The U.S. Geological Survey says the quake struck at 7:57 a.m. Monday south of the Salton Sea, about 7 miles north of Westmorland.

The quake occurred at a depth of 4.1 miles.

The area is primarily covered by vast farm fields.