An earthquake with a preliminary magnitude of 4.0 shook an agricultural area of southeastern California early Monday.
The quake struck at 7:57 a.m. south of the Salton Sea, about 7 miles (11.5 kilometers) north of Westmorland, the U.S. Geological Survey said.
The quake occurred at a depth of 4.1 miles (6.6 kilometers).
The area is primarily covered by vast farm fields.