A sign at the Anaz Borrego State Park near Borrego Springs. Courtesy University of California

A magnitude 3.1 earthquake rattled the arid eastern reaches of San Diego County Friday.

The temblor was recorded shortly before 10:30 a.m., centered in the area of Granite Mountain in Anza-Borrego Desert State Park, about 10 miles southeast of Julian, according to the U.S. Geological Survey.

The quake caused no reported damage or injuries.

–City News Service