A magnitude 4.0 earthquake struck off the coast of San Diego this morning. There were no immediate reports of damage or injuries.

The quake struck 7:34 a.m. about 30 miles west of La Jolla and 37 miles west of San Diego, according to the U.S. Geological Survey. The quake originated about 12 miles underground, the USGS estimated.

The shaker was felt across San Diego County including Oceanside, Escondido, Vista and Carlsbad, as well as in Temecula, Laguna Niguel and Ladera Ranch.

The USGS classified the quake as "light."

-- Shelby Grad