A U.S. Geological Survey map shows the location of a 4.0-magnitude earthquake that struck the San Diego County desert on Saturday, Dec. 22, 2012.

A U.S. Geological Survey map shows the location of a 4.0-magnitude earthquake that struck the San Diego County desert on Saturday, Dec. 22, 2012. (KABC Photo)

A magnitude-4.0 earthquake struck the San Diego County desert Saturday afternoon but there were no immediate reports of damage.

The quake struck at 1:37 p.m. PT and was centered 12 miles southwest of Ocotillo Wells, 19 miles southeast of Borrego Springs and 54 miles northeast of San Diego, according to the U.S. Geological Survey.

The quake initially clocked in at 3.9 but was upgraded a short time later.

The Associated Press contributed to this report.

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