OCOTILLO, Calif. -- The U.S. Geological Survey said a desert area straddling the U.S.-Mexico border has been rattled by two earthquakes.

The first quake struck at 11:31 a.m. Friday in an area about 16 miles south of Mexicali, a Mexican border town. It's magnitude was measured at 4.7.

The second quake, a magnitude 4.1 temblor, hit three minutes later about 8 miles west of Ocotillo, an unincorporated community in east San Diego County.

San Diego Sheriff's Lt. William Donahue said there was no immediate damage or injury reports on the U.S. side of the border.

It's the second time this week the region has been shaken. On Tuesday, a magnitude 5.0 quake hit an area about 21 miles southeast of Mexicali. No injuries were reported in that temblor.