Three earthquakes have shaken Southern California, according to the U.S. Geological Survey.

The USGS's monitoring system places the epicenter of the earthquakes in the desert near Anza, about 100 miles southeast of Los Angeles.

One quake struck at 9:55 a.m. Monday and was initially estimated at magnitude 5.1 but that was quickly downgraded to 4.7. The other two were magnitude 4.6 and 3.0, according to the USGS.

The earthquakes were felt sharply in the local area and also rolled through downtown Los Angeles, San Diego and in Orange County. There are no immediate reports of damage in the region.

Susie Bride, a cashier at Cahuilla Mountain Market and Cafe in Anza, said the quake seemed to last awhile but didn't do any damage to the business.

'It kind of shook and then I thought, `God, is that an earthquake?' It kind of shook and then it rolled a little bit and then it shook again,' she said.

About 25 miles north of Anza, Palms Springs police Sgt. Harvey Reed said his department received no reports of damage or injuries. There were no other immediate reports of damage in the region.

Earthquakes of such magnitude are unlikely to do much harm in regions with modern building standards.

'It's extremely unlikely that there's damage from this earthquake,' said Lucy Jones, a seismologist with the U.S. Geological Survey in Pa.