“152 earthquakes by all magnitude,” seismologist Paul Caruso. said by phone from Golden, Colorado.
Caruso said the area was not densely populated and was known to have “past herds.”
The CNN crew in Orange County said they did not feel any tremors.
Calipatria is about 30 miles north of the Mexican border and about 140 miles east of San Diego.
The USGS reports two 5.9 magnitude earthquakes in the Pacific Ocean. It was about 89 miles and 98 miles west of the coastal town of Gold Beach, Oregon, after 1a.m. PT on Friday.
At least four earthquakes, ranging in size from 3.9 to 5.9, have occurred in that area in the previous few hours, according to the USGS.