(CNN) – This weekend more than 600 small earthquakes have been registered in a rural area near the Salton Sea, in southern California, and the largest of them had a magnitude of 5.3, told CNN a geophysicist at the United States Geological Survey (USGS for its acronym in English).
Geophysicist Randy Baldwin said 603 tremors with a magnitude of at least 1 occurred in the area from Saturday until just before sunrise Sunday.
The tremors were centered near Calipatria, along the San Andrés fault and some 50 kilometers north of the border with Mexico, according to the USGS map.
The area is not heavily populated and has been known to have had “swarms (of earthquakes) in the past,” USGS seismologist Paul Caruso told CNN on Saturday.
A CNN team in Orange County said it did not feel any of Saturday’s earthquakes.
Four of the earthquakes were greater than magnitude 4, and 29 were greater than magnitude 3, Baldwin said.
On the other hand, two earthquakes of magnitude 5.9 struck in the Pacific Ocean about 140 and 160 km west of the coastal city of Gold Beach, Oregon, after 1 a.m. Pacific Time (PT) on Friday. , the USGS reported.
At least four earthquakes of magnitudes between 3.9 and 5.9 occurred in that area in the previous hours, according to the USGS.
CNN’s Alta Spells contributed to this report.