Robert Graves, a geophysicist at USGS, reported the strongest earthquake with a magnitude of 5.5 occurred at 1:57 p.m. in a location about three miles northwest of the town of Brawley.This was preceded by a 5.3 magnitude tremor an hour and a half earlier.
More than 300 moderate to mild earthquakes and aftershocks hit the area near the southern end of the Salton Sea, Graves said via AP
"The type of activity that we're seeing could possibly continue for several hours or even days," Graves added.
the 5.5 tremor struck in the area 5km (3mi) NNW of Brawley, California and around 19km (12mi) N of Imperial, California.
“What we’re seeing is a classic Brawley seismic swarm,” USGS seismologist Lucy Jones said.
“Our system is choking on so many earthquakes,” she continued. “This area of California is deep soils, and we do not get as precise data as we do over the rest of the state, and that makes our data a little less precise.”
So far no casualties have been reported but power interruption was reported in some areas while some buildings have sustained minor damages.