Kern County fire chief David Witt said: "We feel are going to have the upper hand on this". A 6.4 magnitude quake hit Southern California on Thursday at 10:33 am near the Searles Valley in San Bernardino County, the United States Geological Survey said.
The 6.4-magnitude quake struck just after 10.30am local time (6.30pm United Kingdom time) on Thursday near the town of Ridgecrest, about 150 miles northeast of Los Angeles. The largest one was a 5.8 quake in 1995.
Kern County Fire also tweeted that Ridgecrest Regional Hospital was being evacuated. "They were flying like missiles off the shelves", resident April Rodriguez in Trona, California, south of Ridgecrest, said on CNN.
Los Angeles International Airport said there were no immediate reports of damage.
Jones said there is a 1 in 20 chance that a bigger natural disaster will hit within the next few days.
The quake was the largest in Southern California since 1999 when the 7.1-magnitude Hector Mine quake struck the Twentynine Palms Marine Corps base, according to The Los Angeles Times.
USGS seismologist Lucy Jones said on CNN the area would be hit by many more aftershocks in the coming days, and could even be hit by a larger quake.
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Breedon said she had never felt a quake "like this long rolling" temblor, adding she was driving in her vehicle when it happened and immediately pulled up her emergency brake.
Breeden says the local senior center was holding a Fourth of July event when the quake hit.
People from Las Vegas to the Pacific Coast reported feeling a rolling motion and took to social media to report it. "Don't call for questions please", the Los Angeles Police Department said in a statement published on Twitter.
The City of Los Angeles explained that the app only alerts when the shaking is over M5.0 in L.A. County, and the shaking in L.A. on Thursday registered at M4.5.
Chuck Schlie, who was visiting Los Angeles for the first time with his family from St. Louis, said he was lying in bed at his hotel room in nearby Anaheim when he felt rumbling. The limits are meant to avoid false alarms.
"Because a larger one will happen eventually, we just don't know where or when".
"My sister was in the house and my dog, so we just got everyone outside and then it ended. It was pretty good shaking, so I'm out of breath", adding she and her family are OK.