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Epicenter is in the Mojave desert in San Bernardino County. #Quake #California
Friends and relatives in Las Vegas, Nevada are posting on social media that they felt the #quake there.
Strongest shaking from the southern #California #quake felt in Searles Valley, according to initial reports.
Info on the #quake from a seismologist:
"Varying degrees of damage" to some buildings and roads in San Bernardino County, #California from the #quake, according to local officials.
"The earthquake is near China Lake and Ridgecrest," says @DrLucyJones. "It is a sparsely inhabited area."
"We've had a lot of aftershocks" and there'll be a lot more, adds @DrLucyJones, speaking to reporters. Chance of a M5 aftershock this afternoon is "greater than 50/50."
Today's #quake doesn't increase nor decrease San Andreas Fault #quake risk, according to @DrLucyJones.
Seismologist Robert Graves of @USGS tells reporters #ShakeAlert early warning system did detect the imminent quake "but the signal did not go out" to alert the public.
About a 1 in 20 chance that the area rocked today in San Bernardino County "will be having an even bigger quake in the coming days," according to #DrLucyJones.
Structure fires reported in and around Ridgecrest, #California following M6.4 #quake.
Power lines are down and water mains are also broken in San Bernardino County, #California as a result of the powerful #quake. 
More damage details on the largest southern California #quake since 1999.
Details on why #ShakeAlertLA system didn't send out an alert:
More on some minor utility services disruptions in the LA area from the M6.4 #quake.
Updated @USGS information has the M6.4 #quake at a depth of just 4km. earthquake.usgs.gov/earthquakes/ev…
Reaction from @POTUS (who has returned to the @WhiteHouse from his golf club in Sterling, Virginia):
"It looks like we might be seeing two different faults" from today's M6.4 #quake and aftershocks, says @DrLucyJones, briefing reporters again.
"We expect to be seeing a lot of earthquakes today and some of them could be damaging," warns @DrLucyJones. "I think there will be a magnitude 5 (aftershock) today."
Threshold for #ShakeAlertLA to be lowered after today's #quake:
Aftershocks can be tracked here: scedc.caltech.edu/recent/Maps/11…
One hospital evacuated after #quake.
