An earthquake of magnitude 4.2 jolted Southern California's San Fernando Valley at around 4:30 am on Thursday, July 30.
According to the United States Geological Survey, the quake felt like a jolt, a pause, and then a bit more rocking.
It was centered near Pacoima, which is about 23 miles northwest of downtown Los Angeles.
Initially, the USGS reported a magnitude 4.5 tremor, but has since downgraded it.
(This is a developing story. More details awaited)