Map shows location of earthquake and aftershocks
U.S. Geological Survey map shows the location of the main earthquake and series of aftershocks.

A major 6.4-magnitude earthquake struck the Mojave Desert near the town of Ridgecrest on Thursday, causing damage and shaking much of Southern California.

It was felt by some in San Diego County, according to social media posts, with one Facebook video showing swaying ceiling lamps.

It was the strongest quake to hit the region since Oct. 16, 1999, when a 7.1-magnitude quake struck near  the Twentynine Palms Marine Corps base.

No injuries were initially reported from Thursday’s quake, which struck just before 10:34 a.m. about 10 miles northeast of Ridgecrest. The epicenter was in San Bernardino County near the Kern County line. The China Lake Naval Weapons Station is located nearby.

About an hour after the quake hit, local authorities were surveying damage and moving rescue crews and equipment into the area.

The quake was widely felt in the City of Los Angeles, and authorities urged residents not to call 9-1-1 unless there were injuries or damage.

Shaking was was experienced throughout Los Angeles, Orange and Riverside Counties, and as far south as National City and Imperial Beach in San Diego County, according to the U.S. Geological Survey.

“At work in downtown San Diego on the fourth floor the whole building shook,” one user wrote on Facebook.

“Swaying on the 26th floor downtown was not fun. Definitely felt it,” reported another.

“Rockin’ and rollin’ here in Oceanside,” chimed in a third.

More than two dozen aftershocks were felt, continuing for several hours, the USGS reported.

Hours before addressing National Mall crowds from the Lincoln Memorial, President Trump noted the quake, saying he’d been briefed and “All seems to be very much under control!”

Damage to state Route 78 was shared via Twitter.

Updated at 4:37 p.m. July 4, 2019

— From Staff and Wire Reports

Chris Jennewein is founder and senior editor of Times of San Diego.