Southern California rocked by strongest quake in two decades

A car drives past a crack in the road on Highway 178, south of Trona, California, after a 6.4-magnitude earthquake hit the south of the state

Southern California was rocked by its largest earthquake in two decades on Thursday, a 6.4-magnitude tremblor that caused "substantial damage" at a military facility but otherwise only minor injuries in the sparsely populated area.

The shallow quake, followed by dozens of aftershocks, struck in the Mojave Desert six miles (10 kilometers) from the small city of Ridgecrest at 10:33 am (1733 GMT).