According to the United States Geological Survey (USGS), a magnitude 5.4 earthquake struck southern California in the Chino Hills area (San Bernardino County) near Los Angeles California, east of Highway 142. It occurred at about 11:42 a.m. (PDT), and lasted approximately one minute.
As many as thirty-four aftershocks registering a magnitude 3.8 and lower have been recorded since the initial earthquake. The earthquake originally registered a 5.8, but was later reduced to a 5.4 by the USGS.
