Sunday’s magnitude 4.1 earthquake ... Hills thrust fault system, which is underneath downtown L.A. and swaths of southeast L.A. County, the San Gabriel Valley and northern Orange County.
The epicenter of that quake was in a remote desert area east of Anza-Borrego Desert State Park, and weak shaking was felt as far away as San Diego, parts of Orange County, Temecula, the Coachella ...