Carmen Rivera, 65, walks her dog, Ash, past a Ridgecrest, Calif., mobile home that was damaged in a 6.4 earthquake in July 2019. It was the Great California ShakeOut, an annual test of the state’s earthquake readiness and a reminder for Californians to be prepared for a major temblor. Get ready Start by signing up for Unshaken, The Times’ six-week …
