TOPSHOT - A crack on Highway 178 is seen as construction workers fix a broken water line south of Trona, after a 6.4-magnitude earthquake hit in Ridgecrest, California, on July 4, 2019. - Southern California was rocked by a 6.4-magnitude earthquake Thursday morning, the US Geological Survey said, with authorities warning that the temblor, the largest in two decades, might not be the day's last. (Photo by FREDERIC J. BROWN / AFP)