Nation 7.1-magnitude earthquake felt in Southern California, could be largest in 20 years July 6, 2019July 6, 2019Marie McCain, Palm Springs Desert SunComments Off on 7.1-magnitude earthquake felt in Southern California, could be largest in 20 years The epicenter of Friday's powerful quake was 11 miles north-northeast of Ridgecrest, according the U.S. Geological Survey.