Some people alerted of shaking ahead of 5.2 SoCal quake. What to know about the MyShake app  KABC-TVDozens of earthquakes in California: Is a bigger one brewing?  USA TODAYMassive boulder fell on 5 Freeway moments after 5.2 quake; stopped lanes through Grapevine  KTLA Los AngelesMagnitude 5.2 earthquake rattles Southern California followed by over 50 aftershocks  Fox Weather Lanes reopened after blocked by large boulder on SB I-5 at Grapevine Road: CHP  Bakersfield Now