Ten seconds before a severe earthquake in California’s wine country caused the ground to rumble throughout the San Francisco Bay Area, a university lab in the city of Berkeley got the alert that the seismic waves were rolling its way. The lab is testing a prototype of an earthquake early-warning system that California is pursuing years after places like Mexico and Japan already have them up and running. Sunday’s rolling magnitude-6.0 earthquake near Napa has led to renewed calls for the system’s quick deployment in the state before another, possibly more destructive temblor strikes.