A magnitude-7.0 earthquake that rocked California and the Southwest has propelled the U.S. Geological Survey to focus its attention on a fault line it previously had ignored. The newly coined Lavic Lake fault, named for a dry lake bed near the Mojave Desert through which it broke ground, will now  become one of the most studied in the next few years. "We got a lot of information about this quake, a ton," USGS geologist Ken Hudnut said Sunday. The quake that struck at 2:46 a.m. Saturday near the remote desert town of Ludlow caused minor injuries during a passenger train derailment.