Katrina sends quake-leery California scrambling to revise emergency plans Wed Sep 28,11:38 AM ET LOS ANGELES (AFP) - The humanitarian debacle spawned by Hurricane Katrina one month ago has badly shaken Californians and sent their leaders scrambling to update plans to cope with a long-feared catastrophic earthquake. Seismic experts warn there is a 62 percent chance of the "big one," measuring at least 6.7 on the Richter Scale, hitting San Francisco and a 70 percent chance of Los Angeles being brought to its knees by a quake with a magnitude of at least 7.2 in the next 30 years. Such...