"Locked loaded and ready to roll." That's how one scientist recently described the San Andreas fault, meaning it is ready to spring a big quake on southern California at any moment. Generally, disaster preparedness is something many of us ignore -- especially newcomers to LA who haven't yet felt the earth move. But Chalk Repertory Theatre is thinking ahead — and over four weekends they are performing In Case of Emergency, a play about earthquake readiness. Is the play any good, and does it get the message out?