Government officials are evaluating and revising disaster plans around the United States in the wake of Hurricane Katrina, just as they did after the Sept. 11 terrorist attacks. While war and automobiles kill more people than nature, find out what natural disasters top scientists’ worry lists. #10 Pacific Northwest Megathrust Earthquake Geologists know it’s just a matter of time before another 9.0 or larger earthquake strikes somewhere between Northern California and Canada. The shaking would be locally catastrophic, but the biggest threat is the tsunami that would ensue from a fault line that’s seismically identical to the one that...