In early 2001, it was alleged that FEMA had been saying at its disaster readiness conferences that the three likeliest catastrophic events which could befall the U. S. were:
1) a major terrorist strike devastating New York
2) a major hurricane devastating New Orleans
3) a major earthquake devastating San Francisco
http://www.chron.com/disp/story.mpl/special/05/katrina/3335758.html
We know how the first two turned out but so far, of course, there have been no 9/11- or Katrina-level quakes. However, San Francisco does hold annual earthquake-readiness exercises called "Golden Guardian", which might be something to pay attention to.
http://www.govtech.com/gt/articles/102416
http://orise.orau.gov/nsem/ca-hseep.htm
http://www.homeland.ca.gov/hseep/golden_guardian/docs/Golden_Guardian_Brief_JAN_08.ppt