i would dread this kind of event happening here and i think we'd see far different outcomes for a variety of structural reason that's really plague our preparedness efforts. >> craig fugate, let me bring you back in there. where would you say america is most vulnerable to something like this happening? where are the weaker areas in terms of fault lines? people tell me about the san andreas fault line being a potential next target for this kind of earthquake. do you know? do you have any way of predicting where the most likely places are that may suffer this kind of thing? >> sure. the u.s. geological survey does great mapping of where the seismic risk is. i think in that will cal they've done a lot since their past earthquakes to improve their building codes. we know a lot of places in this country, particularly the central u.s. and other areas, we have a lot of construction, older construction that does not meet or is mitigated against the seismic risk. so we would expect to see a