Right- but now you're talking a different kind of economics. When the Nisqually quake hit, Puget Sound became a disaster area, Federal money flowed in and everyone rebuilt-ish eventually. The only outfit I know that got profoundly fucked was the club I was mixing at because, irony of ironies, we were in the midst of an earthquake retrofit for the week-and-a-half overlapping Feb 28 2001 so that building got fukt. But by and large? "X% of damage over Y% of area related to Z fault happens every W years" is doable. "X volcano erupting every Y decades doing Z damage" is less doable but still largely doable. And what do you get for your risk? People didn't settle Pompeii because they wanted to live dangerously, they settled Pompeii because recently-volcanic soil raised rippin' wine grapes. Still does. That there's a pretty new tool, by the way. I hadn't seen it before. It's probably worth a post of its own. Hint hint.