What happens when The Really Big One hits?

[SixToe]

Shoulda let more of that beautiful water flow down south from up north instead of saving the snail dartereels and weeds. If you had more of that water the ground wouldn't dry up and crack and then it wouldn't get earthquakey when the cracks get too deep. That's what happens when it dries out. Cracks and also fires, which could be avoided by just raking the forests and hills.