[artplumber]

Originally Posted by sammyg2

read about how the mantle/crust is more brittle east of the rockies so the same size earthquake in the Midwest is much worse than one on the west coast. just sumpthin to thunk about.

I think it's that the Madrid fault is in the middle of the north american plate, vs the San Andreas et al which are at the edges of the pacific / north american plates. With two plates (the edges of which are all cracked up) the distance of propagation is a lot less....