Mine does the same thing on this land and on land 1. It seems to work very infrequently. Eventually, after some time, I got one volcano to go off.
This just proves my point even further: The game wasn't tested at all. Again, blatant incompetence.

Quoting:
RamdatDon't use the volcano.
Boy, that's a stupid response. It doesn't work with hurricane either, nor earthquake.
Basically, for an evil god, the land is relatively impossible.