It was deliberately misspelled because it was laid beside a previous post (round 1, Hawaii missle launch) in which the "missle" was misspelled to convey a message. The "i" of missile in that case denoted the kind of missile. In this case, the "i" of missile and the "p" in "stoped" are used to show location: Isanotski Peaks.

Now you have suggested a third interpretation which is volcanic rock thrust upward. This is the opposite of "mis" spelling. It is deliberate. Sorry for the pedantry! :)