Who knows? maybe the deadra did it during the oblivion crisis they may have implanted a special sigil stone into the mountian for when the mythic dawns "new age" arose but after a while of idle ness and other...factors it blew red mountian.

Nothing to suggest that. Everything we have says that RM erupted due to the fall of the Ministry (which fell due to the explosion of the Ingenium, which was necessary because the Dunmer lost their love for Vivec).