@Victor I've been there. Did you know that Tahquitz is responsible for the earthquakes in the area, according to local lore?
He was an evil shaman who was exiled to a cave in the canyon. When he gets pissy about his fate, he stomps his feet in rage and the ground shakes.
@jjmacnab No, was not aware of story but guessing that American Indians living in that area had to deal with San Andreas fault nearby in one form or another...