text: It depends, and it isn't just because of gravity....granted that determines that there is a landslide but it could be because of water seepage, causing the land mass to "Slump", also they can happen because of volcanoes that spew out so much lava that there is a huge chasm underneath where it used to be causing the cliff/mountain to just collapse. They don't just happen in one specific area. Although mountainous regions is always a good place to find them.