Geology - Faulting

Lake Mead, USA, looking toward the Nevada side. As the reservoir filled, here and there the slopes of the surrounding canyon failed as they got soaked. I don't know the timescale offhand--I suspect they're still slowly sliding, but that most of the motion happened soon after the ground first got saturated. It's an example of geologic consequences from human activity! ;) Btw, with the current drought the lake in this area has pretty much returned to the original river channel.