Which of these landslides dammed a lake and caused flooding? SELECT THREE Thistle Madison Canyon La Conchita Yosemite Rock Falls Gros Ventre 4 1 point A slump (rotational landslide) is often preceded by ? Several minor earthquakes Cracks, possibly with some vertical displacement, occur upslope Wide fissures develop in the valley Volcanic eruptions Subsidence is seen at the bottom of the slope.