The Las Colinas landslide was one of thousands of landslides triggered by the January 13th El Salvador earthquake (M_W 7.6) in early 2001. The landslide was highly destructive. It led to the death of ∼585 people when it swept into a residential area of Santa Tecla, a suburb of San Salvador. The landslide originated from the top of a steep escarpment and involved pyroclastic deposits (silty sands and sandy silts) interbedded with paleosol horizons. The initial volume of the landslide was only ∼130,000 m³. The runout distance of the landslide, which developed into a rapid flowslide, was...