Mudslide – La Conchita, CA. The Problem 4 placemark takes you to an ENE view of a steep, seaward-sloping face behind the flat, coastal sea terrace on which people have built homes. The placemark is positioned on the most recent, active mudslide, which is the infamous La Conchita mudslide. Why do you think this mudslide occurred? Choose one: A. The weight from numerous homes on the slope caused it to be unstable. B. Water from septic fields and sprinkler systems from homes above the slope lubricated the underlying rock layers. C. The exposed granite cliff experienced a major rockfall, leading to the collapse of the slope. D. Heavy rainfall saturated the soil and destabilized the over-steepened slope.