Rock avalanche and resulting debris flow in Estero Parraguirre and Río Colorado, Region Metropolitana, Chile

Resumen

A rockslide took place at 10.33 a.m on November 29, 1987, starting from a location 4350 m above sea level on the western slope of Cerro Rabicano in the headwaters of Estero Parraguirre, a tributary of the Río Colorado, Regíon Metropolitana, Chile. It consisted mostly of limestone with gypsum and andesites, and was ~6.0 × 106 m3 in volume. The slide quickly became a rock avalanche, and later a hyperconcentrated debris flow with a volume of at least 15 × 106 m3 due to the incorporation of snow, ice, and sediments from the floor of...