Friday, September 5, 2008

Mass movements


La Conchita, CA 1995 landslide


Unstable slopes mobilized by rain water caused a landslide and debris flow seen in Figure WM.5. The city lies on a narrow strip of coast 250m (800ft) wide between the shoreline and a 180 m (600ft) bluff above it. Extraordinary rains and rising groundwater levels caused the slope to fail, fortunately no one was killed. However, in 2005, another year of abnormally high rain fall caused the slope to fail again, this time burying structures and killing 10 people.