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Open-File Report 2005-1067

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Landslide Hazards at La Conchita, California

By Randall W. Jibson

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On January 10, 2005, a landslide struck the community of La Conchita in Ventura County, California, destroying or seriously damaging 36 houses and killing 10 people. This was not the first destructive landslide to damage this community, nor is it likely to be the last. On January 14, 2005, at the invitation of the California Geological Survey, I visited La Conchita with James O’Tousa, contract geologist for Ventura County, and Pamela Irvine, Janis Hernandez, and Terry Jones, all from the California Geological Survey. This report describes my field observations and provides a description of the La Conchita area and its landslide history, a comparison of the 1995 and 2005 landslides, and a discussion of continuing landslide hazards in the La Conchita area.

Version 1.0

Posted February 2005

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