conchita.landslide

conchita.landslide - USGS OF 2005-1067: Landslide Hazards...

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USGS OF 2005-1067: Landslide Hazards at La Conchita, California USGS Home Contact USGS Search USGS Open-File Report 2005-1067 About USGS / Science Topics / Maps, Products & Publications / Education / Publication: FAQ >> Pubs Warehouse > OF 05-1067 > On-line Report Landslide Hazards at La Conchita, California By Randall W. Jibson The PDF for the report is 10 MB This report has not been reviewed for stratigraphic nomenclature. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Table of Contents Introduction Setting of La Conchita Landslide History 1995 La Conchita Landslide 2005 La Conchita Landslide Comparison of 1995 and 2005 Landslides Continuing Hazards at La Conchita Conclusion References Figures Figure 1 Figure 2 Figure 3a Figure 3b Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 http://pubs.usgs.gov/of/2005/1067/508of05-1067.html (1 of 13) [8/14/2009 7:48:31 AM]
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USGS OF 2005-1067: Landslide Hazards at La Conchita, California (Click on the image to view it as a large JPG file) Introduction 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. Back to Table of Contents (Click on the image to view it as a large JPG file) Figure 1. Location map showing the La Conchita area (after O'Tousa, 1995). Back to Table of Contents http://pubs.usgs.gov/of/2005/1067/508of05-1067.html (2 of 13) [8/14/2009 7:48:31 AM]
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USGS OF 2005-1067: Landslide Hazards at La Conchita, California Setting of La Conchita La Conchita is located on the southern California coastline midway between Ventura and Santa Barbara (fig. 1) . The 11 ha (28 acre) community was first established in 1924 when subdivision created about 200 lots that mostly contain single family residences. La Conchita lies on a narrow coastal strip about 250 m (800 ft) wide between the shoreline and a 180 m (600 ft) high bluff having a slope of about 35°; above the top of the bluff is a gently rising terrace surface covered by avocado and citrus orchards (fig. 2) . Back to Table of Contents
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This note was uploaded on 12/28/2011 for the course GEOG 133 taught by Professor Leila during the Fall '09 term at UCSB.

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conchita.landslide - USGS OF 2005-1067: Landslide Hazards...

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