Identifying a large landslide with small displacements in a zone of coseismic tectonic deformation: The Villa Del Monte landslide triggered by the 1989 Loma Prieta, California, earthquake
Published:January 01, 2002
David K. Keefer, Edwin L. Harp, Gary B. Griggs, 2002. "Identifying a large landslide with small displacements in a zone of coseismic tectonic deformation: The Villa Del Monte landslide triggered by the 1989 Loma Prieta, California, earthquake", Catastrophic Landslides, Stephen G. Evans, Jerome V. Degraff
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The Villa Del Monte landslide was one of 20 large and complex landslides triggered by the 1989 Loma Prieta, California, earthquake in a zone of pervasive coseismic ground cracking near the fault rupture. The landslide was ~980 m long, 870 m wide, and encompassed an area of ~68 ha. Drilling data suggested that movement may have extended to depths as great as 85 m below the ground surface. Even though the landslide moved <1 m, it caused substantial damage to numerous dwellings and other structures, primarily as a result of differential displacements and internal Assuring. Surface cracks, scarps, and compression features delineating the Villa Del Monte landslide were discontinuous, probably because coseismic displacements were small; such discontinuous features were also characteristic of the other large, coseismic landslides in the area, which also moved only short distances during the earthquake. Because features marking landslide boundaries were discontinuous and because other types of coseismic ground cracks were widespread in the area, identification of the landslides required detailed mapping and analysis. Recognition that landslides such as that at Villa Del Monte may occur near earthquake-generating fault ruptures should aid in future hazard evaluations of areas along active faults.
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>This volume documents further advances in our knowledge of catastrophic landslides since the pioneering compilations of the late 1970s by Barry Voight. It provides a worldwide survey of catastrophic landslide events written by leading authorities. Catastrophic Landslides begins by drawing upon South America to dramatically illustrate the impact of these phenomena on human populations. The occurrence of catastrophic landslides, including site-specific insights, is shown through six events of the past 20 years. Several other chapters focus on the mechanisms involved with catastrophic landsides both in relation to geologic factors in a particular geographic area as well as to specific geologic processes.