Regional Landslide-Hazard Evaluation Using Landslide Slopes, Western Wasatch County, Utah

Map and map database of susceptibility to slope failure by sliding and earthflow in the Oakland area, California

“…(Such forms of mass-movement as rock falls, topples, and shallow landslides occur in the steeper areas; debris-flow source areas, for example, peak at about 30° mean slope; Ellen, 1988.) Similar slope maxima are documented elsewhere (Lanyon and Hall, 1983;Jäger and Wieczorek, 1994;Brunori and others, 1996;Wójcik, 1997;Hylland and Lowe, 1997;Jennings and Siddle, 1998;Irigaray and others, 1999).…”

“…Geographic information systems (GIS) technology has freed susceptibility modeling from many of its qualitative limitations, and the computer-mapping of landslide susceptibility has spread worldwide (Aniya, 1985;others, 1992, 1995;Brunori and others, 1996;Fernández and others, 1996;Soeters and van Westen, 1996;van Westen and others, 1997;Cross, 1998;Dhakal and others, 2000). Although the multi-parameter estimation of susceptibility now is common, its effectiveness is limited in four respects: (1) the resulting maps usually cover small areas (Mora and Vahrson, 1994;Miller, 1995;Massari and Atkinson, 1999); (2) the maps require detailed information, some of it on many parameters, that can not be obtained economically for large areas (Jäger and Wieczorek, 1994;Miller, 1995;Fernández and others, 1996); (3) the maps express susceptibility qualitatively, on an ordinal (high, moderate, low) scale (Aniya, 1985;Hylland and Lowe, 1997;Turrini and Visintainer, 1998); and (4) the maps lack transparency, in that they result from complex computer-analyses wherein input parameters can be difficult to correlate with landslides occurrence and other field observations (Dhakal and others, 2000). The experiment reported here addresses these shortcomings.…”

“…Hillside materials are a major, if not the dominant, site control over the larger and deeper types of slope failure worldwide (Pachauri and Pant, 1992;Mora and Vahrson, 1994;Hylland and Lowe, 1997;Cross, 1998;Massari and Atkinson, 1999;Irigaray and others, 1999;Dhakal and others, 2000). In the San Francisco Bay region, the varied prevalence of landsliding with rock type and geologic structure is well documented (Cleveland, 1971;Brabb and others, 1972;Nilsen, Taylor, and Dean, 1976;Bechini, 1993;Haydon, 1995).…”

A biliography of geomorphometry, the quantitative representation of topography; supplement 2.0

“…Measurements, usually from field surveys or contour maps, are taken of such variables as landslide length, breadth, volume, planimetric shape, compass orientation, and height of head scarp. These quantities are compared with each other and with bedrock and soil properties, local hydrology, and other physical characteristics to isolate causative factors and model the physics of the process (Bhandari and Kotuwegoda, 1996;Hylland and Lowe, 1997).…”

Comparison of satellite and air photo based landslide susceptibility maps

“…While, such models are considered somewhat subjective in nature, because they rely upon the experience and knowledge of the researchers and their familiarity with the study area, GIS has strongly facilitated the development of these overlay models, largely because of the ease with which maps can be overlain and simple arithmetic procedures applied. Examples of these studies can be found in Hylland and Lowe (1997), Pachauri et al (1998), Turrini and Visintainer (1998), Dhakal et al (1999), Luzi and Pergalani (1999), Sarkar and Kanungo (2004), and Moreiras (2005).…”