Rainfall induced landslides are one of the
most frequent natural hazards on slanted terrains. They lead to significant
economic losses and fatalities worldwide. Most factors inducing shallow
landslides are local and can only be mapped with high levels of uncertainty at
larger scales.
This work presents an attempt to determine
slope instability using buffer and threshold techniques to downscale large areas and
minimize slope uncertainties at local scales, then in a second stage, logistic regression
is used to determine susceptibility at large scales. ASTER GDEM V2 is used for
topographical characterization of slope and buffer analysis.
Four static parameters (slope angle, soil
type, land cover and elevation) for 230 shallow rainfall-induced landslides
listed in a comprehensive landslide inventory for the continental United States
are examined. A delimiting buffer equivalent to 5, 25 or 50 km is created
around each landslide event facilitating the statistical analysis of slope
thresholds.
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