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Engineering Geology Template
Abstract
Abstract
This paper presents the results of an extensive mapping of co-seismic
landslides triggered by the 2015 Gorkha earthquake in central Nepal. More than
19,332 landslides have been identified covering 61.5 km2 of land in about
20,500 km2 area of investigation using Google Earth imagery. Their spatial
distribution characteristics and relation to the triggering mechanism is
studied. Interesting regional localization and angular distribution
characteristics, more controlled by the rupture directivity is observed.
Seismic, geomorphic and lithological parameters that induce their susceptibility
is studied using two indices of landslide concentration: Landslide Area
Percentage (LAP) and Landslide Number Percentage (LNP) in comparison with %
area of each parameter classes. Positive correlation with the chosen triggering
parameters are observed but there are some significant differences in the
parameter values and distribution plots to co-seismic landslides in other parts
of world.
These results provide
valuable information about the slope response characteristics in case of
seismic activation in thrust faulting Himalayan landscapes, and this is
important in further researches on co-seismic landslide prediction models for
mountainous settlements, sediment yield studies and cascading landslide disasters
after major earthquakes.