Landslides triggered by the 12 January 2010 Port-au-Prince, Haiti, Mw = 7.0 earthquake: visual interpretation, inventory compiling, and spatial distribution statistical analysisNatural Hazards and Earth System Science, 14, 1789-1818, 2014Author(s): C. Xu, J. B. H. Shyu, and X. XuThe 12 January 2010 Port-au-Prince, Haiti, earthquake (Mw= 7.0) triggered
tens of thousands of landslides. The purpose of this study is to investigate
the correlations of the occurrence of landslides and the thicknesses of their erosion
with topographic, geologic, and seismic parameters. A total of
30 828 landslides triggered by the earthquake covered a total area of 15.736 km2,
distributed in an area more than 3000 km2, and the volume of
landslide accumulation materials is estimated to be about 29 700 000 m3.
These landslides are of various types, mostly belonging to shallow disrupted landslides and rock falls, but also include coherent deep-seated
landslides and rock slides. These landslides were delineated using pre- and
post-earthquake high-resolution satellite images. Spatial distribution maps
and contour maps of landslide number density, landslide area percentage, and
landslide erosion thickness were constructed in order to analyze the spatial
distribution patterns of co-seismic landslides. Statistics of size
distribution and morphometric parameters of co-seismic landslides were
carried out and were compared with other earthquake events in the world.
Four proxies of co-seismic landslide abundance, including landslides
centroid number density (LCND), landslide top number density (LTND),
landslide area percentage (LAP), and landslide erosion thickness (LET) were
used to correlate co-seismic landslides with various environmental
parameters. These parameters include elevation, slope angle, slope aspect,
slope curvature, topographic position, distance from drainages, lithology,
distance from the epicenter, distance from the Enriquillo–Plantain Garden
fault, distance along the fault, and peak ground acceleration (PGA). A
comparison of these impact parameters on co-seismic landslides shows that
slope angle is the strongest impact parameter on co-seismic landslide
occurrence. Our co-seismic landslide inventory is much more detailed than
other inventories in several previous publications. Therefore, we carried
out comparisons of inventories of landslides triggered by the Haiti
earthquake with other published results and proposed possible reasons for any
differences. We suggest that the empirical functions between earthquake
magnitude and co-seismic landslides need to be updated on the basis of the
abundant and more complete co-seismic landslide inventories recently available.
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