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The 12 January 2010 Port-au-Prince, Haiti, earthquake (Mw= 7.0) triggeredtens of thousands of landslides. The purpose of this study is to investigatethe correlations of the occurrence of landslides and the thicknesses of their erosionwith topographic, geologic, and seismic parameters. A total of30 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 oflandslide 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-seatedlandslides and rock slides. These landslides were delineated using pre- andpost-earthquake high-resolution satellite images. Spatial distribution mapsand contour maps of landslide number density, landslide area percentage, andlandslide erosion thickness were constructed in order to analyze the spatialdistribution patterns of co-seismic landslides. Statistics of sizedistribution and morphometric parameters of co-seismic landslides werecarried out and were compared with other earthquake events in the world.Four proxies of co-seismic landslide abundance, including landslidescentroid number density (LCND), landslide top number density (LTND),landslide area percentage (LAP), and landslide erosion thickness (LET) wereused to correlate co-seismic landslides with various environmentalparameters. 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 Gardenfault, distance along the fault, and peak ground acceleration (PGA). Acomparison of these impact parameters on co-seismic landslides shows thatslope angle is the strongest impact parameter on co-seismic landslideoccurrence. Our co-seismic landslide inventory is much more detailed thanother inventories in several previous publications. Therefore, we carriedout comparisons of inventories of landslides triggered by the Haitiearthquake with other published results and proposed possible reasons for anydifferences. We suggest that the empirical functions between earthquakemagnitude and co-seismic landslides need to be updated on the basis of theabundant and more complete co-seismic landslide inventories recently available

natural hazards and earth system sciences

Landslides triggered by the 12 January 2010 Port-au-Prince, Haiti, &amp;lt;i&amp;gt;M&amp;lt;/i&amp;gt;&amp;lt;sub&amp;gt;w&amp;lt;/sub&amp;gt; = 7.0 earthquake: visual interpretation, inventory compiling, and spatial distribution statistical analysis