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| Titel |
Landslides triggered by the January 12, 2010 Port-au-Prince, Haiti Mw 7.0 earthquake |
| VerfasserIn |
Chong Xu |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250089023
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| Publikation (Nr.) |
 EGU/EGU2014-3207.pdf |
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| Zusammenfassung |
| The January 12, 2010 Port-au-Prince, Haiti earthquake (Mw 7.0) triggered tens of
thousands of landslides. The purpose of this study is to investigate correlations of the
occurrence of landslides and its erosion thickness with topographic factors, seismic
parameters, and distance from roads. A total of 30,828 landslides triggered by the
earthquake cover a total area of 15.736 km2, and the volume of landslide accumulation
materials is estimated to be about 30,000,000 m3, and throughout an area more
than 3,000 km2. These landslides are of various types, mainly in shallow disrupted
landslides and rock falls, and also including coherent deep-seated landslides, shallow
disrupted landslides, rock falls, and rock slides. These landslides were delineated
using pre- and post-earthquake high-resolutions satellite images. Spatial distribution
maps and contour maps of landslide number density, landslide area percentage,
and landslide erosion thickness were respectively constructed in order to more
intuitive to discover the spatial distribution patterns of the co-seismic landslides.
Statistics of size distribution and morphometric parameters of the co-seismic landslides
were carried out and were compared with other earthquake events. Four proxies of
co-seismic landslides abundances, including landslides centroid number density (LCND),
landslide top number density (LTND), landslide area percentage (LAP), and landslide
erosion thickness (LET) were used to correlate the co-seismic landslides with various
landslide controlling parameters. These controlling parameters include elevation, slope
angle, slope aspect, slope curvature, topographic position, distance from drainages,
stratum/lithology, distance from the epicenter, distance from the Enriquillo-Plantain Garden
fault, distance along the fault, and peak ground acceleration (PGA). Comparing of
controls of impact parameters on co-seismic landslides show that slope angle is the
strongest impact parameter on co-seismic landslides occurrence. In addition, it should
be noted that the co-seismic landslides of our inventories is much more detailed
than other inventories in several previous publications. Therefore, comparisons of
inventories of landslides triggered by the Haiti earthquake with other published results
were carried out and the reasons of such differences were presented. We suggest it
should not be limited by past empirical functions between earthquake magnitude
and co-seismic landslides or it is necessary to update the past empirical functions
based on more and more latest and complete co-seismic landslide inventories. This
research was supported by the National Science Foundation of China (41202235) |
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