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| Titel |
Is co-seismic landslide clustering due to topographic site effects? |
| VerfasserIn |
Claire Rault, Patrick Meunier, Odin Marc, Niels Hovius |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250135624
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| Publikation (Nr.) |
 EGU/EGU2016-16512.pdf |
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| Zusammenfassung |
| We have documented the spatial and time variation of co-seismic landslides position along topographic
hillslopes within six strong shallow earthquakes (M w >6): the 1993 Finisterre, the 1994 Northridge, the
1999 Chichi, the 2004 Niigata, the 2008 Wenchuan, and the 2008 Iwate-Miyagi earthquakes. Landslides
rate increases with the duration and level of ground motion. In a mountain area in most of the case
the highest ground motion amplification occurs near or at the top of the crest due to the interaction of
upcoming wave with topography. As a consequence, co-seismic landslides should tend to occur near or
at the top of the ridge. The landslides where localized along slope using GIS mapping. We compare lo-
cation of co-seismic landslides to the one of pre- and post-seismic landslides catalogues, when available.
We show that a co-seismic signature of landslides position (i.e. crest clustering) is not systematically
obvious, we identified crest clustering pattern in only three epicentral areas. Clustering patterns show
no clear relation with lithology, topographic, or ground motion parameters. Hence earthquake-triggered
landslides in some cases, may be the results of complex combination of predispose (lithology, slope, etc)
and triggered (rainfall and earthquakes) parameters. |
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