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| Titel |
What controls the size of earthquake-triggered landslides ? |
| VerfasserIn |
Patrick Meunier, Taro Ushida, Niels Hovius |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250055516
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| Zusammenfassung |
| We documented the regional pattern of the landslides triggered by the 2004 Ch¯u etsu
earthquake (Mw=6.9, Japan). We use the relationship of Meunier et al (2007) describing the
decay of the landslide density with distance to the seismic source to infer the best source
location from the landslide pattern. The source we found is in good agreement with the patch
of high slip inverted from seismic records. However, this inference to the best source is not
valid when using a sub-dataset composed of the smallest landslides only. The critical size
above which a correct source location appears (i.e. at the correct location) corresponds
to:
The critical landslide size above which a trend (decay) appears in the plot of the
size of individual landslide versus the distance to the source.
The maximum in the distribution of the landslides size (Pdf).
According to Stark and Guzzetti (2009), this maximum is also the critical size above which
the landslides affect the bedrock. These results suggest that while the size of the
bedrock landslides depends in the seismic energy released by the earthquake, the soil
ruptures, though triggered by the wave, are controlled by the local properties of the
substrate. This result also justifies the choice of a landslide density computed in
cumulated area rather than in number for the description of the regional pattern of
landsliding.
Regional patterns of earthquake-triggered landslides and their relation to ground motion,
P. Meunier, N.Hovius, J. Haines, Geophys. Res. Lett., 34, 2007.
Landslide rupture and the probability distribution of mobilized debris volumes, C.P.,
Stark, and F. Guzzetti, J. Geophys. Res., 114, F00A02, 2009. |
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