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| Titel |
Regional distribution of landslides induced by the 2004 Ch¯u etsu earthquake. |
| VerfasserIn |
Patrick Meunier, Taro Ushida, Niels Hovius |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250041839
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| Zusammenfassung |
| The 2004 Ch¯u etsu earthquake (Mw=6.9) triggered several thousands landslides in the
epicentral area, mainly in the Higashiyama Hills. Following the work of Meunier et al.
(2007)1, we investigate the regional pattern of the landslides with regards to the seismological
data. The landslide density (area of landsliding per unit area) is now computed along the
radial direction starting from either the hypocenter or the rupture plane. We show
that the landslide density correlates well with both Peak ground velocity and Peak
ground acceleration maps provided by the USGS2. The quality of the correlations is
studied by a spatial residual analysis. The regional distribution of landsliding can thus
be expressed as a function of the distance to either the hypocenter or the rupture
plane. Both expressions includes a source term, an attenuation term and a term that
accounts for the variation of the radiation pattern. This works brings new insights on
landslide triggering by seismic waves and more particularly, the interaction between the
form of the wave, its direction of propagation and the geometrical properties of
the surface (orientation of the surface, orientation of the geological structure) it
shakes.
1 Regional patterns of earthquake-triggered landslides and their relation to ground motion, P.
Meunier, N. Hovius, J. Haines, Geophys. Res. Lett., 34, 2007.
2 http://earthquake.usgs.gov/earthquakes/shakemap/ |
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