Ejection landslide at northern terminus of beichuan rupture triggered by the 2008 Mw 7.9 Wenchuan earthquake

Yuan, Ren-Mao, Xu, Xi-Wei, Chen, Gui-Hua, Tan, Xi-Bin, Klinger, Yann and Xing, Hui-Lin (2010) Ejection landslide at northern terminus of beichuan rupture triggered by the 2008 Mw 7.9 Wenchuan earthquake. Bulletin Of The Seismological Society Of America, 100 5B: 2689-2699.

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Author Yuan, Ren-Mao
Xu, Xi-Wei
Chen, Gui-Hua
Tan, Xi-Bin
Klinger, Yann
Xing, Hui-Lin
Title Ejection landslide at northern terminus of beichuan rupture triggered by the 2008 Mw 7.9 Wenchuan earthquake
Journal name Bulletin Of The Seismological Society Of America   Check publisher's open access policy
ISSN 0037-1106
Publication date 2010-11-01
Year available 2010
Sub-type Article (original research)
DOI 10.1785/0120090256
Volume 100
Issue 5B
Start page 2689
End page 2699
Total pages 11
Place of publication Oakland, CA, U.S.A.
Publisher Seismological Society of America
Collection year 2011
Language eng
Subject 0404 Geophysics
Formatted abstract On 12 May 2008, the Mw 7.9 Wenchuan earthquake triggered widespread damaging landslides in many parts of the Longmen Shan area. Among these landslides, the Donghekou ejection landslide is quite special. It is located at the northeast end of the Beichuan rupture, and it has caused a great loss of life at the villages of Donghekou, Qinchuan, and Sichuan Provinces. Because of its special location, this ejection landslide differs from landslides caused by gravity or rainstorms only; the sliding surface is not uniformly continuous. Instead, two sections can be distinguished: an upper section with a step sliding surface and a lower section more gently dipping. The landslide started with material ejection caused by large local seismic acceleration, throwing rocks into the air with a parabolic trajectory before they fell back to the ground. In this paper, we analyze geologic and geomorphologic conditions that favored the occurrence of this landslide, and we introduce a simple tectonicgeomorphology model to explain the mechanism that led to the ejection landslide. We find that the location of the landslide zone, along with the domino-like ground tension cracks observed on both sides of the Beichuan rupture, is controlled by the propagation of the rupture. Our result also suggests that, in addition to local seismic shaking intensity, horizontal acceleration, and geomorphologic and geologic conditions, the vertical acceleration and the style of faulting could also play an important role in the occurrence of earthquake-triggered landslides.
Keyword Chi-Chi Earthquake
Slip
Sequence
Motion
Faults
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
Earth Systems Science Computational Centre Publications
 
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Created: Sun, 07 Nov 2010, 00:15:02 EST