王伟,
刘静,
Vincent Godard 等
.2018.汶川地震同震滑坡物质在震区的滞留和运移及其对龙门山地形演化的影响. 地球物理学报,61(5): 1970-1983,doi: 10.6038/cjg2018M0074
WANG Wei,
LIU Jing,
Vincent Godard et al
.2018.Retention and transport of coseismic landslide sediments induced by the Wenchuan earthquake, and its implication for the topographic evolution of the Longmen Shan.Chinese Journal Of Geophysics,61(5): 1970-1983,doi: 10.6038/cjg2018M0074
Retention and transport of coseismic landslide sediments induced by the Wenchuan earthquake, and its implication for the topographic evolution of the Longmen Shan
WANG Wei1, LIU Jing1, Vincent Godard2, ZHANG JinYu1, XU Chong3, LI ZhiGang4, XU XinYue1, XU Qiang5, WANG Peng1, XIE KeJia6
1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China; 2. Aix-Marseille Université, CNRS, IRD, Collège de France, CEREGE, Aix en Provence 13100, France; 3. Key Laboratory of Active Tectonics and Volcano, Institute of Geology, China Earthquake Administration, Beijing 100029, China; 4. Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou 510275, China; 5. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China; 6. Henan Province Non-Ferrous Metals Geological Mineral Resources Bureau, Zhengzhou 450016, China
Abstract：The 2008 MW7.9 Wenchuan earthquake, China, ruptured the parallel Beichuan and Pengguan faults along the Longmen Shan, eastern margin of the Tibetan plateau, which induced a large amount of landslides, volume comparable to the coseismic uplift. However, there lacks systematic data and research to quantify the removal of these loose materials and temporal variation of fluvial erosion rates, which is central to understand the mass redistribution along the Longmen Shan and the role of such earthquake in building topography in active mountain ranges. Over the period of 2008—2013 after the Wenchuan earthquake, we collected a series of river sand samples along three tributaries of the Tuojiang River, including the Jianjiang, Shiting Jiang, and Mianyuan River, and measured the detrital quartz 10Be concentration. Together with published river sand 10Be concentration prior to the Wenchuan earthquake, our results show that:(1) Detrital 10Be concentration declined dramatically after the Wenchuan earthquake, which shows the dilution effect of co-seismic landslides; (2) Fluvial erosion rate in the upstream of Mianyuan River increased to 1.3~18.5 times of the pre-earthquake level, which indicates there occurs an obvious increase of erosion rates shortly after the earthquake; (3) Under the assumption of constant erosion rate, a simple calculation indicates the river will take at least 100~4000 years to move away these loose materials, comparable to the return time of Wenchuan-type large-magnitude earthquake in the Longmen Shan. Considering the effect of isostasy, we think that the Wenchuan earthquake will lead to a net material surplus in the Longmen Shan; and (4) The vertical motion and denudation at surface during the interseismic period and cosesimic rupture have different spatial pattern, which together control the topographic evolution of eastern Tibet.
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