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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 Wei; Liu Jing; Godard, Vincent; Zhang JinYu; Xu Chong; Li ZhiGang; Xu XinYue; Xu Qiang; Wang Peng; Xie KeJia
通讯作者	Wang, W (通讯作者)
发表日期	2018
ISSN	0001-5733
起始页码	1970
结束页码	1983
卷号	61 期号:5
英文摘要	The 2008 M(w)7. 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 Be-10 concentration. Together with published river sand Be-10 concentration prior to the Wenchuan earthquake, our results show that; (1) Detrital Be-10 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 similar to 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 similar to 4000 years to move away these loose materials, comparable to the return time of Wenchuan-type largemagnitude 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.
关键词	CATASTROPHIC DEBRIS FLOWS 13 AUGUST 2010 TIBETAN PLATEAU EASTERN MARGIN SURFACE UPLIFT ISOSTASY CANT CHINA SICHUAN MASS FAULTS
英文关键词	Longmen Shan; Wenchuan earthquake; Co-seismic landslides; Fluvial processes; Topographic evolution
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000432644000025
来源期刊	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259344
推荐引用方式 GB/T 7714	Wang Wei,Liu Jing,Godard, Vincent,et al. Retention and transport of coseismic landslide sediments induced by the Wenchuan earthquake, and its implication for the topographic evolution of the Longmen Shan[J]. 中国科学院青藏高原研究所,2018,61(5).
APA	Wang Wei.,Liu Jing.,Godard, Vincent.,Zhang JinYu.,Xu Chong.,...&Xie KeJia.(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-CHINESE EDITION,61(5).
MLA	Wang Wei,et al."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-CHINESE EDITION 61.5(2018).