Retention and transport of coseismic landslide sediments induced by the Wenchuan earthquake, and its implication for the topographic evolution of the Longmen Shan

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
	Godard, V (Godard, Vincent)2; Wang, W (Wang Wei)1; Liu, J (Liu Jing)1; Zhang, JY (Zhang JinYu)1; Xu, C (Xu Chong)3; Li, ZG (Li ZhiGang)4; Xu, XY (Xu XinYue)1; Xu, Q (Xu Qiang)5; Wang, P (Wang Peng)1; Xie, KJ (Xie KeJia)6
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2019-05-01
卷号	61 期号:5 页码:1970-1983
关键词	CATASTROPHIC DEBRIS FLOWS 13 AUGUST 2010 TIBETAN PLATEAU EASTERN MARGIN SURFACE UPLIFT ISOSTASY CANT CHINA SICHUAN MASS FAULTS
ISSN号	0001-5733
DOI	10.6038/cjg2018M0074
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.
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000432644000025
内容类型	期刊论文
源URL	[http://ir.itpcas.ac.cn/handle/131C11/8657]
专题	青藏高原研究所_图书馆
作者单位	1.China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing 100029, Peoples R China; 2.Aix Marseille Univ, Coll France, CEREGE, CNRS,IRD, IRD, F-13100 Aix En Provence, France; 3.China Earthquake Adm, Key Lab Act Tecton & Volcano, Inst Geol, Beijing 100029, Peoples R China; 4.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangdong Prov Key Lab Geodynam & Geohazards, Guangzhou 510275, Guangdong, Peoples R China; 5.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China; 6.Henan Prov Nonferrous Met Geol Mineral Resources, Zhengzhou 450016, Henan, Peoples R China.
推荐引用方式 GB/T 7714	Godard, V ,Wang, W ,Liu, J ,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]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2019,61(5):1970-1983.
APA	Godard, V .,Wang, W .,Liu, J .,Zhang, JY .,Xu, C .,...&Xie, KJ .(2019).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),1970-1983.
MLA	Godard, V ,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(2019):1970-1983.