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  2. 地质与地球物理研究所
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  4. 中国科学院页岩气与地质工程重点实验室
From surface morphologies to inner structures: insights into hypermobility of the Nixu rock avalanche, southern Tibet, China

文献类型：期刊论文

作者Zeng, Qingli1,2; Wei, Rongqiang1,2; McSaveney, Mauri3; Ma, Fengshan4; Yuan, Guangxiang5; Liao, Liye5
刊名LANDSLIDES
出版日期2020-08-05
页码19
ISSN号1612-510X
关键词Surface morphology Inner structure Basal shear zone Bulldozing Laminar flow Yadong-Gulu Rift
DOI10.1007/s10346-020-01503-6
英文摘要Large rock avalanches often result in many deaths and catastrophic damage to infrastructure far from source. No consensus has yet been reached on mechanisms causing their extraordinarily long runout since the first study at the Elm Slide, Switzerland. Much current understanding of rock avalanche kinematics and dynamics has been gained from observations of their surface morphologies and inner structures. Based on field surveys, high-resolution satellite image interpretation, and laboratory sieving, we analyzed the ancient, earthquake-induced Nixu rock avalanche in southern Tibet, China, which has unique exposures of both morphological features and inner structures of the deposits. The study revealed that (1) the Nixu rock avalanche probably could be disintegrated into three emplacement stages, transforming from an initial deep-seated rockslide into a large secondary debris avalanche, plus a relatively small third debris avalanche. The spreading of the secondary debris avalanche contributed to the subsequent long-runout propagation. (2) The morphological features observed in successive proximal to distal exposures (such as scarps, flowbands, transverse ridges, grid grooves, hummocks, and splash zones) reflect the change in stress-strain state of debris in motion from tension, to compression, to shear and tension. (3) The complicated inner structures exposed along river banks (such as jigsaw structures, fragmented clasts, inner shear zones, conjunction faults, convoluted lamination, decollements, sand injections, and intrusions) indicate the existence of a thin basal shear zone and a pressurized entrained substrate between the substrate and rock avalanche debris. (4) This suggests turbulent flow with bulldozing in the front, but a laminar flow under a simple shear model for the main body. (5) The analysis suggests that the rock avalanche's extraordinary mobility involves a combination of momentum transfer, substrate entrainment, liquefied basal shearing, internal shearing, and rock fragmentation.
WOS关键词INTERNAL STRUCTURE ; DEBRIS ; MOBILITY ; FRAGMENTATION ; EMPLACEMENT ; CONSTRAINTS ; ROCKSLIDES ; MECHANISM ; DEPOSITS ; FLOW
资助项目National Natural Science Foundation of China[41772382] ; Second Tibetan Plateau Scientific Exploration Research Program[2019QZKK0904] ; National Natural Science Foundation of China - Henan Joint Fund[U1704243] ; International Cooperation Program of Chinese Academy of Sciences[131551KYSB20180042] ; National Key Research and Development Program of China[2018YFC1505301]
WOS研究方向Engineering ; Geology
语种英语
出版者SPRINGER HEIDELBERG
WOS记录号WOS:000556220100001
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Exploration Research Program ; Second Tibetan Plateau Scientific Exploration Research Program ; National Natural Science Foundation of China - Henan Joint Fund ; National Natural Science Foundation of China - Henan Joint Fund ; International Cooperation Program of Chinese Academy of Sciences ; International Cooperation Program of Chinese Academy of Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Exploration Research Program ; Second Tibetan Plateau Scientific Exploration Research Program ; National Natural Science Foundation of China - Henan Joint Fund ; National Natural Science Foundation of China - Henan Joint Fund ; International Cooperation Program of Chinese Academy of Sciences ; International Cooperation Program of Chinese Academy of Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Exploration Research Program ; Second Tibetan Plateau Scientific Exploration Research Program ; National Natural Science Foundation of China - Henan Joint Fund ; National Natural Science Foundation of China - Henan Joint Fund ; International Cooperation Program of Chinese Academy of Sciences ; International Cooperation Program of Chinese Academy of Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Exploration Research Program ; Second Tibetan Plateau Scientific Exploration Research Program ; National Natural Science Foundation of China - Henan Joint Fund ; National Natural Science Foundation of China - Henan Joint Fund ; International Cooperation Program of Chinese Academy of Sciences ; International Cooperation Program of Chinese Academy of Sciences ; National Key Research and Development Program of China ; National Key Research and Development Program of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/97615]  
专题地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者Zeng, Qingli
作者单位1.Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.GNS Sci, POB 30368, Lower Hutt 9040, New Zealand
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
5.North China Univ Water Resources & Elect Power, Coll Resources & Environm, Zhengzhou 450045, Peoples R China
推荐引用方式
GB/T 7714		 Zeng, Qingli,Wei, Rongqiang,McSaveney, Mauri,et al. From surface morphologies to inner structures: insights into hypermobility of the Nixu rock avalanche, southern Tibet, China[J]. LANDSLIDES,2020:19.
APA Zeng, Qingli,Wei, Rongqiang,McSaveney, Mauri,Ma, Fengshan,Yuan, Guangxiang,&Liao, Liye.(2020).From surface morphologies to inner structures: insights into hypermobility of the Nixu rock avalanche, southern Tibet, China.LANDSLIDES,19.
MLA Zeng, Qingli,et al."From surface morphologies to inner structures: insights into hypermobility of the Nixu rock avalanche, southern Tibet, China".LANDSLIDES (2020):19.

入库方式： OAI收割

来源：地质与地球物理研究所

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