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Nature and timing of a prehistoric giant landslide on the eastern margin of the Tibetan Plateau

Journal of Mountain Science 2020年第6期17卷 1438-1451页

作者： ZHAO Xun WANG Yun-sheng WANG Shi-yuan ZHAO Bo ZENG Lu LIU Yu FENG Qian-qian State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China Sichuan Earthquake Agency Chengdu 610041China Key Laboratory of Mountain Hazards and Earth Surface Processes Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China

Studying the characteristics of a prehistoric giant landslide and ascertaining its relationship with palaeo-seismic events could provide useful information on the role of regional tectonic activities in hillslope ***,a giant palaeoseismic landslide(GPSL),namely,the Luanshibao(LSB)landslide,located on the eastern margin of the Qinghai-Tibet Plateau,was investigated to ascertain its characteristics and occurrence *** relationship between occurrence age and palaeoseismic episodes was also discussed by using 14 C dating on the adjacent active faults,including the regional Yidun-Litang-Dewu(YD-LT-DW)fault zone,which crossed the LSB *** dating of multiple samples acquired from palaeo-seismic trenches revealed that at least 5 palaeo-seismic episodes had occurred in the vicinity of the LSB landslide over the last 5000 *** occurrence age of the LSB landslide(3635±387 a BP)coincides with palaeo-seismic episode I,and the LSB landslide is convincingly inferred to have been triggered during episode I,which reached a seismic intensity(Chinese scale)of at least degree VII near the LSB landslide during *** timing of a second reactivation phase coincides with palaeo-seismic episode IV,which occurred at 2100-2200 a *** study could provide reference for studying the regional palaeoseismic activities and palaeo landslide evolution near the Litang area.

关键词： prehistoric landslide Active fault zone Palaeo-seismic episode Dating

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