Holocene activity evidence on the southeast boundary fault of Heqing basin, middle segment of Heqing-Eryuan fault zone, West Yunnan Province, China  

作　　者：SUN Chang-bin LI De-wen SHEN Xiao-ming KANG Yan-rui LIU Rui ZHANG Ya-jiao 

机构地区：[1]Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration [2]School of Earth Sciences and Resources, China University of Geosciences

出　　处：《Journal of Mountain Science》2017年第7期1445-1453,共9页山地科学学报（英文）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 41171001, 41471002, 41402184);the 1:50000 Active Fault Mapping of HeqingEryuan fault (Grant No. 201108001-20);a research grant from the Institute of Crustal Dynamics, China Earthquake Administration (Grant No. ZDJ2013-17)

摘　　要：The Heqing-Eryuan fault is an important part of the active fault system in the Northwestern Yunnan Province, China. Thus, the study on the nature, characteristics and activity history of this fault can provide not only the basis for seismic safety and engineering evaluation, but also the important information for the characteristics, history and patterns of the structural deformation of the southeastern margin of the Tibetan Plateau. Trench and faulted landforms investigations could provide effective paleoseismic methods to obtain the recent parameters of active faults. Using these methods, this study makes some breakthroughs on the recent activity of southeast boundary fault of the Heqing basin, middle segment of Heqing-Eryuan fault zone. Results indicate that the average vertical slip rate and left-lateral slip rate of the segment are about 0.28 mm/a and 1.8o mm/a respectively since the Late Pleistocene. The trench near the Beixi Village at the .outhea.t houndnrv fault of the lqaaing basinreveals that there have been at least three paleoearthquake events during the Holocene （8 ka BP）. The vertical displacement and sinistral strike-slip distance of a single paleoearthquake are ~20 cm and -1.2 m, respectively. The estimated paleoearthquake magnitudes with Ms7.o, and the recurrence interval at 2-5 ka, as well as the latest activity time during 800- 290 ca1 yr BP, are of great significance for preventing and mitigating regional earthquake disasters.

关 键 词：Heqing-Eryuan fault zone PALEOEARTHQUAKE Holocene activity Sinistral strike-slip Heqing basin 

分 类 号：P542[天文地球—构造地质学]