Geological and Geomorphological Features of Late Quaternary Activity in the Northern Segment of Weixi-Qiaohou Fault
The Weixi-Qiaohou fault located at the borders zone of the Tibetan and Yunnan-Guizhou plateaus is a large-scale active fault on the southeast margin of the Tibetan Plateau.Studying its neotectonic activity has considerable scientific importance for understanding the tectonic framework and movement of the Chuan-Dian block.In this study,the movement and sliding rate of the northern segment of the fault are described mainly based on the results of detailed field geological and geomorphic investigations.The research results have provided geological evidence of Late Pleistocene activity at Baijixun,Weixi County,and Zhaniluo,which is highly indicative of Late Quaternary activity.This segment movement is mainly dominated by dextral slip,with a horizontal slip rate of 1.0-1.2 mm/a and a vertical slip rate of 0.3-0.4 mm/a according to the terrace distortion and scarps.
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