SHI Zhigang
1 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2 Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou, Gansu 730000, China;3 Jinchuan Group Co. Ltd., Jinchang, Gansu 737100, ChinaYUAN Daoyang
2 Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou, Gansu 730000, ChinaHE Wengui
2 Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou, Gansu 730000, ChinaLIU Xingwang
2 Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou, Gansu 730000, ChinaWANG Jun
1 Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, ChinaThis study is supported by the Chinese Geological Survey (CGS) (Grant No. 1212011120181 & Grant No. 1212011120115), and a key project of the Natural Science Foundation of China (Grant No. 41030317). We give thanks to the anonymous reviewers for their constructive criticism and suggestions.
This study’s objective was to investigate the Guguan-Xiangong Fault, which lies in the southern Liupanshan area, through satellite image interpretation and field observations. Guguan-Xiangong Fault is divided into five subsegments; among these, the Badu-Longwei segment has been the most recently active. The geomorphic features of the Badu-Longwei segment are clearly displayed, including multiple high fault scarps with fresh bedrock free faces. There is significant evidence for Holocene activity of the three fault sections, located in Renhuashu, Tianjiagou, and Xinjiecun respectively. The three sections feature distinct episodic deposition and fault scratches. Based on 14C-dating and field observations on the three fault sections, two or more paleoearthquakes across the Badu-Longwei fault segment are ascertained, between 5874±116 and 5430±140 a BP, and after 2037±83 a BP respectively. The Badu-Longwei segment of the Guguan-Xiangong Fault is preliminarily extrapolated as the seismogenic structure of the 600 A.D. Qin-Long earthquake.
SHI Zhigang, YUAN Daoyang, HE Wengui, LIU Xingwang, WANG Jun.2015. Recent Activity of the Badu-Longwei Segment, Guguan-Xiangong Fault in Southern Liupanshan, Constrained by Rhythmic Sediment Lithology and Geomorphic Characteristics[J]. Acta Geologica Sinica(),89(4):1165-1175
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