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[1]CHANG Yuqiao,LI Xi,ZHOU Qingyun,et al.The Holocene Activity Evidence of Paleo-earthquakes in the Northwestern Segment of the Deqin-Zhongdian Fault[J].Journal of Seismological Research,2023,46(02):261-270.[doi:10.20015/j.cnki.ISSN1000-0666.2023.0023]

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The Holocene Activity Evidence of Paleo-earthquakes in the Northwestern Segment of the Deqin-Zhongdian Fault

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 46 Number of periods: 2023 02 Page number: 261-270 Column: Public date: 2023-06-01

Title:: The Holocene Activity Evidence of Paleo-earthquakes in the Northwestern Segment of the Deqin-Zhongdian Fault

Author(s):: CHANG Yuqiao¹; LI Xi²; ZHOU Qingyun¹; BAI Xianfu¹; RAN Hua¹; LUO Weidong¹; (1.Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)(2.School of Earth Science,Yunnan University,Kunming 650500,Yunnan,China)

Keywords:: the Deqin-Zhongdian Fault; the Gongka Lake trench; paleo-earthquake; Holocene activity; the Yunnan-Tibet Railway Project

CLC:: P315.2

DOI:: 10.20015/j.cnki.ISSN1000-0666.2023.0023

Abstract:: Based on the high-resolution remote sensing interpretation and a detailed field geological and geomorphological survey,we excavate a trench in the linear fault trough beside the Gongka Lake to reveal the direct evidence of the Holocene activity and paleo-earthquake.The trench,which is perpendicular to the fault trace,obviously manifests positive dip-slip faults and shows that the Deqin-Zhongdian Fault has dislocated the Holocene stratum.Through paleoseismic analysis of the relationship between the fault and stratigraphic ages,cracks and colluvial,and the age of sedimentation determined by means of AMS-¹⁴C dating,two palaeo-seismic events are identified.They are respectively between(1 140±30)-( 1 010±30)a BP and(570±30)-(410±30)a BP.The segment in the northwest of the Deqin-Zhongdian Fault was an active fault in Holocene and was characterized as positive dip-slip.

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Last Update: 2023-03-10