首页|Quaternary Activity Characteristics and Regional Tectonic Significance of the Jiulong Fault in Jiujiang,Jiangxi Province,China
Quaternary Activity Characteristics and Regional Tectonic Significance of the Jiulong Fault in Jiujiang,Jiangxi Province,China
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Obtaining geological and landform dislocation features,as well as the measured strati-graphic activity age,provides direct evidence to evaluate fault activity,which is more difficult to do in areas with low tectonic activity,such as eastern and central China.A detailed investigation of the fault activity,trenching,drilling joint geological profile,geological survey,and chronological analysis were used to obtain the spatial geometry,fault kinematics,and activity chronology of the Jiulong fault.The conclusions are as follows:(1)The Jiulong fault was a fracture zone composed of four branch faults,with a width of around 30-40 m and good extendibility,while the maximum surface rupture length was 373 m.(2)The Jiulong fault has many strata dislocations,and the dislocation distance decreased from bottom to top,demonstrating synsedimentary structure characteristics,with a maximum stratigraphic dislocation distance of 18.2 m.(3)Preliminary analysis suggested the Jiulong fault as a secondary frac-ture of the Xiangfan-Guangji fault zone and provided evidence of the southeastward extension of the Xiangfan-Guangji fault.A preliminary hypothesis purported the Xiangfan-Guangji fault as the seismo-genic fault of the Ms 5.0 magnitude earthquake in 1911.(4)According to OSL and ESR dating analy-ses,the upper breakpoint of the Jiulong fault cuts into the Late Pleistocene Xingang Formation(Qp3x)strata,and the latest active age of the Jiulong fault was 57.6 ka.The chronology analysis confirmed an active fault from the Late Pleistocene and identified a weak tectonic in Jiujiang Province,which repre-sents the largest active fault outcrop uncovered in the area so far.This study provides evidence and re-search materials for the evaluation of fault activity and seismic stability in this region.
active faultregional tectonicearthquakesseismic intensitytectonics
Xin Qi、Yuyong Jiao、Qinghua Li、Bin Li
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Faculty of Engineering,China University of Geosciences,Wuhan 430074,China
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