Fault-Growth Pattern of the South Margin Normal Fault of the Yuguang Basin in Northwest Beijing and its Influencing Factors

查看全文 作　　者：WANG [1,2]Lin;TIAN [3]Qinjian;LI [4]Dewen;ZHANG [2]Xiaoliang

机构地区：[1]Institute of Geology, China Earthquake Administration;[2]China Earthquake Disaster Prevention Center;[3]Institute of Earthquake Science, China Earthquake Administration;[4]Institute of Crustal Dynamics, China Earthquake Administration

出　　处：《Acta Geologica Sinica(English Edition)》索引2013年第87卷第3期,共13页

基　　金：financially supported by the Yuguang Basin 1:50000 Geological Mapping Project (no. 201210916),a subsubject of Active Fault Seismic Hazard Assessment Project of China's Key Area for Surveillance and Protection 摘　　要：Based on high-resolution remote sensing image interpretation, digital elevation model 3-D analysis, field geologic field investigation, trenching engineering, and ground-penetrating radar, synthetic research on the evolution of the Yuguang Basin South Margin Fault (YBSMF) in northwest Beijing was carried out. We found that the propagation and growth of faults most often occurred often at two locations: the fault overlapping zone and the uneven or rough fault segment. Through detailed observation and analysis of all cropouts of faults along the YBSMF from zone a to zone i, we identified three major factors that dominate or affect fault propagation and growth. First, the irregularity of fault geometry determine the propagation and growth of the fault, and therefore, the faults always propagate and grow at such irregular fault segments. The fault finally cuts off and eliminates its irregularity, making the fault geometry and fault plane smoother than before, which contributes to the slipping movement of the half-graben block in the basin. Second, the scale of the irregularity of the fault geometry affects the result of fault propagation and growth, that is, the degree of the cutting off of fault irregularity. The degree of cutting off decreases as irregularity scale increases. Third, the maximum possible slip displacement of the fault segment influences the duration of fault propagation and growth. The duration at the central segments with a large slip displacement is longer than that at the end segments with a smaller slippage value. 关键词：故障故障西北部影响因素南缘盆地北京遥感影像解译数字高程模型

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Fault-Growth Pattern of the South Margin Normal Fault of the Yuguang Basin in Northwest Beijing and its Influencing Factors

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