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  刘华国,吴小江,李峰,贾启超,王志成,林镇,贾伟,徐锡伟,章龙胜,胡金桥.马袅-铺前断裂中段全新世活动特征研究[J].震灾防御技术,2018,(3):588-599, DOI:10.11899/zzfy20180310.

马袅-铺前断裂中段全新世活动特征研究
摘要:    本文采用地球物理勘探和钻孔联合剖面探测相结合的方法,分别在林海三路和桃兰村展开探测,通过分析断层上断点埋深、断错地层序列和地层年龄,获得了马袅-铺前断裂的全新世活动特征。2排联合钻孔剖面均揭露出断面,断裂上断点埋深9.2—10.5m,从而准确厘定了马袅-铺前断裂中段的空间位置。钻探结果显示,马袅-铺前断裂分为近东西向平行分布的南、北2支,呈阶梯状发育,具正倾滑性质,倾向北,倾角约70°。其中,北支为第四纪早期次级断裂,南支为全新世活动性较强的主断裂。同时,钻孔揭示深度内该断裂段第四纪以来的垂直位移量约为4—6m,7965—7408a BP以来断裂有过活动,垂直位移量约1—2m,垂直位移速率约为0.26±0.1mm/a。
作者单位
刘华国 中国地震灾害防御中心, 北京 100029 
吴小江 海南省地震局, 海口 570203 
李峰 中国地震灾害防御中心, 北京 100029 
贾启超 中国地震灾害防御中心, 北京 100029 
王志成 海南省地震局, 海口 570203 
林镇 海南省地震局, 海口 570203 
贾伟 海南省地震局, 海口 570203 
徐锡伟 中国地震局地壳应力研究所, 北京 100085 
章龙胜 海南省地震局, 海口 570203 
胡金桥 海南省地震局, 海口 570203 
关  键  词:钻孔联合剖面  马袅-铺前断裂  全新世活动
DOI:10.11899/zzfy20180310
基金项目:中国地震局城市活断层探测与地震危险性评价项目(15406033402)和地震行业专项(20140823)共同资助
收稿日期:2018-03-29
作者简介:刘华国,男,生于1982年。助理研究员。主要从事活动构造、遥感地质与工程地震方面研究。E-mail:cedpclhg@163.com
通讯作者:李峰,男,生于1972年。副研究员。主要从事活动构造、工程地震与空间数据库应用方面研究。E-mail:13810098099@163.com
Active Characteristics of the Middle Segment of Maniao-Puqian Fault in the Holocene
Abstract:      In this paper, geophysical exploration is combined with composite drilling section exploration, respectively in the Linhaisanlu and Taolan village, in order to study the Holocene activities of the Maniao-Puqian fault through the analysis of the depth of upper breaking point, faulted strata sequence and stratigraphic age. All the two composite drilling sections reveal the fracture of the fault, and the depth of upper breaking point is about 9.2m to 10.5m, which allow us to determine the space position of the middle fracture of the fault. The results of the drilling show that the fault is divided into two branches in north-south with stepped distribution characteristics, and both of them, nearly parallel, are normal slide faulting with about 70° dip. The northern branch is a fault that is active in the early Quaternary, and the southern branch is a main Holocene active fault. Meanwhile, drilling also reveals that the cumulative displacement in borehole depth is 4m to 6m before Quaternary, and the vertical displacement of the fault is about 1—2m since 7965—7408a BP. Based on the results of the stratigraphic age, we estimate that the vertical displacement rate of the section is about 0.26±0.1mm/a.
Keywords:  Composite drilling section  Maniao-Puqian fault  Holocene active characteristics
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