| 从地震信息看新生代郯庐断裂带的展布与活动 |
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| 引用本文： | 杨克绳,胡平,党晓春.从地震信息看新生代郯庐断裂带的展布与活动[J].地学前缘,2009,16(4):240-251. |
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| 作者姓名： | 杨克绳 胡平 党晓春 |
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| 作者单位： | 1东方地球物理公司研究院, 河北 涿州 072751
2北京市地震局, 北京 100083 |
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| 摘 要： | 郯庐前新近纪断裂带为中国东部滨太平洋地区一条巨型张扭走滑构造带。利用地震信息分析地质结构,可将其分为南、中、北三大段和七亚段。按其影响范围的规模可划分为广义和狭义两类:广义郯庐前新近纪断裂带地质结构是“两凹夹一隆”,狭义郯庐前新近纪断裂带则指高垒带与两侧(邻)的断层组合。断裂带内外都发育有反转、花状构造。狭义郯庐前新近纪断裂带走向为NNE,仅在嘉山以南为NE向,其两侧的前新近纪断层大体上都为EW、NE和NEE走向,与狭义郯庐断裂呈锐角相切。古近纪构造层中,由南到北郯庐断层两侧箕状断陷边界都由生长断层所组成,说明郯庐断裂两侧的古近纪断陷应属拉张盆地,并非拉分盆地,郯庐古近纪断裂动力学是拉张而非拉分构造应力场。古近纪构造层在拉张翘倾运动中叠加了右旋走滑地质应力,这种右旋走滑应力是太平洋板块向西俯冲至欧亚板块之下的结果。中生代郯庐断裂的动力学表现为库拉板块向北俯冲至欧亚板块之下形成的左旋平移现象。郯庐断裂NE向平移走滑与北西向隐蔽断裂的相交处是发生破坏性地震的构造部位,因此,应特别重视对高丽营北东向生长断层与渤中-孙河-南口北西向隐蔽断层相交处地震动向的监控。
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| 关 键 词： | 关键词：广义郯庐断裂 狭义郯庐断裂 拉张应力 拉分应力 监视天然地震 |
Distribution and activity of Tanlu fault belt in Cenozoic shown by seismic data. |
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| YANG Ke-Min HU Beng DANG Xiao-Chun.Distribution and activity of Tanlu fault belt in Cenozoic shown by seismic data.[J].Earth Science Frontiers,2009,16(4):240-251. |
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| Authors: | YANG Ke-Min HU Beng DANG Xiao-Chun |
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| Institution: | 1Geophysical Research Institute, Bureau of Geophysical Prospecting, China National Petroleum Corporation, Zhuozhou 072751, China;
2Beijing Seismological Bureau, Beijing 100083, China |
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| Abstract: | The Tanlu fault belt, being a pre Neogene giant fault belt located in the marginal Pacific area of East China, can be divided into southern, central and northern segments, and seven sub segments based on the geologic contexture shown in seismic data. In petroleum industry, there are two different views on the belt in terms of effective extension of the belt, i.e. the broad sense of Tanlu fault belt and the narrow sense of Tanlu fault belt. The geological contexture of the broad sense of pre Neogene Tanlu fault belt includes two basins separated by the central uplift, and the geological contexture of the narrow sense of Tanlu fault belt consists of a central horst belt and the faults on its both sides. The broad sense of Tanlu fault belt is unacceptable because of its broadening the limitation of Tanlu fault belt and the existence of inversion and flower structures developed both inside and outside of the belt. The general extension of the narrow sense of Tanlu fault belt is NNE, and changes to NE on the south of Jiashan. The pre Neogene faults (extending EW, NE and NEE) on both sides of the belt intersect the belt with acute angles. The boundary faults of all Paleogene half grabens developed on both sides of the belt from north to south are growth faults. It indicates that the Paleogene basins are extension basins rather than the pull apart basin. The dextral strike slip stress superimposed on the paleogene structural layer was caused by the under thrusting of Pacific plate beneath the Eurasian plate. The left translational movement of the belt resulted from the north under thrusting of Kula plate beneath the Eurasian plate during the Mesozoic. The intersection position of Tanlu NE translational strike slipping fault and the subtle faults extending NW is the structural position for earthquake generation. So, we should pay more attention to supervise the earthquake activity in the intersection position of Gaoliying growth fault (extending NE) and the subtle fault of Bozhong Sunhe Nankou which extending NW. |
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| Keywords: | Key words: broad sense Tanlu fault belt narrow sense Tanlu fault belt extensional stress dextral strike slip stress supervise natural earthquake |
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