营口-潍坊断裂带新构造和新构造活动的再认识

发布时间：2018-08-10 07:11

【摘要】：营潍断裂带是郯庐断裂带通过渤海的部分,亦为渤海湾盆地东部构造的重要组成部分,近年来一些研究者从不同角度对断裂带的新构造和新构造活动等进行了不同程度的研究。文中基于以往的工作并结合其他研究者的成果,对该断裂带的新构造和新构造活动及有关问题再次作了分析。渤海地区新构造运动开始于中新世晚期(12~10MaBP),它源自区域地壳水平运动,新构造应力场以NEE-SWW至近EW向水平挤压为特征。营潍断裂带的新构造,主要表现为先存古近纪断裂复活和新构造应力场初始应力作用在其上覆新近系--第四系中形成的构造变形,它以断裂极其发育为特征。NE向斜切营潍断裂带中段的庙西北-黄河口新生断裂带的产生,不仅使营潍断裂带的新构造和新构造活动具分段性,而且使该断裂带的新构造活动显著减弱。渤海东部地震基本沿庙西北-黄河口断裂带分布,营潍断裂带辽东湾段和莱州湾段地震较少且震级小。为究其原因,最后还作了初步的力学分析。
[Abstract]:Yingwei fault zone is the part of the Tan-Lu fault zone passing through the Bohai Sea, and it is also an important part of the eastern structure of the Bohai Bay basin. In recent years, some researchers have studied the neotectonics and neotectonic activities of the fault zone in different degrees from different angles. Based on the previous work and the results of other researchers, the new structure, neotectonic activity and related problems of the fault zone are analyzed again. The neotectonic movement in the Bohai Sea region began in the late Miocene (12~10MaBP) and originated from the horizontal movement of the regional crust. The new tectonic stress field is characterized by horizontal compression in the direction of NEE-SWW to near EW. The neotectonics of Yingwei fault zone mainly show the tectonic deformation formed in the upper Neogene-Quaternary system by the revival of Paleogene faults and the initial stress of neotectonic stress field. The occurrence of the new fault zone of Miao Northwest to the Yellow River estuary in the middle segment of the central section of the inclined tangential Yingwei fault zone, characterized by the development of the fault, not only makes the neotectonic and neotectonic activities of the Yingwei fault zone segmented. Moreover, the neotectonic activity of the fault zone is significantly weakened. The earthquakes in the eastern Bohai Sea are mainly distributed along the Miao Northwest-Huanghe Estuary fault zone, and the earthquakes in the Liaodong Bay and Laizhou Bay sections of the Weiying fault zone are less and the magnitude is small. In order to investigate its cause, a preliminary mechanical analysis is made at last.
【作者单位】：中国地震灾害防御中心;中国地震局地质研究所;中国地质调查局青岛海洋地质研究所;中国地质科学院地质研究所;
【基金】：中国地震活断层探查华北构造区项目(200908001) 中国地质调查局子项目(12120115070101)共同资助
【分类号】：P315.2

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