Characteristics of Active Faults Relatedto Deep Faultsinthe Northwestern Part ofthe South Yellow Sea
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摘要:
南黄海海域位于欧亚板块与太平洋板块两大板块相互作用的关键区域，新生代构造活动活跃，研究其活动断裂特征进而分析新构造运动规律对防震减灾具有重大意义。针对深大断层控制活动断层的特点，通过多道地震成像处理剖面，结合最新的钻探成果，准确标定了第四系底界地震反射层位，在此基础上解释获得了南黄海盆地西北部与深大断层相关的第四纪活动断层的分布特征。对活动断层的动力学机制分析认为，更新世以来，南黄海区域上受控于菲律宾海板块、印度洋板块与欧亚板块在该区域所营造的近EW向的挤压应力场，活动断层的属性与展布特征与该动力学机制具有较好的一致性。这些大地构造运动力的综合作用，对南黄海地区活动断层发育和地震活动起重要作用。
Abstract:The southern Yellow Sea is located in the area where the Eurasian and Pacific plates interact. Cenozoic tectonic activities are quite active there. It is of great significance to study the characteristics of active faults so as to understand the neotectonic movement of the region for earthquake prevention and disaster mitigation.It is believed that active faults are controlled by deep faults. In order to understand the features of the active faults, this paper accurately calibrated the bottom boundary of the Quaternary with multi-channel seismic imaging processing in addition to new drilling holes. The distribution pattern of the deep faults related active faults in the northwestern Yellow Sea Basin is described and explained. Results show that the distribution of Quaternary active faults are obviously associated with deep faults. According to the analysis of the dynamic mechanism of the active faults, the South Yellow Sea has been affected by a near EW compressive stress field since the Pleistocene, caused by the joint interaction of the Philippine Sea plate, the Indian Ocean plate and the Eurasian plate in the south. The development of active faults and related earthquakes play important roles in the Yellow Sea region.
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Key words:
- active structure /
- neotectonic movement /
- multi-channel earthquake /
- South Yellow Sea
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