南海北部新构造活动特征及地震区带划分参数分析

发布时间：2018-07-30 07:26

【摘要】：南海北部分布有赋存石油、天然气资源的沉积盆地。南海北部的地震活动会对资源聚集的沉积盆地的稳定性有重要且直接的影响。着重对南海北部的主要断裂带分布及其活动特征进行详细分析。在对南海北部已有地震数据研究基础上,形成了南海北部断裂带分布图、南海北部的地震震中分布图。依照地震区、带小区划确定的原则,在南海北部地震活动性区划图基础上,形成了3个地震小区划,分别是广东沿海小区、福建沿海小区、珠江口盆地和台湾浅滩小区。最后对比研究了3个地震小区划的地震参数b值范围及地震动加速度,其中广东沿海小区的b值为0.949 8,福建沿海小区为0.645 2,珠江口盆地和台湾浅滩小区为0.486 5,该区的地震动加速度值介于0.115~0.379g之间。该项研究工作可以为南海北部沉积盆地稳定性分析评价提供依据。
[Abstract]:There are sedimentary basins with oil and natural gas resources in the northern part of the South China Sea. Seismic activity in the northern part of the South China Sea has an important and direct effect on the stability of sedimentary basins where resources are concentrated. The distribution and active characteristics of the main fault zones in the northern part of the South China Sea are analyzed in detail. Based on the existing seismic data in the northern part of the South China Sea, the distribution map of the fault zone in the northern part of the South China Sea and the epicenter map of the earthquake in the northern part of the South China Sea are formed. On the basis of the seismicity zoning in the northern part of the South China Sea, three seismic microzonations have been formed according to the principle of determining the seismic zone and belt microzonation. They are Guangdong coastal area, Fujian coastal area, Pearl River mouth basin and Taiwan shoal area. Finally, the range of seismic parameters b and ground motion acceleration of three seismic microzonations are compared and studied. The b value of Guangdong coastal area is 0.949 8, that of Fujian coastal area is 0.645 2, and that of Pearl River mouth basin and Taiwan shoal area is 0.486 5. The acceleration of ground motion in this area is between 0.115 and 0.379g. This work can provide a basis for the stability analysis and evaluation of sedimentary basins in the northern South China Sea.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;天津大学岩土工程研究所;华北理工大学矿业工程学院;
【分类号】：P618.13;P736.1

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