黄海及邻区莫霍面起伏特征

针对地壳构造形成的动力学机制，在广泛收集区域地质、地质构造和地球物理等资料的基础上，着重对重力数据进行了数字化、坐标、重力公式、投影方式和比例尺的统一化处理，进而进行了网格化处理.为将区域异常和局部异常分离开来，以便以对深部构造的系统研究，笔者选取趋势分析法分别对研究区内预处理后的布格重力异常数据(Δg)进行了三维多项式迭代拟合计算,得到了区域布格重力异常二阶、五阶、十阶趋势分析结果.继而，利用二级近似公式迭代法对布格重力异常五阶趋势分析区域异常数据进行了三维运算处理，得到了黄海及周边地区的莫霍面埋深值.分析了黄海及邻区莫霍面起伏特征，并进行了深部构造区划，探讨了深部断裂构造与莫霍面起伏间的成因联系，为深部构造和活动断裂演化的地球动力学研究提供了依据.

The Study on the fluctuation of Moho in Yellow Sea and its adjacent area

With a view to the dynamic mechanism about the formation of earth crust, the authors collect the data of regional geology, geological structure and geophysics. Based on the digitalization, unifying transformation and processing of coordinate, gravity formula, projection and scale of gravity data, the girding is further processed. To separate the regional anomaly from local anomaly for the study of infrastructure, the Trend Analysis Method is used to carry out the calculation of Three\|Dimension Multinomial Iteration Matching to the Bouguer gravity anomaly data (Δg) after the preprocessing. The analysis results about the regional Bouguer gravity anomaly such as the second, five and ten trend analyses is obtained. Afterwards using Secondary Grade Proximate Formula Iteration, the three\|dimension calculation processing to the five trend analysis results of Bouguer gravity anomaly is carried on. The isoline map of Moho in Yellow Sea and its adjacent area is gotten. The fluctuation feature of Moho is analyzed in the paper. Based on the analysis to the bathymetric map of Moho, the four first grade mantle upheaval\|depression units as well as twelve secondary mantle upheaval\|depression (salient, sag, slope, convex flat, convex saddle, concave flat) are defined in the paper. The fluctuation of Moho has a better mirror appearance alike corresponding relationship with the nowaday geomorphic shape. The relationship between the deep fractures and fluctuation of Moho is probed into. This provides the evidence for the study on the geodynamics of evolution of infrastructure and active fractures.