中文摘要：

重力异常是由地下各种密度不均匀体所产生的叠加效果。采用二维小波多尺度方法对南海北部缘重力异常进行分析,解译了重力异常所反映的地下源体,对南海北部缘盆地构造进行认识。通过对南海北部缘重力异常进行分解,结合研究区域地形地貌,对盆地构造和地下岩体分布等地质特征进行分析。结果显示,四阶变换逼近主要由莫霍面起伏引起,小波变换细节主要由沉积基底面的起伏引起。利用小波多尺度对重力异常进行分析具有较好的效果,值得进一步推广研究。

英文摘要：

The gravity field contains the superimposition effect of heterogeneous bodies with different densities.In order to better analysis the information of the underground source reflected by gravity abnormity and the structure of the north marginal basins in South China Sea,this paper adopted the method of the two-dimensional wavelet decomposition technique.Through resolving the gravity abnormity in the north marginal basins in South China Sea,and combining the topography and geomorphology of the study area,this paper discussed the basin structure and the geological characteristics of rock mass distribution.The results show that the fourth order transform approximation is mainly composed of the information of Moho undulations,and the wavelet transform details is mainly composed of the information of sedimentary-base undulations.It is a better way to use wavelet multi-scale method to analysis the gravity anomaly.