南黄海布格重力异常的小波多尺度分析

Wavelet transform and multi-scale decomposition of Bouguer gravity data of the South Yellow Sea

采用二维小波变换与多尺度分解技术,对南黄海布格重力异常进行了分解,得到了自地表至莫霍面深度范围的不同尺度的密度体所产生的重力异常,从而获取不同切割深度的断裂构造、沉积基底及莫霍面所产生的重力异常。结果表明:该区断裂相互交错、切割深度不一,有明显的多期活动的迹象;小波变换的四阶异常细节主要由沉积基底面起伏所引起的,而小波变换四阶异常逼近主要反映了该区莫霍面起伏特征。

Bouguer gravity anomaly in the South Yellow Sea is decomposed with two dimensional wavelet decomposition technique. In order to obtain the gravity anomalies correlated with fractures, sedimentary and Moho basements, gravity anomalies produced by anomalous density bodies varying from surface to Moho are obtained. The results show that the faults of different tendencies intermesh and cross mutually, which indicates that multiple-period tectonic reformation occurs and the forth order detail of the Bouguer gravity anomaly mainly reflects the sedimentary basement, while the fourth order approximation of the Bouguer gravity anomaly reflects the Moho.