利用小波变换分离俯冲带重力异常

综合应用小波多重分解法和小波多尺度边缘重构方法研究了重力异常的分离,发现该方法可以同时进行纵向和横向影响的有效分离,为复杂地区重力异常的合理分离提供了参考。在模拟实验的基础上,应用该分离方法对琉球俯冲带地区的重力异常进行了分离。在纵向分离中,提出根据重力异常和海底地形的相关性确定合适的分离尺度。在小波多尺度边缘分析中,通过选择合适的尺度范围同样可以达到分离横向重力异常的效果,而且比多尺度边缘重构方法简单。

Gravity Anomaly Separation of the Subduction Zone Based on Wavelet Transform

The separation of the gravity anomaly using wavelet multiple decomposition and wavelet multiscale edges reconstruction are studied.The vertical and horizontal influence can be separated simultaneously by this method,which provides a reasonable reference for the separation of complex regional gravity anomaly.The gravity anomalies of the Ryukyu subduction zone are separated base on simulation experiment.In the vertical gravity anomalies separation,the separation scales can be determined,based on the correlation between gravity anomaly and topography.Wavelet multiscale edge analysis by selecting appropriate scales range can achieve the effect of gravity horizontal separation,which is simpler than multiscale edges reconstruction.The data used to inverse structure of the subduction zone can be got through the separation.