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在给定密度界面初始模型之后,可以计算出地下某一起伏界面引起的重力异常。将此异常向上延拓到地面,并与实测异常对比,求出模型的修正量。用此修正量修改初始模型,如此反复选代,直至满意为止。由于上延计算可利用傅里叶变换转换到频率域进行,因而使计算大为简便、快速。文中还介绍了对初值平均深度进行修正的方法。理论模型试算表明,在界面两侧密度差较为稳定的情况下,反演效果是良好的。
Given the initial model of the density interface, we can calculate the gravity anomalies caused by a fluctuating interface in the underground. This anomaly up to the ground extension, and compared with the measured anomalies, find the model of the correction. Use this correction to modify the initial model, so repeatedly selected until satisfied. Since the up-delay calculation can be performed using the Fourier transform into the frequency domain, the calculation is easy and fast. The article also introduced the method of correcting the average initial depth. The theoretical model trial shows that the inversion effect is good under the condition of relatively stable density difference on both sides of the interface.