一种三维重、磁异常的向上延拓的近似计算

本文利用立体角求和的方法对向上延拓进行近似计算。方法假设边界平面上第一小元域内的场值对延拓值的贡献与小元域对延拓点所张的立体角有关。求出立体角就能够求出延拓系数。实例计算表明减少了边缘的损失,其结果可与原有的积分延拓方法相比拟。

A KINO OF APPROXIMATE CALCULATION FOR THE UPWARD CONTINUATION OF THREE-DIMENSIONAL GRAVITY AND MAGNETIC AMOMALIES

This paper makes an approxinate calculation of the upward continuation with the method of summation by solid angles. It is assumed that the effect on the continuation vaiue brought abont from the potential field value within each small element on the boundary elements is conneted with the solid angles spreud from the continuatiou pointo of the small elements. The continuation coefficent can be calculated so long as solid angles can be cai- culated. Calculating results of samples showthat some dorder losses reduce. The calculating resulte are comparable to those obtained by conventional integration continuation.