【摘要】 根据烟圈理论 ,将发射源在地球中感应的电流线看成是随时间向下扩散的烟圈 ,称之为发射源象 .将源象在地表的磁场和源附近测得的响应磁场相对比 ,确定源象深度 ,由此用三次样条插值法求出源象扩散速度 ,并与均匀半空间中烟圈向下扩散的速度进行对比 ,从而近似估算出随深度变化的电阻率 .本文主要讨论圆形回线发射源情形 ,编制出相应的近似反演程序 ,并对一维层状理论模型和实测资料进行反演试验 .更多还原

【Abstract】 WT5BZ]In this paper, based on the theories of smoke ring, current lines in the Earth, induced by transmitting source on the Earth′s surface, are regarded of as downward moving and outward expanding current filaments which are called as images of transmitting source. By comparing the magnetic field of the current filaments with that measured near the source, we can determine the image depth which can be used for estimating the downward vertical velocity of the image by using a cubic spline interpolation method. Then the resistivities varying with depth can be approximately estimated through a comparison between the estimated velocity of the image and the downward diffusing velocity in a homogeneous half space. We discussed the case of a circular transmitting loop, and developed a corresponding approximate inversion program which has been tested for 1 D layered Earth models and real data.更多还原