The transient response of the 1d earth model excited by a circle loop is obtained by integrating the response of vertical magnetic dipole over the circle loop.

采取先求解垂直磁偶极子响应，再沿大回线源积分的方式求解大回线源的一维瞬变响应。

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.

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。