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均匀大地表面上大回线源在地下形成的瞬变电磁场解析计算式很复杂，无法用常规方法定义其视电阻率，而场值曲线本身分辨率低，进行分层解释困难。对大回线源在地下形成的瞬变电磁场场值，用由第一层介质充满半无限大地时的场值进行归一化的方法进行解释，经理论计算表明，与地面装置条件下的电阻率曲线进行解释有异曲同工之妙
The analytical formula of the transient electromagnetic field formed by the large-scale return source on the uniform earth surface in the ground is very complicated. The apparent resistivity can not be defined by the conventional method, but the field curve itself has low resolution and difficult to be interpreted hierarchically. The transient electromagnetic field values formed in the ground by the large loop source are explained by normalizing the field values when the first layer is filled with semi-infinite land. Theoretical calculations show that the resistance Rate curve to explain the same purpose