supported by the National Technology R&D Program in the 11th Five year Plan of China(No.2007BAQ00168-1-1);the National Natural Science Foundation of China(No. 41103052/D0309);the Shanxi Province Excellent Graduate Innovation Program(No. 20113038)
During transient electromagnetic method (TEM) exploration of a copper mine, we detected the late-channel TEM signal reversal phenomenon (a voltage change from positive to negative) caused by the influence of the i...