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冰川冻土  1981 

北美多年冻土调查中使用的几种电磁方法

, PP. 88-98

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Abstract:

从六十年代以来,电磁方法(又称交流电法)的地球物理勘探已普遍应用。这种方法具有无接触的特点,即没有电极与地的接触及其固有的接触电阻,且具有一定的勘探深度。可利用传播的无线电能量的全部频谱,从由雷电产生的超低频信号到由放射性衰变产生的γ射线的辐射。这种方法既可以是被动式的,如测量大地电流、自然电位、磁场、光辐射和核辐射;也可以是主动式的,如发射和接收雷达信号或无线电回波,感应和测量磁场或电场的感应极化强度。

References

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