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本文以理论公式证明地磁测深的电磁阻抗不可能在某一“穿透频率”附近发生不连续的突变。利用“穿透频率”的概念定出的佘山地区地幔电导率是不妥的。
This paper proves that the electromagnetic impedance of geomagnetic sounding can not discontinuously change near a “penetration frequency”. It is inappropriate to use the concept of “penetration frequency” to determine the conductivity of the mantle in the Sheshan area.