复杂地形条件下高频大地电磁法响应特性初探

摘要

基于电磁场正演理论编制高频大地电磁法正演程序,采用自适应有限元方法模拟起伏地形对高频大地电磁数据的影响,在10～105 Hz频率范围内,通过地堑、地垒、任意起伏地形3种模型,分析总结起伏地形对高频大地电磁法TM和TE两种极化模式的视电阻率和阻抗相位曲线的影响规律,所揭示的规律可为山区高频大地电磁勘探外业布置与数据分析解释提供参考.%According to the forward theory of electromagnetic method,this paper has compiled the forward program of high frequency magnetotelluric method (HMT).In the frequency range of 10 to 105 Hz,we use the adaptive finite element method to simulate the effect of HMT data with undulating terrain.We make three models including peaks,valleys and undulating terrain to simulate the response curves of HMT.The influence of apparent resistivity and impedance phase curves of two polarization modes of TE and TM are analyzed and summarized.The conclusion can provide reference for the interpretation of HMT data under complex terrain conditions.