关于音频大地电磁测深在冻土区“跳点”现象研究

在中低纬度多年冻土区多次实验分析如何改善音频大地电磁测深（AMT）高频段出现的＂跳点＂现象。根据测量结果认为天然电磁场信号、季节气候、采集时间、极距长短对高频段视电阻率数据下跳影响明显。提高野外测量数据质量,AMT高频段视电阻率测点具有真实圆滑连续性,对研究青藏高原冻土分布有重要指导意义。

Research on the ‘Jump Point＇ Phenomenon of Audio-Frequency Magnetotelluric Sounding in the Permafrost Zone

In the permafrost zone of low latitude, several experiments have been conducted to analyze how to improve the ＇hop points＇ phenomenon of audio-frequecy magnetotelluric （AMT） appeared in the high frequency range. The results suggested that the natural electromagnetic signals, seasonal climate, acquisition time, as well as the length of the pole apparently influenced the data hop of high frequency resistivity. By improving the quality of field measurement data, AMT resistivity in high frequency range reached a real smooth continuity. The study has important guiding significance for the research on permafrost distribution.