Abstract: Effect of topography is one of the main problems for the MTS work in mountain areas. To this problem we have made theoretical analyses and numerical modeling by using a two dimensional model in homogeneous halfspace. Our results indicate that effect of topography depends on the type of MTS data, mode of polarization, electromagnetic wave period of field source, survey site, as well as the form and scale of topography. In addition, we also give the estimates on the extent of topography effect in terms of calculations by a cliff model.

Key words: Magnetotelluric sounding, Numerical modeling, Effect of topography

摘要： 地形影响是山区MTS工作的主要问题之一,对此做了理论分析并用均匀半空间表面二维地形模型进行了数值模拟。结果表明,地形影响不仅与MTS资料的种类、极化模式、场源电磁波周期及测点位置有关,而且还依赖于不同的地形形态和尺度。此外,还根据悬崖模型计算,给出了关于地形影响范围的估计。

关键词: 大地电磁测深, 数值模拟, 地形影响