论文标题
局部源电流对平坦地球和球形地球的磁电纤维响应的影响
Effects of localized source currents on magnetotelluric responses of a flat earth and spherical earth
论文作者
论文摘要
当可视化深面电阻率结构（如地球地幔）时，应考虑由于局部源电流的磁铁（MT）响应的变化。地球不是平坦的，而是球形的。然而，根据笛卡尔坐标系中的组件，评估了由局部源电流产生的非均匀的地磁时间变化。为了解决这个问题，本研究评估了平坦地球和球形地球的MT响应中源偏差的差异。明显的电阻率和相位是通过将地球内部的时间周期和电导率设置为200/2000 s和0.001 s/m的电阻率，以及通过更改源电流和观察站之间的垂直和水平距离来计算。尽管两者都从真实值强烈转移，但未观察到平坦地球和球形地球的偏置MT响应的偏差。因此，我们可以处理笛卡尔坐标系中的源偏置，尽管它最初是在球形坐标系统中产生的。
Shifts in magnetotelluric (MT) responses owing to localized source currents should be considered when visualizing deep subsurface resistivity structures such as the earth mantle. The earth is not flat but spherical; nevertheless, non-uniform geomagnetic temporal variations arising from localized source currents are evaluated on the basis of components in a Cartesian coordinate system. To address this issue, this study assesses the difference in source bias within MT responses of a flat earth and spherical earth. Apparent resistivity and phases are calculated by setting the time period and conductivity of the earth interior to 200/2000 s and 0.001 S/m, respectively, and by changing the vertical and horizontal distances between the source current and an observation station. A deviation in the biased MT responses of the flat earth and spherical earth is not observed although both shift strongly from the true values. We can thus treat the source bias in a Cartesian coordinate system although it originally arises in a spherical coordinate system.
