局部化源电流对平面地球和球形地球大地电磁响应的影响
Effects of localized source currents on magnetotelluric responses of a flat earth and spherical earth
摘要：
在对地幔等深部地下电阻率结构进行可视化时，应考虑局部源电流引起的大地电磁（MT）响应的变化。地球不是平的，而是球形的，然而，非均匀的地磁时间变化所产生的本地化源电流的基础上，在笛卡尔坐标系的组件进行评估。为了解决这个问题，本研究评估了源偏置的差异内MT响应的一个平坦的地球和球形地球。视电阻率和相位是通过将地球内部的时间周期和电导率分别设置为200/2000 s和0.001 S/m，并通过改变源电流与观测站之间的垂直和水平距离来计算的。没有观察到平面地球和球形地球的有偏MT响应的偏差，尽管两者都强烈地偏离真实值。因此，我们可以在笛卡尔坐标系中处理源偏置，尽管它最初是在球面坐标系中产生的。
英文摘要：
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.
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