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VISUALIZATION OF MAGNETOTELLURIC DATA WITH APPARENT VELOCITY METHOD

机译：视速度法可视化大地磁数据

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摘要

Magnetotelluric (MT) field data are usually presented as plots of amplitude and phase MTsounding data vs frequency. Visualization of resistivity changes of geoelectric complexes with theuse of apparent resistivity and phase curves give qualitative results only. Quantitative interpretationof MT sounding curves is needed to get geoelectric parameters. For a ID horizontally layered earth,amplitude curves (apparent resistivity curves) and phase curves can be transformed into apparentvelocity curves versus depth of EM field penetration into the conducting earth.Apparent velocitycurves can be approximated by straight-line segments corresponding to homogeneous geoelectriclayer complexes. Each segment of the apparent velocity curve (with a given angle of inclination) isrelated with the resistivity and thickness of individual geoelectric complexes. For heterogeneous earth(2D or 3D) vertical component of the magnetic field is directly connected with boundary of geo-electric complexes. It can be used to express components of vectors of apparent velocity. For a 1Dhorizontally layered earth, a vector of apparent velocity has only the vertical component. For hetero-geneous earth horizontal components of apparent velocity also are inducted. The angle of inclinationof the total vector of velocity and its value depend on the geometry of studied structure.
机译：大地电磁（MT）场数据通常表示为幅度和相位MT声音数据与频率的关系图。使用视电阻率和相曲线可视化地电复合体的电阻率变化仅给出定性结果。需要对MT测深曲线进行定量解释才能获得地电参数。对于ID水平层的地球，可以将振幅曲线（视电阻率曲线）和相位曲线转换为视速度曲线，并将其与EM场渗透到导电土中的深度进行比较。视速度曲线可以通过对应于均匀地电层复合体的直线段来近似。视在速度曲线的每个部分（具有给定的倾斜角）都与单个地电复合体的电阻率和厚度相关。对于异质地球（2D或3D），磁场的垂直分量直接与地电复合体的边界相连。它可以用来表达视在速度矢量的分量。对于1个水平分层的地球，视在速度矢量仅具有垂直分量。对于非均质地球，还引入了视在速度的水平分量。总速度矢量的倾角及其值取决于所研究结构的几何形状。

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