Utilization of Effective Apparent Resistivity in Magnetotelluric Data Processing and Interpretation

摘要

Effective apparent resistivity is correspondent to the modulus of magnetotelluric response impedance tensor matrix. It is a invariable under the coordinate rotation. Under one dimensional (1-D) condition, It is equal to the normal apparent resistivity p_a, when to two dimensional condition, it is the geometry average of apparent resistivity of TE mode (pte) and TM mode (ptm), which has the dimensionality reduction property. The parallel moving algorithm can used to do static correction, as effective apparent resistivity curl shape was not affected by the static effect. At the same time, it is irrelative to coordinate rotation, so the inverse deviation can be avoided in the effective apparent resistivity two-dimensional (2-D) inversion, because of the incorrect polarization mode discrimination. So the utilization of effective apparent resistivity in processing and interpretation of the magnetotelluric sounding data was recommended.