Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5786979 | Russian Geology and Geophysics | 2017 | 9 Pages |
Abstract
A new method is suggested for calculation of transient electric field response to conducting magnetically viscous earth excited by a grounded line source. Calculation algorithms are implemented in the computer program FwLL_MV. Using a uniform, conducting magnetically viscous half-space as an earth model, we have shown that magnetic relaxation affects the TEM response of equatorial and in-line arrays. As in the case of loop arrays, apparent resistivity steadily decreases with time. The higher the half-space resistivity and the shorter the offset, the earlier the voltage and the apparent resistivity begin to decrease as 1/t. Magnetic relaxation and decay of eddy currents are independent processes within the range of resistivities typical of rocks.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geology
Authors
E.Yu. Antonov, N.O. Kozhevnikov,