Research output: Contribution to journal › Article › peer-review
Transient electric field response to a uniform, magnetically viscous earth excited by a grounded line source. / Antonov, E. Yu; Kozhevnikov, N. O.
In: Russian Geology and Geophysics, Vol. 58, No. 7, 01.07.2017, p. 855-863.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Transient electric field response to a uniform, magnetically viscous earth excited by a grounded line source
AU - Antonov, E. Yu
AU - Kozhevnikov, N. O.
PY - 2017/7/1
Y1 - 2017/7/1
N2 - 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. (C) 2017, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.
AB - 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. (C) 2017, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.
KW - equatorial array
KW - grounded line
KW - magnetic viscosity
KW - superparamagnetism
KW - transient response
KW - uniform earth
KW - TEM RESPONSES
KW - RELAXATION
KW - VISCOSITY
KW - LAYER
KW - ELECTROMAGNETIC RESPONSE
UR - http://www.scopus.com/inward/record.url?scp=85030466101&partnerID=8YFLogxK
U2 - 10.1016/j.rgg.2017.06.008
DO - 10.1016/j.rgg.2017.06.008
M3 - Article
AN - SCOPUS:85030466101
VL - 58
SP - 855
EP - 863
JO - Russian Geology and Geophysics
JF - Russian Geology and Geophysics
SN - 1068-7971
IS - 7
ER -
ID: 9896394