TY - JOUR

T1 - Theoretical and methodological substantiation of transient electromagnetic sounding from the Arctic drift ice

AU - Mogilatov, V. S.

AU - Osipova, P. S.

AU - Zlobinsky, A. V.

N1 - Funding Information: This work was financially supported by the Russian Science Foundation, grant No. 18-17-00095. Publisher Copyright: © 2020, V.S. Sobolev IGM, Siberian Branch of the RAS. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/10

Y1 - 2020/10

N2 - Marine geoelectromagnetic sounding with artificial sources is strongly hindered by the influence of a conductive seawater layer. There is only one known wide successful application of electrical prospecting in this field - Controlled Source Electromagnetic Method (CSEM). However, this method has unfortunate limitations: the need to submerge an electromagnetic probe to the bottom of a deep (more than 1000 m) sea and the great rafting (~15 km). The method is not applicable in an ice-covered sea. Deep sounding from the sea surface and, hence, from the ice surface is possible if the TM polarization field is used. This field is generated by a vertical electric line (VEL) or a circular electric dipole (CED). The former has drawbacks even when it is used at sea. At the same time, a CED is efficient in one-dimensional and three-dimensional media in frequency and time modes. We have developed a three-dimensional mathematical tool for the CED field in the Born approximation, which is quite adequate in a conductive section with deep local inhomogeneities. The research is carried out within the framework of a geophysical project using the Arctic driftices.

AB - Marine geoelectromagnetic sounding with artificial sources is strongly hindered by the influence of a conductive seawater layer. There is only one known wide successful application of electrical prospecting in this field - Controlled Source Electromagnetic Method (CSEM). However, this method has unfortunate limitations: the need to submerge an electromagnetic probe to the bottom of a deep (more than 1000 m) sea and the great rafting (~15 km). The method is not applicable in an ice-covered sea. Deep sounding from the sea surface and, hence, from the ice surface is possible if the TM polarization field is used. This field is generated by a vertical electric line (VEL) or a circular electric dipole (CED). The former has drawbacks even when it is used at sea. At the same time, a CED is efficient in one-dimensional and three-dimensional media in frequency and time modes. We have developed a three-dimensional mathematical tool for the CED field in the Born approximation, which is quite adequate in a conductive section with deep local inhomogeneities. The research is carried out within the framework of a geophysical project using the Arctic driftices.

KW - Arctic

KW - Born approximation

KW - Circular electric dipole

KW - Drift ice

KW - Marine geoelectromagnetic sounding

KW - Vertical electric line

KW - circular electric dipole

KW - marine geoelectromagnetic sounding

KW - drift ice

KW - vertical electric line

UR - http://www.scopus.com/inward/record.url?scp=85095784800&partnerID=8YFLogxK

U2 - 10.15372/RGG2019130

DO - 10.15372/RGG2019130

M3 - Article

AN - SCOPUS:85095784800

VL - 61

SP - 1187

EP - 1195

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 10

ER -