Fast‐decaying IP in frozen unconsolidated rocks and potentialities for its use in permafrost‐related TEM studies
ABSTRACT We investigate the early time induced polarization (IP) phenomenon in frozen unconsolidated rocks and its association with transient electromagnetic (TEM) signals measured in northern regions. The distinguishing feature of these signals is the distortion of the monotony or sign reversals in...
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crwiley:10.1111/j.1365-2478.2006.00540.x 2024-06-02T08:13:08+00:00 Fast‐decaying IP in frozen unconsolidated rocks and potentialities for its use in permafrost‐related TEM studies Kozhevnikov, N.O. Antonov, E.Y. 2006 http://dx.doi.org/10.1111/j.1365-2478.2006.00540.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2478.2006.00540.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2478.2006.00540.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Geophysical Prospecting volume 54, issue 4, page 383-397 ISSN 0016-8025 1365-2478 journal-article 2006 crwiley https://doi.org/10.1111/j.1365-2478.2006.00540.x 2024-05-03T10:56:53Z ABSTRACT We investigate the early time induced polarization (IP) phenomenon in frozen unconsolidated rocks and its association with transient electromagnetic (TEM) signals measured in northern regions. The distinguishing feature of these signals is the distortion of the monotony or sign reversals in the time range from a few tens to a few hundreds of microseconds. In simulating TEM data, the IP effects in frozen ground were attributed to the dielectric relaxation phenomenon rather than to the frequency‐dependent conductivity. This enabled us to use laboratory experimental data available in the literature on dielectric spectroscopy of frozen rocks. In our studies we focused on simulating the transient response of a coincident‐loop configuration in three simple models: (i) a homogeneous frozen earth (half‐space); (ii) a two‐layered earth with the upper layer frozen; (iii) a two‐layered earth with the upper layer unfrozen. The conductivities of both frozen and unfrozen ground were assumed to exhibit no frequency dispersion, whereas the dielectric permittivity of frozen ground was assumed to be described by the Debye model. To simplify the presentation and the comparison analysis of the synthetic data, the TEM response of a frozen polarizable earth was normalized to that of a non‐polarizable earth having the same structure and resistivities as the polarizable earth. The effect of the dielectric relaxation on a TEM signal is marked by a clearly defined minimum. Its time coordinate t min is approximately three times larger than the dielectric relaxation time constant τ. This suggests the use of t min for direct estimation of τ, which, in turn, is closely associated with the temperature of frozen unconsolidated rock. The ordinate of the minimum is directly proportional to the static dielectric permittivity of frozen earth. Increasing the resistivity of a frozen earth and/or decreasing the loop size results in a progressively stronger effect of the dielectric relaxation on the TEM signal. In the case of unfrozen earth, ... Article in Journal/Newspaper permafrost Wiley Online Library Geophysical Prospecting 54 4 383 397 |
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ABSTRACT We investigate the early time induced polarization (IP) phenomenon in frozen unconsolidated rocks and its association with transient electromagnetic (TEM) signals measured in northern regions. The distinguishing feature of these signals is the distortion of the monotony or sign reversals in the time range from a few tens to a few hundreds of microseconds. In simulating TEM data, the IP effects in frozen ground were attributed to the dielectric relaxation phenomenon rather than to the frequency‐dependent conductivity. This enabled us to use laboratory experimental data available in the literature on dielectric spectroscopy of frozen rocks. In our studies we focused on simulating the transient response of a coincident‐loop configuration in three simple models: (i) a homogeneous frozen earth (half‐space); (ii) a two‐layered earth with the upper layer frozen; (iii) a two‐layered earth with the upper layer unfrozen. The conductivities of both frozen and unfrozen ground were assumed to exhibit no frequency dispersion, whereas the dielectric permittivity of frozen ground was assumed to be described by the Debye model. To simplify the presentation and the comparison analysis of the synthetic data, the TEM response of a frozen polarizable earth was normalized to that of a non‐polarizable earth having the same structure and resistivities as the polarizable earth. The effect of the dielectric relaxation on a TEM signal is marked by a clearly defined minimum. Its time coordinate t min is approximately three times larger than the dielectric relaxation time constant τ. This suggests the use of t min for direct estimation of τ, which, in turn, is closely associated with the temperature of frozen unconsolidated rock. The ordinate of the minimum is directly proportional to the static dielectric permittivity of frozen earth. Increasing the resistivity of a frozen earth and/or decreasing the loop size results in a progressively stronger effect of the dielectric relaxation on the TEM signal. In the case of unfrozen earth, ... |
format |
Article in Journal/Newspaper |
author |
Kozhevnikov, N.O. Antonov, E.Y. |
spellingShingle |
Kozhevnikov, N.O. Antonov, E.Y. Fast‐decaying IP in frozen unconsolidated rocks and potentialities for its use in permafrost‐related TEM studies |
author_facet |
Kozhevnikov, N.O. Antonov, E.Y. |
author_sort |
Kozhevnikov, N.O. |
title |
Fast‐decaying IP in frozen unconsolidated rocks and potentialities for its use in permafrost‐related TEM studies |
title_short |
Fast‐decaying IP in frozen unconsolidated rocks and potentialities for its use in permafrost‐related TEM studies |
title_full |
Fast‐decaying IP in frozen unconsolidated rocks and potentialities for its use in permafrost‐related TEM studies |
title_fullStr |
Fast‐decaying IP in frozen unconsolidated rocks and potentialities for its use in permafrost‐related TEM studies |
title_full_unstemmed |
Fast‐decaying IP in frozen unconsolidated rocks and potentialities for its use in permafrost‐related TEM studies |
title_sort |
fast‐decaying ip in frozen unconsolidated rocks and potentialities for its use in permafrost‐related tem studies |
publisher |
Wiley |
publishDate |
2006 |
url |
http://dx.doi.org/10.1111/j.1365-2478.2006.00540.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2478.2006.00540.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2478.2006.00540.x |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Geophysical Prospecting volume 54, issue 4, page 383-397 ISSN 0016-8025 1365-2478 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-2478.2006.00540.x |
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Geophysical Prospecting |
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54 |
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383 |
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397 |
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