Abstract
With an objective to discuss applicability of resistivity imaging using electromagnetic migration to detection of underground cavity, an applicability test was carried out on calculation of a numerical model and measurement data. By using the numerical model, a calculation was performed on a hypothetical case that a cubic cavity with sides each at 40 m exists in a homogenous medium of 200 ohm-m, with the cavity top located 20 m below the ground surface. As a result, it was possible to structure in a very short calculation time an image of the cavity which cannot be identified by one-dimensional inverse analysis. In the case of this cavity, a center of the image was structured on its lower face. It was shown that a location to indicate the image must be changed according to difference in the measurement locations. In a test on data measured in an underground cavity in the city of Utsunomiya, Tochigi Prefecture, it was found that the result may vary largely depending on structure of the background necessary for migration. Referring to a result of measurement performed in a location in which no target has been set can provide a good result. 5 refs., 7 figs., 1
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Shiga, N;
Wada, K;
Tsutsui, T;
[1]
Hara, T
[2]
- Mitsui Mineral Development Engineering Co. Ltd., Tokyo (Japan)
- Toda Corp., Tokyo (Japan)
Citation Formats
Shiga, N, Wada, K, Tsutsui, T, and Hara, T.
Cavity detection based on EM migration of TEM data; TEM ho data no denji migration ni yoru kudo kenshutsu no kokoromi.
Japan: N. p.,
1997.
Web.
Shiga, N, Wada, K, Tsutsui, T, & Hara, T.
Cavity detection based on EM migration of TEM data; TEM ho data no denji migration ni yoru kudo kenshutsu no kokoromi.
Japan.
Shiga, N, Wada, K, Tsutsui, T, and Hara, T.
1997.
"Cavity detection based on EM migration of TEM data; TEM ho data no denji migration ni yoru kudo kenshutsu no kokoromi."
Japan.
@misc{etde_522645,
title = {Cavity detection based on EM migration of TEM data; TEM ho data no denji migration ni yoru kudo kenshutsu no kokoromi}
author = {Shiga, N, Wada, K, Tsutsui, T, and Hara, T}
abstractNote = {With an objective to discuss applicability of resistivity imaging using electromagnetic migration to detection of underground cavity, an applicability test was carried out on calculation of a numerical model and measurement data. By using the numerical model, a calculation was performed on a hypothetical case that a cubic cavity with sides each at 40 m exists in a homogenous medium of 200 ohm-m, with the cavity top located 20 m below the ground surface. As a result, it was possible to structure in a very short calculation time an image of the cavity which cannot be identified by one-dimensional inverse analysis. In the case of this cavity, a center of the image was structured on its lower face. It was shown that a location to indicate the image must be changed according to difference in the measurement locations. In a test on data measured in an underground cavity in the city of Utsunomiya, Tochigi Prefecture, it was found that the result may vary largely depending on structure of the background necessary for migration. Referring to a result of measurement performed in a location in which no target has been set can provide a good result. 5 refs., 7 figs., 1 tab.}
place = {Japan}
year = {1997}
month = {May}
}
title = {Cavity detection based on EM migration of TEM data; TEM ho data no denji migration ni yoru kudo kenshutsu no kokoromi}
author = {Shiga, N, Wada, K, Tsutsui, T, and Hara, T}
abstractNote = {With an objective to discuss applicability of resistivity imaging using electromagnetic migration to detection of underground cavity, an applicability test was carried out on calculation of a numerical model and measurement data. By using the numerical model, a calculation was performed on a hypothetical case that a cubic cavity with sides each at 40 m exists in a homogenous medium of 200 ohm-m, with the cavity top located 20 m below the ground surface. As a result, it was possible to structure in a very short calculation time an image of the cavity which cannot be identified by one-dimensional inverse analysis. In the case of this cavity, a center of the image was structured on its lower face. It was shown that a location to indicate the image must be changed according to difference in the measurement locations. In a test on data measured in an underground cavity in the city of Utsunomiya, Tochigi Prefecture, it was found that the result may vary largely depending on structure of the background necessary for migration. Referring to a result of measurement performed in a location in which no target has been set can provide a good result. 5 refs., 7 figs., 1 tab.}
place = {Japan}
year = {1997}
month = {May}
}