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Investigation of local-dimensional galvanic distortion on MT data in the central part of Northeastern Japan; Tohoku chiho no MT data ni mirareru kyokushoteki sanjigensei no eikyo

Abstract

Groom-Bailey decomposition analysis was carried out to investigate regional 3-D galvanic distortion on MT data in the central part of Northeastern Japan. Measuring sites were located nearly along the east-west line crossing Northeastern Japan. Three measuring lines (A, B, C) from the north to the south were prepared, and only data on the C line were analyzed in this paper. As a result, twist and shear were estimated to be not zero depending on local distortion in most of the sites. It was thus clarified that this method is not always perfect. This method was effective for regional 2-D structures, however, its application was doubtful to complicated 3-D underground structures in Japan. In order to obtain more accurate results, 2-D analysis using the impedance including no local distortion effect was necessary after the preliminary Groom-Bailey decomposition analysis. The direction of the wide area geological structure of Northeastern Japan was estimated to be N-S direction near NNW-SSE one. 6 refs., 12 figs., 1 tab.
Authors:
Kawakami, N; Takasugi, S; [1]  Fujinawa, Y [2] 
  1. GERD Geothermal Energy Research and Development Co. Ltd., Tokyo (Japan)
  2. National Research Institute for Disaster Prevention, Tsukuba (Japan)
Publication Date:
Oct 01, 1996
Product Type:
Miscellaneous
Report Number:
CONF-9610294-
Reference Number:
SCA: 580000; 440700; 990200; PA: NEDO-96:914788; EDB-97:076107; SN: 97001782566
Resource Relation:
Conference: 95. SEGJ conference, Butsuri tansa gakkai dai 95 kai (1996 nendo shuki) gakujutsu koenkai, Kyoto (Japan), 21-23 Oct 1996; Other Information: PBD: Oct 1996; Related Information: Is Part Of Proceedings of the 95th SEGJ Conference; PB: 344 p.; Butsuri tansa gakkai dai 95 kai (1996 nendo shuki) gakujutsu koenkai koen ronbunshu
Subject:
58 GEOSCIENCES; 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; BOREAL REGIONS; MAGNETOTELLURIC SURVEYS; NUMERICAL DATA; REGIONAL ANALYSIS; SPACE DEPENDENCE; ANISOTROPY; SHEAR; TORSION; DEFORMATION; ACCURACY; MECHANICAL IMPEDANCE; CORRECTIONS
OSTI ID:
472693
Research Organizations:
Society of Exploration Geophysicists of Japan, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE97743637; TRN: 96:914788
Availability:
Available from The Society of Exploration Geophysicists of Japan, 2-18, Nakamagome 2-chome, Ota-ku, Tokyo, Japan; OSTI as DE97743637
Submitting Site:
NEDO
Size:
pp. 274-278
Announcement Date:
Jun 03, 1997

Citation Formats

Kawakami, N, Takasugi, S, and Fujinawa, Y. Investigation of local-dimensional galvanic distortion on MT data in the central part of Northeastern Japan; Tohoku chiho no MT data ni mirareru kyokushoteki sanjigensei no eikyo. Japan: N. p., 1996. Web.
Kawakami, N, Takasugi, S, & Fujinawa, Y. Investigation of local-dimensional galvanic distortion on MT data in the central part of Northeastern Japan; Tohoku chiho no MT data ni mirareru kyokushoteki sanjigensei no eikyo. Japan.
Kawakami, N, Takasugi, S, and Fujinawa, Y. 1996. "Investigation of local-dimensional galvanic distortion on MT data in the central part of Northeastern Japan; Tohoku chiho no MT data ni mirareru kyokushoteki sanjigensei no eikyo." Japan.
@misc{etde_472693,
title = {Investigation of local-dimensional galvanic distortion on MT data in the central part of Northeastern Japan; Tohoku chiho no MT data ni mirareru kyokushoteki sanjigensei no eikyo}
author = {Kawakami, N, Takasugi, S, and Fujinawa, Y}
abstractNote = {Groom-Bailey decomposition analysis was carried out to investigate regional 3-D galvanic distortion on MT data in the central part of Northeastern Japan. Measuring sites were located nearly along the east-west line crossing Northeastern Japan. Three measuring lines (A, B, C) from the north to the south were prepared, and only data on the C line were analyzed in this paper. As a result, twist and shear were estimated to be not zero depending on local distortion in most of the sites. It was thus clarified that this method is not always perfect. This method was effective for regional 2-D structures, however, its application was doubtful to complicated 3-D underground structures in Japan. In order to obtain more accurate results, 2-D analysis using the impedance including no local distortion effect was necessary after the preliminary Groom-Bailey decomposition analysis. The direction of the wide area geological structure of Northeastern Japan was estimated to be N-S direction near NNW-SSE one. 6 refs., 12 figs., 1 tab.}
place = {Japan}
year = {1996}
month = {Oct}
}