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High resolution CSMT method for shallow structure; Senjo ochi ni okeru kobunkaino denjiho tansa

Abstract

Electromagnetic exploration methods and seismic reflection methods are conducted for the study of applicability of geophysical exploration to shallow layer geological survey. In the study, four north-south traverse lines are set in 400mtimes200m grassland. Tensor type CSMT methods are employed, a CSMT method using 96kHz-1kHz artificial magnetic fields and an MT method using 1kHz-10kHz natural magnetic fields, for the determination of resistivity distribution in the ground. Distributed in the site are a surface layer composed of gravel-containing sand and silt, andesitic fractured lava, and massive andesite, and the exploration reaches several tens of meters below the surface. The results of CSMT measurements are found to be in agreement with reflection profiles acquired simultaneously with these CSMT measurements. It is found, furthermore, that CSMT profiles help identify reflection waveforms in a domain where reflection is obscure. It is also found that electromagnetic methods are effective in fault logging because they are very sensitive to porosity, or the amount of pore water, which is higher in a domain with subsurface cracks than in the neighborhood without cracks. 1 ref., 4 figs.
Authors:
Yamane, K; Takasugi, S; [1]  Inazaki, S; [2]  Sasaki, Y
  1. GERD Geothermal Energy Research and Development Co. Ltd., Tokyo (Japan)
  2. Geological Survey of Japan, Tsukuba (Japan)
Publication Date:
Oct 22, 1997
Product Type:
Conference
Report Number:
ETDE/JP-98751022; CONF-9710214-
Reference Number:
SCA: 440700; 580000; PA: JP-97:0G4564; EDB-98:075727; SN: 98001944500
Resource Relation:
Conference: 97. SEGJ conference, Butsuri tansa gakkai dai 97 kai (1997 nendo shuki) gakujutsu koenkai, Sapporo (Japan), 22-24 Oct 1997; Other Information: PBD: 22 Oct 1997; Related Information: Is Part Of Proceeding of the 97th (Fall, Fiscal 1997) SEGJ Conference; PB: 371 p.; Butsuri tansa gakkai dai 97 kai (1997 nendo shuki) gakujutsu koenkai koen ronbunshu
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 58 GEOSCIENCES; MAGNETOTELLURIC SURVEYS; SPATIAL RESOLUTION; SUBSURFACE STRUCTURES; ELECTRIC CONDUCTIVITY; GEOLOGIC FAULTS; CRACKS; POROSITY; GEOLOGIC STRUCTURES; SEISMIC SURVEYS; REFLECTION; MAGNETIC FIELDS
OSTI ID:
622735
Research Organizations:
Society of Exploration Geophysicists of Japan, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE98751022; TRN: JN97G4564
Availability:
Available from Society of Exploration Geophysicists of Japan, 2-18, Nakamagome 2-chome, Ota-ku, Tokyo, (Japan); OSTI as DE98751022
Submitting Site:
NEDO
Size:
pp. 235-239
Announcement Date:

Citation Formats

Yamane, K, Takasugi, S, Inazaki, S, and Sasaki, Y. High resolution CSMT method for shallow structure; Senjo ochi ni okeru kobunkaino denjiho tansa. Japan: N. p., 1997. Web.
Yamane, K, Takasugi, S, Inazaki, S, & Sasaki, Y. High resolution CSMT method for shallow structure; Senjo ochi ni okeru kobunkaino denjiho tansa. Japan.
Yamane, K, Takasugi, S, Inazaki, S, and Sasaki, Y. 1997. "High resolution CSMT method for shallow structure; Senjo ochi ni okeru kobunkaino denjiho tansa." Japan.
@misc{etde_622735,
title = {High resolution CSMT method for shallow structure; Senjo ochi ni okeru kobunkaino denjiho tansa}
author = {Yamane, K, Takasugi, S, Inazaki, S, and Sasaki, Y}
abstractNote = {Electromagnetic exploration methods and seismic reflection methods are conducted for the study of applicability of geophysical exploration to shallow layer geological survey. In the study, four north-south traverse lines are set in 400mtimes200m grassland. Tensor type CSMT methods are employed, a CSMT method using 96kHz-1kHz artificial magnetic fields and an MT method using 1kHz-10kHz natural magnetic fields, for the determination of resistivity distribution in the ground. Distributed in the site are a surface layer composed of gravel-containing sand and silt, andesitic fractured lava, and massive andesite, and the exploration reaches several tens of meters below the surface. The results of CSMT measurements are found to be in agreement with reflection profiles acquired simultaneously with these CSMT measurements. It is found, furthermore, that CSMT profiles help identify reflection waveforms in a domain where reflection is obscure. It is also found that electromagnetic methods are effective in fault logging because they are very sensitive to porosity, or the amount of pore water, which is higher in a domain with subsurface cracks than in the neighborhood without cracks. 1 ref., 4 figs.}
place = {Japan}
year = {1997}
month = {Oct}
}