TY - CONF TI - Resistivity tomography using borehole of 500m in depth at the seaside site; 500m shin boring wo mochiita kaigan fukin deno hiteiko tomography tansa AB - With an objective to verify exploration methods to identify geological structures to a depth of about 500 m and continuity of fissure zones, a case study was carried out on a resistivity tomography method using ground surface exploration by means of the resistivity method and boreholes of 500 m in depth. The investigated area is consisted of abyssal rocks of the Cretaceous period, where granodiorites of coarse grain and intrusive rocks of small scale are distributed. Fissures on the ground surface have gentle inclination, and are of opening type showing high water permeability. The data analysis has derived apparent resistivities in the Wenner electrode arrangement, the Eltran electrode arrangement and the pole-pole electrode arrangement. The resistivity tomography has derived apparent resistivity in the pole-dipole electrode arrangement which is relatively high in accuracy and strong against noise. As a result of inputting these resistivities and performing an analysis on a two-dimensional resistivity structure, a structure of 100-m scale was made clear, in which difference of the resistivity values is distinct. The result of the resistivity tomography may be thought to have identified the resistivity anomaly of a small scale, although the absolute values show some variation. 4 refs., 5 figs., 2 tabs. AU - "Suzuki, K [Central Research Institute of Electric Power Industry, Tokyo (Japan)]" AU - "Kono, T [Radioactive Waste Management Center, Tokyo (Japan)]" AU - "Chiba, A [Sumitomo Metal Industries, Ltd., Osaka (Japan)]" KW - "58 GEOSCIENCES" KW - "99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS" KW - "44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS" KW - "COMPUTERIZED TOMOGRAPHY" KW - "RESISTIVITY SURVEYS" KW - "BOREHOLES" KW - "GEOLOGIC STRUCTURES" KW - "GEOLOGIC FRACTURES" KW - "CRACKS" KW - "PERMEABILITY" KW - "CRETACEOUS PERIOD" KW - "GRANODIORITES" KW - "PLUTONIC ROCKS" KW - "ELECTRODES" DO - https://doi.org/ UR - https://www.osti.gov/etdeweb/servlets/purl/622651 PB - CY - Japan PY - 1997 DA - 1997-10-22 LA - Japanese J2 - [] VL - C1 - Society of Exploration Geophysicists of Japan, Tokyo (Japan) C2 - C3 - ETDE/JP-98751022; CONF-9710214- C4 - C5 - Available from Society of Exploration Geophysicists of Japan, 2-18, Nakamagome 2-chome, Ota-ku, Tokyo, (Japan); OSTI as DE98751022 L3 - 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 ER -