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On the calculation of scattered fields by 3-D structure in the time-domain electromagnetic (TDEM) method; Jikan ryoiki denjiho ni okeru sanjigen kozo kara no sanranba no keisan ni tsuite

Abstract

This paper describes the calculation method of 3-D underground structures in TDME method which measures only field components. Recently, FDTD method was developed as calculation method in time domain difference calculus, and the forward analysis accuracy of 3-D fields was rapidly improved. The survey results using a large-scale loop (600m{times}360m) were numerically analyzed by FDTD method. 16 measuring lines were prepared in both X and Y directions, and measuring points were prepared on intersection points of the measuring lines. Since signal current is staircase one, step and impulse responses of the ground were determined by calculating magnetic field and its time differentiation. The rectangular body (120m{times}120m{times}100m) of 0.2S/m in conductivity (5 ohm m in resistivity) was installed 160m under the ground as 3-D resistivity anomaly. The ground of 0.01S/m (100 ohm m) was assumed. Time variation in horizontal magnetic field vector plot of impulse responses of the uniform ground could be observed. The position of the resistivity anomaly could be also determined from spacial differentiation of magnetic field of grid pattern measuring points. 1 ref., 6 figs.
Authors:
Murakami, Y; [1]  Saito, A; Oya, T [2] 
  1. Geological Survey of Japan, Tsukuba (Japan)
  2. Mitsui Mineral Development Engineering Co. Ltd., Tokyo (Japan)
Publication Date:
Oct 01, 1996
Product Type:
Conference
Report Number:
CONF-9610294-
Reference Number:
SCA: 440700; 580000; 990200; PA: NEDO-96:914794; EDB-97:075228; SN: 97001782576
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:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 58 GEOSCIENCES; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; ELECTROMAGNETIC SURVEYS; SCATTERING; FINITE DIFFERENCE METHOD; NUMERICAL ANALYSIS; GEOLOGIC STRUCTURES; SPACE DEPENDENCE; PULSES; RESPONSE FUNCTIONS; EARTH CRUST; ELECTRIC CONDUCTIVITY; ANISOTROPY; UNDERGROUND
OSTI ID:
472699
Research Organizations:
Society of Exploration Geophysicists of Japan, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE97743637; TRN: 96:914794
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. 302-306
Announcement Date:
Jun 03, 1997

Citation Formats

Murakami, Y, Saito, A, and Oya, T. On the calculation of scattered fields by 3-D structure in the time-domain electromagnetic (TDEM) method; Jikan ryoiki denjiho ni okeru sanjigen kozo kara no sanranba no keisan ni tsuite. Japan: N. p., 1996. Web.
Murakami, Y, Saito, A, & Oya, T. On the calculation of scattered fields by 3-D structure in the time-domain electromagnetic (TDEM) method; Jikan ryoiki denjiho ni okeru sanjigen kozo kara no sanranba no keisan ni tsuite. Japan.
Murakami, Y, Saito, A, and Oya, T. 1996. "On the calculation of scattered fields by 3-D structure in the time-domain electromagnetic (TDEM) method; Jikan ryoiki denjiho ni okeru sanjigen kozo kara no sanranba no keisan ni tsuite." Japan.
@misc{etde_472699,
title = {On the calculation of scattered fields by 3-D structure in the time-domain electromagnetic (TDEM) method; Jikan ryoiki denjiho ni okeru sanjigen kozo kara no sanranba no keisan ni tsuite}
author = {Murakami, Y, Saito, A, and Oya, T}
abstractNote = {This paper describes the calculation method of 3-D underground structures in TDME method which measures only field components. Recently, FDTD method was developed as calculation method in time domain difference calculus, and the forward analysis accuracy of 3-D fields was rapidly improved. The survey results using a large-scale loop (600m{times}360m) were numerically analyzed by FDTD method. 16 measuring lines were prepared in both X and Y directions, and measuring points were prepared on intersection points of the measuring lines. Since signal current is staircase one, step and impulse responses of the ground were determined by calculating magnetic field and its time differentiation. The rectangular body (120m{times}120m{times}100m) of 0.2S/m in conductivity (5 ohm m in resistivity) was installed 160m under the ground as 3-D resistivity anomaly. The ground of 0.01S/m (100 ohm m) was assumed. Time variation in horizontal magnetic field vector plot of impulse responses of the uniform ground could be observed. The position of the resistivity anomaly could be also determined from spacial differentiation of magnetic field of grid pattern measuring points. 1 ref., 6 figs.}
place = {Japan}
year = {1996}
month = {Oct}
}