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Array TDEM survey at the Yufuin fault; Yufuin danso ni okeru array shiki TDEM tansa

Abstract

The array arrangement of receivers was studied to improve the resolution of LOTEM (long offset transient electromagnetics) survey. To eliminate the effect of underground structure from a source to a receiving point, continuous array arrangement from a source site is desirable. The survey at the Yufuin fault was carried out by arranging TEM receivers at intervals of 100m from the source. Since the synchronization between transmitting and receiving points by high-precision clock is essential, an amplifier for a flux gate magnetometer capable of measuring at four points at the same time was used. In the south plateau of the Yufuin basin, a relatively high resistivity stratum more than several tens ohm m exists at depth less than several hundreds meter, and a low resistivity stratum less than 10 ohm m exists under that. Those boundary depth increases toward the north up to 950m, and the depth subsequently decreases toward the north until the low resistivity stratum disappears. In addition, the uniform stratum of 1000m deep continues toward the north. Such precise resistivity structure around the fault was obtained by dense arrangement of measuring points. 4 refs., 7 figs.
Authors:
Mogi, T; [1]  Tanaka, Y; Fukuda, Y; [2]  Jomori, N [3] 
  1. Kyushu University, Fukuoka (Japan). Faculty of Engineering
  2. Kyoto University, Kyoto (Japan). Faculty of Science
  3. Chiba Electric Research Institute Co., Chiba (Japan)
Publication Date:
Oct 01, 1996
Product Type:
Conference
Report Number:
CONF-9610294-
Reference Number:
SCA: 150301; 440700; 580000; PA: NEDO-96:914791; EDB-97:072152; SN: 97001782572
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:
15 GEOTHERMAL ENERGY; 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 58 GEOSCIENCES; GEOLOGIC FAULTS; BEPPU GEOTHERMAL FIELD; ELECTROMAGNETIC SURVEYS; MAGNETIC PROBES; CONFIGURATION; ALIGNMENT; SYNCHRONIZATION; SEDIMENTARY BASINS; ELECTRIC CONDUCTIVITY; BOUNDARY LAYERS; DEPTH
OSTI ID:
472696
Research Organizations:
Society of Exploration Geophysicists of Japan, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE97743637; TRN: 96:914791
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. 288-291
Announcement Date:

Citation Formats

Mogi, T, Tanaka, Y, Fukuda, Y, and Jomori, N. Array TDEM survey at the Yufuin fault; Yufuin danso ni okeru array shiki TDEM tansa. Japan: N. p., 1996. Web.
Mogi, T, Tanaka, Y, Fukuda, Y, & Jomori, N. Array TDEM survey at the Yufuin fault; Yufuin danso ni okeru array shiki TDEM tansa. Japan.
Mogi, T, Tanaka, Y, Fukuda, Y, and Jomori, N. 1996. "Array TDEM survey at the Yufuin fault; Yufuin danso ni okeru array shiki TDEM tansa." Japan.
@misc{etde_472696,
title = {Array TDEM survey at the Yufuin fault; Yufuin danso ni okeru array shiki TDEM tansa}
author = {Mogi, T, Tanaka, Y, Fukuda, Y, and Jomori, N}
abstractNote = {The array arrangement of receivers was studied to improve the resolution of LOTEM (long offset transient electromagnetics) survey. To eliminate the effect of underground structure from a source to a receiving point, continuous array arrangement from a source site is desirable. The survey at the Yufuin fault was carried out by arranging TEM receivers at intervals of 100m from the source. Since the synchronization between transmitting and receiving points by high-precision clock is essential, an amplifier for a flux gate magnetometer capable of measuring at four points at the same time was used. In the south plateau of the Yufuin basin, a relatively high resistivity stratum more than several tens ohm m exists at depth less than several hundreds meter, and a low resistivity stratum less than 10 ohm m exists under that. Those boundary depth increases toward the north up to 950m, and the depth subsequently decreases toward the north until the low resistivity stratum disappears. In addition, the uniform stratum of 1000m deep continues toward the north. Such precise resistivity structure around the fault was obtained by dense arrangement of measuring points. 4 refs., 7 figs.}
place = {Japan}
year = {1996}
month = {Oct}
}