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Subsurface displacement of the Tachikawa fault; Tachikawa danso no chika shinbu ni okeru danso hen`i

Abstract

Seismic exploration using the reflection method was carried out at the central section of the Tachikawa fault located in the western part of the Musashino high plain spreading over Tokyo and Saitama Prefectures. The course of traverse was set on a road running in the east to west direction, which crosses the running direction of the Tachikawa fault in Sunagawa, Tachikawa City by about 65 degrees. The area near the course of traverse is a terraced alluvial fan, with the nature of its surface soil consisted of a gravelly bed of the Quaternary period. In order to identify the fault structure in detail, the focal point interval was set to 5 m, being half of the vibration receiving point interval of 10 m. The CMP was defined at a 2.5-m interval rather than a 5-m interval. The S/N ratio of the derived data was found not good. This is because of scattering of seismic energy into the gravelly bed with a thickness of about 100m in the shallow portion and because of noise from passing vehicles. The data processing was applied with correlation, geometry, static correction, velocity analysis and CMP polymerization to have prepared a preliminary CMP polymerization time cross  More>>
Authors:
Yamaguchi, K; Kano, N; Kiguchi, T; Tanaka, A; [1]  Sato, H [2] 
  1. Geological Survey of Japan, Tsukuba (Japan)
  2. The University of Tokyo, Tokyo (Japan). Earthquake Research Institute
Publication Date:
Oct 22, 1997
Product Type:
Conference
Report Number:
ETDE/JP-98751022; CONF-9710214-
Reference Number:
SCA: 440700; 580000; PA: JP-97:0G4516; EDB-98:075720; SN: 98001944452
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; GEOLOGIC FAULTS; SEISMIC SURVEYS; REFLECTION; SEISMIC ARRAYS; SIGNAL-TO-NOISE RATIO; QUATERNARY PERIOD; CONGLOMERATES; ALLUVIAL DEPOSITS; GEOLOGIC FRACTURES; DEPTH
OSTI ID:
622637
Research Organizations:
Society of Exploration Geophysicists of Japan, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE98751022; TRN: JN97G4516
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. 20-22
Announcement Date:
Jul 24, 1998

Citation Formats

Yamaguchi, K, Kano, N, Kiguchi, T, Tanaka, A, and Sato, H. Subsurface displacement of the Tachikawa fault; Tachikawa danso no chika shinbu ni okeru danso hen`i. Japan: N. p., 1997. Web.
Yamaguchi, K, Kano, N, Kiguchi, T, Tanaka, A, & Sato, H. Subsurface displacement of the Tachikawa fault; Tachikawa danso no chika shinbu ni okeru danso hen`i. Japan.
Yamaguchi, K, Kano, N, Kiguchi, T, Tanaka, A, and Sato, H. 1997. "Subsurface displacement of the Tachikawa fault; Tachikawa danso no chika shinbu ni okeru danso hen`i." Japan.
@misc{etde_622637,
title = {Subsurface displacement of the Tachikawa fault; Tachikawa danso no chika shinbu ni okeru danso hen`i}
author = {Yamaguchi, K, Kano, N, Kiguchi, T, Tanaka, A, and Sato, H}
abstractNote = {Seismic exploration using the reflection method was carried out at the central section of the Tachikawa fault located in the western part of the Musashino high plain spreading over Tokyo and Saitama Prefectures. The course of traverse was set on a road running in the east to west direction, which crosses the running direction of the Tachikawa fault in Sunagawa, Tachikawa City by about 65 degrees. The area near the course of traverse is a terraced alluvial fan, with the nature of its surface soil consisted of a gravelly bed of the Quaternary period. In order to identify the fault structure in detail, the focal point interval was set to 5 m, being half of the vibration receiving point interval of 10 m. The CMP was defined at a 2.5-m interval rather than a 5-m interval. The S/N ratio of the derived data was found not good. This is because of scattering of seismic energy into the gravelly bed with a thickness of about 100m in the shallow portion and because of noise from passing vehicles. The data processing was applied with correlation, geometry, static correction, velocity analysis and CMP polymerization to have prepared a preliminary CMP polymerization time cross section. As a result, it was elucidated that the Tachikawa fault forms a bend zone or a crush zone under the ground, and continues down to a great depth at a high angle. 9 refs., 3 figs.}
place = {Japan}
year = {1997}
month = {Oct}
}