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Velocity structure of Nojima-fault by VSP method; VSP ho ni yoru Nojima danso no sokudo kozo

Abstract

In order to investigate in detail structures of the fractured fault band, the VSP tests were conducted using a 750m deep borehole penetrating the Nojima fault in Awaji Island. The borehole penetrates the fault clay band at a depth of 624m in the Hirabayashi area. The offset VSP survey, conducted by the aid of hydrophone through the naked borehole, detects many characteristic phenomena resulting from the fault fracture. Largely fractured lithofacies are found by the core observation at a depth in a range from 557 to 673m. P-waves propagate at 4.6 and 5.1km/s above and below the fractured band, respectively. The fractured band is subdivided into 2 sections, both being of low speed of 4.5 and 3.1km/s. The X1 and X2 phases resulting from the fault fracture are also observed, above and below the fractured band. The causes for these wave phases are now under investigation. 4 figs.
Authors:
Kuwahara, Y; Ito, H; Kiguchi, T; Miyazaki, T [1] 
  1. Geological Survey of Japan, Tsukuba (Japan)
Publication Date:
May 01, 1996
Product Type:
Conference
Report Number:
CONF-9605233-
Reference Number:
SCA: 580000; 440700; PA: NEDO-96:913439; EDB-96:173387; SN: 96001687045
Resource Relation:
Conference: 94. SEGJ (The Society of Exploration Geophysicists of Japan) Conference, Butsuri tansa gakkai dai 94 kai (1996 nendo shunki) gakujutsu koenkai, Tokyo (Japan), 15-17 May 1996; Other Information: PBD: May 1996; Related Information: Is Part Of Proceedings of the 94th SEGJ (The Society of Exploration Geophysicists of Japan) Conference; PB: 475 p.; Butsuri tansa gakkai dai 94 kai (1996 nendo shunki) gakujutsu koenkai koen ronbunshu
Subject:
58 GEOSCIENCES; 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; SEISMIC SURVEYS; BOREHOLES; GEOLOGIC FAULTS; P WAVES; GEOLOGIC FRACTURES; CLAYS; VELOCITY; DRILL CORES; INSPECTION
OSTI ID:
395475
Research Organizations:
Society of Exploration Geophysicists of Japan, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE97709027; TRN: 96:913439
Availability:
Available from The Society of Exploration Geophysicists of Japan, 2-18, Nakamagome 2-chome, Ota-ku, Tokyo, Japan; OSTI as DE97709027
Submitting Site:
NEDO
Size:
pp. 39-40
Announcement Date:

Citation Formats

Kuwahara, Y, Ito, H, Kiguchi, T, and Miyazaki, T. Velocity structure of Nojima-fault by VSP method; VSP ho ni yoru Nojima danso no sokudo kozo. Japan: N. p., 1996. Web.
Kuwahara, Y, Ito, H, Kiguchi, T, & Miyazaki, T. Velocity structure of Nojima-fault by VSP method; VSP ho ni yoru Nojima danso no sokudo kozo. Japan.
Kuwahara, Y, Ito, H, Kiguchi, T, and Miyazaki, T. 1996. "Velocity structure of Nojima-fault by VSP method; VSP ho ni yoru Nojima danso no sokudo kozo." Japan.
@misc{etde_395475,
title = {Velocity structure of Nojima-fault by VSP method; VSP ho ni yoru Nojima danso no sokudo kozo}
author = {Kuwahara, Y, Ito, H, Kiguchi, T, and Miyazaki, T}
abstractNote = {In order to investigate in detail structures of the fractured fault band, the VSP tests were conducted using a 750m deep borehole penetrating the Nojima fault in Awaji Island. The borehole penetrates the fault clay band at a depth of 624m in the Hirabayashi area. The offset VSP survey, conducted by the aid of hydrophone through the naked borehole, detects many characteristic phenomena resulting from the fault fracture. Largely fractured lithofacies are found by the core observation at a depth in a range from 557 to 673m. P-waves propagate at 4.6 and 5.1km/s above and below the fractured band, respectively. The fractured band is subdivided into 2 sections, both being of low speed of 4.5 and 3.1km/s. The X1 and X2 phases resulting from the fault fracture are also observed, above and below the fractured band. The causes for these wave phases are now under investigation. 4 figs.}
place = {Japan}
year = {1996}
month = {May}
}