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Estimation of underground structures in Kyoto city by seismic-array observations of microtremors; Bido no array kansoku ni yoru Kyoto shinai no chika kozo tansa

Abstract

Observations of microtremors were carried out to estimate the S-wave velocity structure by using arrays of seismographs around the Kyoto Research Park. The observation points were so arranged that equilateral triangle arrays may be formed with maximum radii at 0.2 km, 0.4 km and 0.8 km respectively with the premises of the Kyoto Research Park as the center. The seismographs have used seven vertical movement components (PELS), and were adjusted to a period of eight seconds. In addition, high-cut filters of 4 Hz were used because the observation areas are located in urban areas with heavy traffic. The analysis has used the spatial self-correlation method as a means to estimate phase velocity of surface waves contained in microtremors. As a result, phase velocity estimation has become possible for frequencies from about 0.4 Hz to 2 Hz, whereas the S-wave velocity structure was estimated to a depth of down to about 900 m by using as reference the result of the reflection method exploration having been carried out in the present areas. In addition, it was suggested that microtremors with frequencies higher than 1 Hz are in unsteady state in terms of time or space. 4 refs., 7 figs., 1 tab.
Authors:
Miyakoshi, K; Kagawa, T; Akazawa, T; [1]  Ogawa, Y; Shimizu, K; [2]  Ejiri, J [3] 
  1. Osaka Soil Test, Osaka (Japan)
  2. Osaka Gas Corp., Osaka (Japan)
  3. Obayashi Corp., Tokyo (Japan)
Publication Date:
Oct 22, 1997
Product Type:
Conference
Report Number:
ETDE/JP-98751022; CONF-9710214-
Reference Number:
SCA: 440700; 580000; PA: JP-97:0G4523; EDB-98:075728; SN: 98001944459
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; SUBSURFACE STRUCTURES; SEISMIC SURVEYS; SEISMOGRAPHS; SEISMIC ARRAYS; SEISMIC SURFACE WAVES; PHASE VELOCITY; SEISMIC S WAVES; URBAN AREAS; ELECTRIC FILTERS; CORRELATIONS
OSTI ID:
622643
Research Organizations:
Society of Exploration Geophysicists of Japan, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE98751022; TRN: JN97G4523
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. 50-53
Announcement Date:

Citation Formats

Miyakoshi, K, Kagawa, T, Akazawa, T, Ogawa, Y, Shimizu, K, and Ejiri, J. Estimation of underground structures in Kyoto city by seismic-array observations of microtremors; Bido no array kansoku ni yoru Kyoto shinai no chika kozo tansa. Japan: N. p., 1997. Web.
Miyakoshi, K, Kagawa, T, Akazawa, T, Ogawa, Y, Shimizu, K, & Ejiri, J. Estimation of underground structures in Kyoto city by seismic-array observations of microtremors; Bido no array kansoku ni yoru Kyoto shinai no chika kozo tansa. Japan.
Miyakoshi, K, Kagawa, T, Akazawa, T, Ogawa, Y, Shimizu, K, and Ejiri, J. 1997. "Estimation of underground structures in Kyoto city by seismic-array observations of microtremors; Bido no array kansoku ni yoru Kyoto shinai no chika kozo tansa." Japan.
@misc{etde_622643,
title = {Estimation of underground structures in Kyoto city by seismic-array observations of microtremors; Bido no array kansoku ni yoru Kyoto shinai no chika kozo tansa}
author = {Miyakoshi, K, Kagawa, T, Akazawa, T, Ogawa, Y, Shimizu, K, and Ejiri, J}
abstractNote = {Observations of microtremors were carried out to estimate the S-wave velocity structure by using arrays of seismographs around the Kyoto Research Park. The observation points were so arranged that equilateral triangle arrays may be formed with maximum radii at 0.2 km, 0.4 km and 0.8 km respectively with the premises of the Kyoto Research Park as the center. The seismographs have used seven vertical movement components (PELS), and were adjusted to a period of eight seconds. In addition, high-cut filters of 4 Hz were used because the observation areas are located in urban areas with heavy traffic. The analysis has used the spatial self-correlation method as a means to estimate phase velocity of surface waves contained in microtremors. As a result, phase velocity estimation has become possible for frequencies from about 0.4 Hz to 2 Hz, whereas the S-wave velocity structure was estimated to a depth of down to about 900 m by using as reference the result of the reflection method exploration having been carried out in the present areas. In addition, it was suggested that microtremors with frequencies higher than 1 Hz are in unsteady state in terms of time or space. 4 refs., 7 figs., 1 tab.}
place = {Japan}
year = {1997}
month = {Oct}
}