PRELIMINARY-ANALYSIS FOR EVALUATION OF LOCAL SITE EFFECTS FROM STRONG MOTION SPECTRA BY AN INVERSION METHOD
被引:33
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作者:
KATO, K
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机构:Kobori Research Complex, Kajima Corporation, Minato-ku
KATO, K
TAKEMURA, M
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机构:Kobori Research Complex, Kajima Corporation, Minato-ku
TAKEMURA, M
IKEURA, T
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机构:Kobori Research Complex, Kajima Corporation, Minato-ku
IKEURA, T
URAO, K
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机构:Kobori Research Complex, Kajima Corporation, Minato-ku
URAO, K
UETAKE, T
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机构:Kobori Research Complex, Kajima Corporation, Minato-ku
UETAKE, T
机构:
[1] Kobori Research Complex, Kajima Corporation, Minato-ku
[2] Kajima Technical Research Institute, Kajima Corporation, Chofu
[3] Information Processing Center, Kajima Corporation, Minato-ku
[4] Tokyo Electric Power Company, Chiyoda-ku
来源:
JOURNAL OF PHYSICS OF THE EARTH
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1992年
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40卷
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01期
关键词:
D O I:
10.4294/jpe1952.40.175
中图分类号:
P [天文学、地球科学];
学科分类号:
07 ;
摘要:
Simultaneous separation of source, propagation path, and local site effects from observed strong motion records is carried out by an inversion method in the frequency range from 1 to 10 Hz for the purpose of empirical evaluation of the local site effects in different geological conditions. The analyzed data are S-wave portions of 167 accelerograms from 20 events observed at 7 stations along the Pacific coast of southern Tohoku and Kanto districts, Japan. These events are shallow earthquakes with magnitude from 4.0 to 6.7 and with hypocentral distance from 43 to 243 km. A linear inversion method is applied to the logarithm of the observed spectra, and solutions for source spectra, inelasticity factor of propagation path for S-waves (Q(s)-value). and factor of site amplification at each station are obtained in least squares sense. In the inversion, the factor of site amplification at a reference station (KDG) on an outcrop of bedrock is constrained to 2. The factors of site amplification G(j)(f) obtained in the present study at two borehole stations are verified by comparisons with the theoretical transfer functions from bedrock to observation points. Obtained G(j)(f) values increase with decrease of shear-wave velocities of the ground layers at the observation points. Q(s)-value obtained shows frequency dependency of the form Q(s)(f) - 60 f1.0, and amplitudes of displacement source spectra have omega-square decay in the frequency range higher than the corner frequency. The site effect at the reference station (KDG) is also discussed in detail to examine the validity of the constraint condition adopted in the present study. On the basis of the mean acceleration spectrum obtained from the observed records and the calculated topographical effects by the two-dimensional BEM model at KDG, it is concluded that the constraint condition is satisfactory in the frequency range lower than 6 Hz. In the range higher than 6 Hz, it is suggested that KDG is influenced by the topographical effects.
机构:
Rio De Janeiro Fed Univ, Ocean Engn Program, COPPE, UFRJ, Rio De Janeiro, BrazilRio De Janeiro Fed Univ, Ocean Engn Program, COPPE, UFRJ, Rio De Janeiro, Brazil
Brasil-Correa, Yuri O.
Violante-Carvalho, Nelson
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Rio De Janeiro Fed Univ, Ocean Engn Program, COPPE, UFRJ, Rio De Janeiro, BrazilRio De Janeiro Fed Univ, Ocean Engn Program, COPPE, UFRJ, Rio De Janeiro, Brazil
Violante-Carvalho, Nelson
Santos, Felipe M.
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Rio De Janeiro Fed Univ, Ocean Engn Program, COPPE, UFRJ, Rio De Janeiro, BrazilRio De Janeiro Fed Univ, Ocean Engn Program, COPPE, UFRJ, Rio De Janeiro, Brazil
Santos, Felipe M.
Carvalho, Luiz Mariano
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Rio De Janeiro State Univ UERJ, Rio De Janeiro, BrazilRio De Janeiro Fed Univ, Ocean Engn Program, COPPE, UFRJ, Rio De Janeiro, Brazil
Carvalho, Luiz Mariano
Santos, Andre L. C.
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Fed Ctr Technol Educ Rio De Janeiro CEFET RJ, Rio De Janeiro, BrazilRio De Janeiro Fed Univ, Ocean Engn Program, COPPE, UFRJ, Rio De Janeiro, Brazil
Santos, Andre L. C.
Costa, Leonardo P. F.
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Rio De Janeiro Fed Univ, Ocean Engn Program, COPPE, UFRJ, Rio De Janeiro, BrazilRio De Janeiro Fed Univ, Ocean Engn Program, COPPE, UFRJ, Rio De Janeiro, Brazil
Costa, Leonardo P. F.
Portilla-Yandun, Jesus
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Escuela Politec Nacl, Quito, EcuadorRio De Janeiro Fed Univ, Ocean Engn Program, COPPE, UFRJ, Rio De Janeiro, Brazil
Portilla-Yandun, Jesus
Romeiser, Roland
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机构:
Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, Coral Gables, FL USARio De Janeiro Fed Univ, Ocean Engn Program, COPPE, UFRJ, Rio De Janeiro, Brazil
机构:
Tokyo Inst Technol, Dept Built Environm, Midori Ku, Yokohama, Kanagawa 2268502, JapanTokyo Inst Technol, Dept Built Environm, Midori Ku, Yokohama, Kanagawa 2268502, Japan
Midorikawa, Saburoh
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机构:
Yamanaka, Hiroaki
Chimoto, Kosuke
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机构:
Tokyo Inst Technol, Dept Environm Sci & Technol, Midori Ku, Yokohama, Kanagawa 2268502, JapanTokyo Inst Technol, Dept Built Environm, Midori Ku, Yokohama, Kanagawa 2268502, Japan
Chimoto, Kosuke
Riddell, Rafael
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机构:
Univ Catolica Chile, Dept Struct & Geotech Engn, Santiago, ChileTokyo Inst Technol, Dept Built Environm, Midori Ku, Yokohama, Kanagawa 2268502, Japan
Riddell, Rafael
Miura, Hiroyuki
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机构:
Hiroshima Univ, Dept Architecture, Higashihiroshima 7398527, JapanTokyo Inst Technol, Dept Built Environm, Midori Ku, Yokohama, Kanagawa 2268502, Japan
Miura, Hiroyuki
Saguchi, Koichiro
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Tokyo Inst Technol, Dept Environm Sci & Technol, Midori Ku, Yokohama, Kanagawa 2268502, JapanTokyo Inst Technol, Dept Built Environm, Midori Ku, Yokohama, Kanagawa 2268502, Japan