Seismic Amplification by Deep Subsurface and Proposal of a New Proxy
Codes of practice and ground motion prediction equations involve ground structure proxies to account for seismic amplification. Although the ground consists of both shallow and deep subsurface, proxies are mainly related to the shallow subsurface as it is shallow subsurface information that is mostly available. However, as deep subsurface seismic amplification is not negligible, it may not be appropriate to use shallow subsurface proxies. In this study, the relationship between shallow and deep subsurface seismic amplification factors is discussed on the basis of S-wave velocity profile data from Japanese KiK-net strong-motion observation system stations. The correlation between typical proxies such as the average S-wave velocity of the top 30m of the ground surface and the seismic amplification factor was examined. Although there was a negative correlation between the two, the degree of the correlation was weak. A new proxy showing stronger correlations with the seismic amplification factor is proposed and its effectiveness is demonstrated.
Keywords:seismic amplification, Vs30, S-wave velocity, deep subsurface
H. B. Seed, C. Ugas, J. Lysmer, “Site-dependent spectra for earthquake-resistant design”, Bulletin of the Seismological Society of America. Vol. 66, No. 1, pp. 221-243, 1976
R. D. Borcherdt, “Estimates of site-dependent response spectra for design (methodology and justification)”, Earthquake Spectra, Vol. 10, No. 4, pp. 617–653, 1994 DOI: https://doi.org/10.1193/1.1585791
R. Dobry, R. D. Borcherdt, C. B. Crouse, I. M. Idriss, W. B. Joyner, G. Martin, M. S. Power, E. E. Rinne, R. B. Seed, “New site coefficients and site classification system used in recent building seismic code provisions”, Earthqake Spectra, Vol. 16, No. 1, pp. 41–67, 2000 DOI: https://doi.org/10.1193/1.1586082
S. Castellaro, F. Mulargia, P. L. Rossi, “VS30: Proxy for seismic amplification?”, Seismological Research Letters, Vol. 79, No. 4, pp. 540–543, 2008 DOI: https://doi.org/10.1785/gssrl.79.4.540
V. W. Lee, M. D. Trifunac, “Should average shear-wave velocity in the top 30m of soil be used to describe seismic amplification?”, Soil Dynamics and Earthquake Engineering, Vol. 30, No. 11, pp. 1250–1258, 2010 DOI: https://doi.org/10.1016/j.soildyn.2010.05.007
Building Seismic Safety Council, NEHRP recommended provisions for seismic regulations for new buildings and other structures, Part 1: Provisions (FEMA 368), Federal Emergency Management Agency, 2001
AASHTO (American Association of State Highway and Transportation Officials), Guide specifications for LRFD seismic bridge design, Second edition with 2014 interim, AASHTO, 2014
CEN, Eurocode8. Design of structures for earthquake resistance. Part1: general rules, seismic actions and rules for buildings. Final draft pr EN1998, European Committee for Standardization, CEN, 2003
Building Seismic Safety Council, Recommended provisions for seismic regulations for new buildings and other structures, part 1: Provisions. report No. FEMA-450, FEMA, 2003
American Society of Civil Engineers (ASCE), Minimum design loads for buildings and other structures, tandards ASCE/SEI 7-10, 2010
J. X. Zhao, J. Zhang, A. Asano, Y. Ohno, T. Oouchi, T. Takahashi, H. Ogawa, K. Irikura, H. K. Thio, P. G. Somerville, Y. Fukushima, Y. Fukushima, “Attenuation relations of strong ground motion in Japan using site classification based on predominant period”, Bulletin of the Seismological Society of America, Vol. 96, No. 3, pp. 898–913, 2006 DOI: https://doi.org/10.1785/0120050122
T. Kanno, A. Narita, N. Morikawa, H. Fujiwara, Y. Fukushima, “A new attenuation relation for strong ground motion in Japan based on recorded data”, Bulletin of the Seismological Society of America, Vol. 96, No. 3, pp. 879–897, 2006 DOI: https://doi.org/10.1785/0120050138
Japan Road Association, Specifications for highway bridges, part5, Seismic design, ver. 2012, Maruzen Co., Ltd., 2016
T. Narafu, Y. Ishiyama, R. Ison, J. Sakuma, H. Kato, S. Kita, “Outline and features of Japanese seismic design code”, 16th World Conference on Earthquake Engineering, Santiago Chile, January 9-13, 2017
D. M. Boore, W B. Joyner, “Site amplifications for generic rock sites”, Bulletin of the Seismological Society of America, Vol. 87, No. 2, pp. 327-341, 1997
Y. Fukushima, T. Nagao, “Variation of earthquake ground motions with focus on site amplification factors: a case study”, Engineering, Technology & Applied Science Research Vol. 9, No. 4, pp. 4355-4360, 2019 DOI: https://doi.org/10.48084/etasr.2856
S. Aoi, K. Obara, S. Hori, K. Kasahara, Y. Okada, “New strong-motion observation network: KiK-net”, Eos, Transactions of the American Geophysical Union, Vol. 81, 2000
H. Fujiwara, S. Kawai, K. X. S. Hao, N. Morikawa, H. Azuma, “J-SHIS: An integrated system for sharing information on national seismic hazard maps for Japan”, 16th World Conference on Earthquake Engineering, Santiago Chile, January 9-13, 2017
Y. Okada, K. Kasahara, S. Hori, K. Obara, S. Sekiguchi, H. Fujiwara, A. Yamamoto, “Recent progress of seismic observation networks in Japan-Hi-net, F-net, K-NET and KiK-net”, Earth Planets and Space, Vol. 56, No. 8, pp. 15-28, 2004 DOI: https://doi.org/10.1186/BF03353076
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