HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Full Text (PDF) Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (11) Citing Articles via Google Scholar Google Scholar Articles by Satoh, T. Articles by Tatsumi, Y. Search for Related Content GeoRef GeoRef Citation

Inversion of Strain-Dependent Nonlinear Characteristics of Soils Using Weak and Strong Motions Observed by Borehole Sites in Japan

Ohsaki Research Institute
2-2-2, Uchisaiwai-cho, Chiyoda-ku
Tokyo 100-0011, Japan
(T.S.)

Kansai Electric Power Company
3-2-22, Nakanoshima, Kita-ku
Osaka 530-8270, Japan
(M.F., Y.T.)

During the 1995 Hyogo-ken Nanbu earthquake, strong motions with horizontal peak ground accelerations of 507 cm/sec² or more, 187 cm/sec², and 126 cm/sec² were observed at surface stations of borehole sites at Amagasaki, Takasago, and Nanko in Japan, respectively. We showed qualitative evidence of nonlinear soil response during strong motions at Amgasaki and Takasago, but not at Nanko, using cross correlation and spectral ratio analyses of weak and strong motions. We evaluated soil nonlinearity by inversion for S-wave velocities and frequency-dependent damping factors. The strain-dependence of shear modulus ratios inverted for gravel is larger than that for clay, which is consistent with laboratory test results. In the shear-strain range from about 10^–4 to 10^–3, the strain dependence of shear modulus ratios inverted for clay and gravel at Amagasaki and Takasago is consistent with empirical relations based on laboratory test results for clay and gravel, respectively. These results support using laboratory estimates of shear modulus ratios to simulate strong motions at clay and gravel sites. The damping factors for gravel inverted from the mainshock at Amagasaki are the largest among the others, but the strain dependence of damping factors are not as significant as that of shear modulus ratios. The reason why the strain dependence of damping factors is not so significant may be because scattering attenuation is relatively dominated in the low-strain range.

This article has been cited by other articles:

				D. Assimaki, W. Li, J. H. Steidl, and K. Tsuda Site Amplification and Attenuation via Downhole Array Seismogram Inversion: A Comparative Study of the 2003 Miyagi-Oki Aftershock Sequence Bulletin of the Seismological Society of America, February 1, 2008; 98(1): 301 - 330. [Abstract] [Full Text] [PDF]

				P. Lovely, J. H. Shaw, Q. Liu, and J. Tromp A Structural VP Model of the Salton Trough, California, and Its Implications for Seismic Hazard Bulletin of the Seismological Society of America, October 1, 2006; 96(5): 1882 - 1896. [Abstract] [Full Text] [PDF]

				K. Tsuda, J. Steidl, R. Archuleta, and D. Assimaki Site-Response Estimation for the 2003 Miyagi-Oki Earthquake Sequence Considering Nonlinear Site Response Bulletin of the Seismological Society of America, August 1, 2006; 96(4A): 1474 - 1482. [Abstract] [Full Text] [PDF]

				T. Satoh Inversion of QS of Deep Sediments from Surface-to-Borehole Spectral Ratios Considering Obliquely Incident SH and SV Waves Bulletin of the Seismological Society of America, June 1, 2006; 96(3): 943 - 956. [Abstract] [Full Text] [PDF]

				D. Komatitsch, Q. Liu, J. Tromp, P. Suss, C. Stidham, and J. H. Shaw Simulations of Ground Motion in the Los Angeles Basin Based upon the Spectral-Element Method Bulletin of the Seismological Society of America, February 1, 2004; 94(1): 187 - 206. [Abstract] [Full Text] [PDF]

				Borehole Response Studies at the Garner Valley Downhole Array, Southern California Bulletin of the Seismological Society of America, December 1, 2002; 92(8): 3165 - 3179.