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Estimating inelastic sediment deformation from local site response simulations


Significant insight into the dynamic local site response of a horizontally layered sediment deposit to seismic excitation can be gained from numerical simulations. In this paper we use a nonlinear local site response analysis code SPECTRA to estimate the coseismic sediment deformation at a seismically active site in Lotung, Taiwan. We address some basic issues relevant for interpreting the simulation results, including the impact of noise and baseline offsets present in the input ground motion. We also consider the sensitivity of the predicted deformation responses to statistical variations of sediment constitutive properties. Finally, we apply a suite of hypothetical strong ground motions to the base of the sediment deposit to better understand the pattern of inelastic deformation likely to result from strong seismic shaking.

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We thank Dr. H.T. Tang and Electric Power Research Institute for providing the digitized ground motion data for the Lotung earthquakes. We also thank Dr. H. Haddadi for providing raw ground motion data for Gilroy 1, and Dr. C. Menun for allowing us to use the program CARDINAL. This research was funded by NSF Grant No. CMS-0201317.

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Correspondence to Ronaldo I. Borja.

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Borja, R.I., Sun, W.C. Estimating inelastic sediment deformation from local site response simulations. Acta Geotech. 2, 183 (2007).

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  • Coseismic sediment deformation
  • Local site response
  • Plasticity
  • Seismicity
  • Strong ground motion