Abstract
Background This study examines the performance of site response analysis via nonlinear total-stress 1D wave-propagation for modelling site effects in physics-based ground motion simulations of the 2010-2011 Canterbury, New Zealand earthquake sequence. This approach allows for explicit modeling of 3D ground motion phenomena at the regional scale, as well as detailed nonlinear site effects at the local scale. The approach is compared to a more commonly used empirical VS30 (30 m time-averaged shear wave velocity)-based method for computing site amplification as proposed by Graves and Pitarka (2010, 2015), and to empirical ground motion prediction via a ground motion model (GMM).
Highlights
This study examines the performance of site response analysis via nonlinear total-stress 1D wave-propagation for modelling site effects in physics-based ground motion simulations of the 2010-2011 Canterbury, New Zealand earthquake sequence
Empirical VS30-Based Method: Figure 1a shows period-dependent nonlinear site amplification factors from the empirical ground motion model (GMM) by Campbell and Bozorgnia (2014). This function is truncated, as recommended by Graves and Pitarka (2010), for two different reasons: 1) long periods are truncated because the 3D long period component of the simulation should account for deep site response which would influence very long periods, and 2) short periods are truncated because this amplification function is meant to be applied to response spectra, but in this context it is applied to Fourier spectra in the frequency domain
Physics-Based Wave Propagation Analysis: Figure 1b illustrates physics-based site response via wave propagation, in which simulated ground motions are extracted from the 3D model, deconvolved, and used as input to a nonlinear 1D site response analysis in OpenSees
Summary
This study examines the performance of site response analysis via nonlinear total-stress 1D wave-propagation for modelling site effects in physics-based ground motion simulations of the 2010-2011 Canterbury, New Zealand earthquake sequence. This approach allows for explicit modeling of 3D ground motion phenomena at the regional scale, as well as detailed nonlinear site effects at the local scale. The approach is compared to a more commonly used empirical VS30 (30 m time-averaged shear wave velocity)-based method for computing site amplification as proposed by Graves and Pitarka (2010, 2015), and to empirical ground motion prediction via a ground motion model (GMM)
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