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Record-based validations of site-specific probabilistic seismic hazard assessment
Abstract Among the different approaches available to account for site specific ground response in a probabilistic seismic hazard analysis, PSHA, we have explored, with the support of instrumental data, a fully probabilistic method. In it, a probabilistic spectral site amplification function is convolved with a PSHA estimate of a spectral ordinate on rock, to obtain the corresponding spectral ordinate at the site surface. Relying on the abundant records available from the Japanese Kik-net, both at surface and downhole locations, we focused on two stations (NIGH11 and KMMH16), and derived estimations of annual mean rates of exceedance at the surface level, starting from both recorded and simulated accelerations. The simulated surface ground motions were obtained from one-dimensional, linear and non-linear wave propagation analyses, with randomized variabilities on soil stratigraphy. Two methods have been revised and checked for the computation of the convolution integral between the PSHA estimate on rock and a measure of soil amplification.
Highlights Two methods have been revised and checked for the computation of PSHA on soil, using Kik-net records. 1D linear visco-elastic and non-linear calculations are used for simulations, with variability in input and soil profile. Estimated site-specific hazard curves critically depend on the quality of the soil profile model available.
Record-based validations of site-specific probabilistic seismic hazard assessment
Abstract Among the different approaches available to account for site specific ground response in a probabilistic seismic hazard analysis, PSHA, we have explored, with the support of instrumental data, a fully probabilistic method. In it, a probabilistic spectral site amplification function is convolved with a PSHA estimate of a spectral ordinate on rock, to obtain the corresponding spectral ordinate at the site surface. Relying on the abundant records available from the Japanese Kik-net, both at surface and downhole locations, we focused on two stations (NIGH11 and KMMH16), and derived estimations of annual mean rates of exceedance at the surface level, starting from both recorded and simulated accelerations. The simulated surface ground motions were obtained from one-dimensional, linear and non-linear wave propagation analyses, with randomized variabilities on soil stratigraphy. Two methods have been revised and checked for the computation of the convolution integral between the PSHA estimate on rock and a measure of soil amplification.
Highlights Two methods have been revised and checked for the computation of PSHA on soil, using Kik-net records. 1D linear visco-elastic and non-linear calculations are used for simulations, with variability in input and soil profile. Estimated site-specific hazard curves critically depend on the quality of the soil profile model available.
Record-based validations of site-specific probabilistic seismic hazard assessment
Faccioli, E. (author) / Vanini, M. (author) / Paolucci, R. (author)
2018-02-27
Article (Journal)
Electronic Resource
English
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