Sensitivity of one-dimensional seismic ground response analyses of marine land reclamation profiles to the consideration of earthquake causal rupture parameters in selection of input ground motions

Abstract

One-dimensional seismic ground response analysis is typically performed to assess the nonlinear dynamic behavior of soils in the design of marine land reclamations in high seismicity regions. These analyses require a selection of input ground mo tions, for which seismic design codes generally recommend having seismic-hazard-consistent earthquake causal rupture parameters, such as rupture mechanism, magnitude, and source-to-site distance. This study investigated the impact of including earthquake causal rupture parameters in input ground motion selection criteria on the results of one-dimensional seismic ground response analysis of marine land reclamation profiles. Multiple one-dimensional seismic ground response analyses were performed to cover a range of marine land reclamation soil conditions and response spectral amplitudes. Candidate ground motion catalogues were developed considering hazard-consistent secondary intensity measures, with and without bounds placed on earthquake causal rupture parameters. Sets of ground motions were selected from these catalogues based on their fit with the respective target response spectrum. Input-tosurface amplification factors were calculated for the various input ground motions and marine land reclamation profiles. The results of the analyses were compared to assess the differences in amplification factors calculated with input motions selected using the different approaches for considering earthquake causal rupture parameters