Simulation of systematic site amplification effects observed at Heathcote Valley during the 2010-2011 Canterbury Earthquake sequence

摘要: The strong motion station at Heathcote Valley School (HVSC) recorded unusually high peak ground accelerations (2.21g vertical and 1.41g horizontal) during the February 2011 Christchurch earthquake. Ground motions HVSC in numerous other events also exhibited consistently higher intensities compared with nearby stations. We investigated underlying causes of such intensity by means 2D dynamic finite element analyses, using 2010-2011 Canterbury earthquake sequence. model takes advantage a LiDAR-based digital elevation (DEM) to account for surface topography, while geometry properties surficial soils are characterized seismic cone penetration tests (sCPT) Multi-Channel Analyses Surface Waves (MASW). Comparisons simulated suggests that our performs well distant events, near-field adopted reference Lyttelton Port not reasonable input simulation. simulations suggest Rayleigh waves generated inclined interface colluvium volcanic rock strongly affect HVSC, particular, being dominant contributor motions.