Wellington basin amplification: research goals and update from the NSHM programme (2021)
In Wellington, 3D basin amplification effects observed at 1 – 2 second spectral periods were identified as one factor likely to have exacerbated damage to mid-rise structures during the 2016 Mw 7.8 Kaikōura earthquake (Bradley et al. 2018; MBIE, 2017). These local basin-specific ground-motion effects are not typically fully captured in traditional seismic hazard models. A component of the newly launched National Seismic Hazard Model (NSHM) programme aims to quantify spatial patterns and event-to-event variability of ground-motion amplification effects in central Wellington. This project will investigate the advances provided by both new empirical ground motion models available since the previous NSHM (Stirling et al. 2012) and also by physics-based ground motion simulation methods. The geometry and sediment fill of the Wellington basin under Wellington’s CBD is relatively wellcharacterised (Kaiser et al. 2019; 2020), allowing a detailed case study to be undertaken. We will ultimately provide a summary of the state-of-knowledge of Wellington basin amplification effects and an initial roadmap towards capturing these effects in seismic hazard nationwide. Here we present an introduction to the NSHM Wellington basin project and its goals. We also outline first steps focused on the compilation of a new central Wellington Vs30 map, a regional basin velocity model and a Hikurangi earthquake ground-motion simulation framework.
CitationKaiser A, Hill M, Bourguignon S, Gerstenberger M, Bradley B, Lee R, Wotherspoon L, Pancha A, Roten D (2021). Wellington basin amplification: research goals and update from the NSHM programme. Christchurch, New Zealand: New Zealand Society for Earthquake Engineering Annual Conference. 14/04/2021-16/04/2021.
This citation is automatically generated and may be unreliable. Use as a guide only.
ANZSRC Fields of Research40 - Engineering::4005 - Civil engineering::400506 - Earthquake engineering
37 - Earth sciences::3706 - Geophysics::370609 - Seismology and seismic exploration
37 - Earth sciences::3709 - Physical geography and environmental geoscience::370903 - Natural hazards
37 - Earth sciences::3704 - Geoinformatics::370401 - Computational modelling and simulation in earth sciences
RightsAll rights reserved unless otherwise stated
Showing items related by title, author, creator and subject.
Bellagamba X; Bradley, Brendon (2019)
Simulation of systematic site amplification effects observed at Heathcote Valley during the 2010-2011 Canterbury Earthquake sequence Jeong, S.; Bradley, Brendon (University of Canterbury. Civil and Natural Resources Engineering, 2015)he 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 recorded ...