7 Works

2021 New Zealand Ground-Motion Database

Jesse Hutchinson, Brendon A. Bradley, Robin Lee, Liam Wotherspoon, Mike Dupuis, Claudio Schill, Jason Motha, Anna E. Kaiser & Elena F. Manea
This report summarises the development of the 2021 New Zealand ground-motion database. Ground-motion intensity measures have been computed from strong-motion recordings for events with moment (and moment-equivalent) magnitudes equal to or greater than 4.0 from the year 2000 until the end of 2020. These measures include peak ground acceleration, peak ground velocity, cumulative absolute velocity, Arias intensity and pseudo-acceleration response spectra, among others. Along with these intensity measures, we have determined and/or collated earthquake rupture...

'Geologic Champagne' voyage report R/V Tangaroa TAN2006: 26 June - 17 July 2020, Wellington-Wellington

Ingo A. Pecher, Jess I. T. Hillman, Bryan W. Davy, A. R. Gorman, Suzi Woelz, D. Andrew, L. Boettger, A. Dalbeth, P. Gerring, J. Hoffman, A. Macnaughtan, P. Oluwunmi, W. Quinn, A. Shorrock & M. Tankersley
Tangaroa voyage TAN2006 took place from 26 June – 17 July 2020, with an unscheduled port call in Wellington from 29 June – 1 July due to equipment problems. The voyage objectives focused on geophysical studies of seafloor pockmarks on the Chatham Rise, as well as possible pockmarks and contourite deposits in the Bounty Trough. We acquired ~800 km of 2D seismic data, ~500 km of which were in a dense grid designed for high-resolution...

3D geological modelling of Wellington Quaternary sediments and basin geometry

Matt P. Hill, Anna E. Kaiser, L. M. Wotherspoon, Elena F. Manea, R. L. Lee, C. A. de la Torre & B. A. Bradley
This project has developed two new three-dimensional (3D) models of geological and geotechnical properties for Wellington: one regional-scale model from the Cook Strait north to Porirua; and the other city-scale model encompassing the Thorndon, Wellington central business district (CBD), Te Aro and Miramar areas. The models were created using the latest geomorphic and geological map interpretations, a borehole database and new geophysical investigations. The models interpret the accumulations of loose to dense Quaternary sediment deposited...

Combining observed linear basin amplification factors with 1D nonlinear site-response analyses to predict site response for strong ground motions: application to Wellington, New Zealand

Christopher de la Torre, Brendon A. Bradley, Felipe Kuncar, Robin L. Lee, Liam M. Wotherspoon & Anna E. Kaiser
This study develops a method for estimating site amplification that combines instrumentally observed site-specific amplification factors with modification factors from nonlinear site-response analyses. This approach provides estimates of site response for large-strain motions based on observations and sophisticated nonlinear modelling. A database of weak- to moderate-intensity ground motions recorded in three basins of Wellington, New Zealand, is used to study the observed site amplification. A subset of nine strong-motion stations was selected to perform nonlinear...

Te Tai-o-Rēhua – Silent Tsunami: voyage report R/V Tangaroa TAN2205, 17 March – 7 April 2022, Wellington–Wellington

Jess I. T. Hillman, S. J. Watson, Suzanne Bull, Malcolm J. Arnot, A. Pallentin, W. Quinn, E. Spain, Suzi Woelz, S. Coursey, G. Warren, F. Warnke & D. Krylova
This report documents the voyage objectives, outcomes and preliminary results of the GNS-Science-led R/V Tangaroa voyage TAN2205, which took place from 15 March to 7 April 2022 in the eastern Tasman Sea (Deepwater Taranaki Basin). The over-arching aim of the voyage was to acquire new information to help progress our understanding of the link between submarine landslides and tsunami in the Tasman Sea. The voyage is part of the 2021 Ministry of Business, Innovation &...

National Seismic Hazard Model : Site Characterisation Database summary report

L. M. Wotherspoon, Anna E. Kaiser, Elena F. Manea & A. C. Stolte
This report summarises the development of the 2022 Site Characterisation Database as part of the 2022 National Seismic Hazard Model (NSHM) update. The database provides a set of site characterisation parameters defined at past and present GeoNet seismic instrument locations. The datasets and methodology used to assign site parameter values are presented, including how these have evolved since the 2017 version of the database (Kaiser et al. 2017). The site database includes key site parameters...

2022 Revision of the National Seismic Hazard Model for New Zealand : overview of site/basin effects, including a case study of the Wellington Basin

Anna E. Kaiser, Elena F. Manea, L. M. Wotherspoon, Matt P. Hill, C. de la Torre, A. Stolte, Sanjay S. Bora, Brendon A. Bradley & Matt C. Gerstenberger
This report provides a high-level overview of the treatment of site/basin effects in New Zealand seismic hazard. We outline progress of the National Seismic Hazard Model (NSHM) working group on national site characterisation and a Wellington Basin case study. A key goal of the 2022 NSHM programme was an update of the site characterisation database (Wotherspoon et al. 2022), which provides a suite of site parameters for the full 870 national seismic network stations in...

Registration Year

  • 2022

Resource Types

  • Text


  • University of Auckland
  • GNS Science
  • University of Canterbury
  • National Institute of Water and Atmospheric Research
  • Victoria University of Wellington
  • University of Otago