Strong ground motions simulations for Dunedin city, New Zealand: First steps using the SCEC Broadband Simulation Platform

Mark W. Stirling

Submitted August 8, 2018, SCEC Contribution #8346, 2018 SCEC Annual Meeting Poster #009

Our poster will present on-going QuakeCoRE-funded work (quakecore.nz) on developing strong motion simulations for the greater Dunedin city area. The city has never experienced strong ground motions in the entire 179 year historical record, and has an aging built environment. Source modelling and ground motion simulations are being carried out for the city center using the SCEC Broadband Simulation Platform (SCEC BBSP). The BBSP computes broadband (0-10 Hz) seismograms from modeled earthquake sources. The Akatore Fault, the most active fault in Otago and closest major fault to Dunedin, is focused on in the present study. Simulations for various Akatore Fault source scenarios will be presented in the poster.

Path and site effects are key components considered in the simulation process. A 1D shear wave velocity profile is required by the SCEC BBSP to represent the Akatore-to-CBD path and site, and we have chosen the BBSP’s Mojave profile for representing Dunedin conditions. The choice was based on comparison of the available BBSP 1D profiles to our profile developed from seismic reflection lines acquired in the city in 2017-8. A 3D shear wave velocity model is currently under development for Dunedin, and this will be applied to future ground motion simulations for the city.

Key Words
Ground, motion, simulations, BBSP, Dunedin, New Zealand, seismic, hazard

Citation
Stirling, M. W. (2018, 08). Strong ground motions simulations for Dunedin city, New Zealand: First steps using the SCEC Broadband Simulation Platform. Poster Presentation at 2018 SCEC Annual Meeting.


Related Projects & Working Groups
Ground Motions