https://bull.nzsee.org.nz/index.php/bnzsee/issue/feed Bulletin of the New Zealand Society for Earthquake Engineering 2019-12-31T00:00:00+13:00 Rajesh Dhakal rajesh.dhakal@canterbury.ac.nz Open Journal Systems <p>Bulletin of the New Zealand Society for Earthquake Engineering</p> https://bull.nzsee.org.nz/index.php/bnzsee/article/view/458 Ground motion simulations of Hope fault earthquakes 2019-12-04T02:10:24+13:00 Ethan M. Thomson ethan.thomson@pg.canterbury.ac.nz Robin L. Lee robin.lee@canterbury.ac.nz Brendon A. Bradley brendon.bradley@canterbury.ac.nz <p>This paper examines ground motions for a major potential Mw7.51 rupture of the Hope Fault using a physics based simulation methodology and a 3D crustal velocity model of New Zealand. The simulation methodology was validated for use in the region through comparison with observations for a suite of historic small magnitude earthquakes located proximal to the Hope Fault. Simulations are compared with conventionally utilised empirical ground motion models, with simulated peak ground velocities being notably higher in regions with modelled sedimentary basins. A sensitivity analysis was undertaken where the source characteristics of magnitude, stress parameter, hypocentre location and kinematic slip distribution were varied and an analysis of their effect on ground motion intensities is presented. It was found that the magnitude and stress parameter strongly influenced long and short period ground motion amplitudes, respectively. Ground motion intensities for the Hope Fault scenario are compared with the 2016 Kaik¯oura Mw7.8 earthquake, it was found that the Kaikoura earthquake produced stronger motions along the eastern South Island, while the Hope Fault scenario resulted in stronger motions immediately West of the near-fault region and similar levels of ground motion in Canterbury. The simulated ground motions for this scenario complement prior empirically-based estimates and are informative for mitigation and emergency planning purposes.</p> 2019-12-01T00:00:00+13:00 Copyright (c) https://bull.nzsee.org.nz/index.php/bnzsee/article/view/459 A detailed inventory of medium to high-rise buildings in Wellington's central business district 2019-12-04T02:10:25+13:00 Aishwarya Puranam ashpuranam@gmail.com Olga Filippova o.filippova@auckland.ac.nz Jacob Pastor-Paz jacob.pastorpaz@vuw.ac.nz Max Stephens max.stephens@auckland.ac.nz Kenneth J. Elwood k.elwood@auckland.ac.nz Najif Ismail najif.ismail@weltec.ac.nz Ilan Noy ilan.noy@vuw.ac.nz Eyitayo Opabula eopa589@aucklanduni.ac.nz <p>Recent earthquakes in New Zealand not only highlighted the vulnerabilities of the existing building stock but also the need for: (i) a better understanding of the building inventory, and (ii) easy access to information for quicker response after an event. In the case of Wellington, efforts over the years by the City Council and other stakeholders have produced a number of useful datasets about the building inventory. These available datasets when put together are critical in understanding the composition and characteristics of the building inventory in Wellington. This paper describes the available information, and the process to combine the different strands of data possessed by multiple stakeholders into an effective and usable multi-disciplinary building inventory database for Wellington’s CBD. The uses and future directions for this collated database are also discussed.</p> 2019-12-01T00:00:00+13:00 Copyright (c) https://bull.nzsee.org.nz/index.php/bnzsee/article/view/460 Ground motion models for Arias intensity, cumulative absolute velocity, peak incremental ground velocity, and significant duration in New Zealand 2019-12-04T02:10:27+13:00 Zach Bullock zachary.bullock@colorado.edu <p>This study proposes empirical ground motion models for a variety of non-spectral intensity measures and significant durations in New Zealand. Equations are presented for the prediction of the median and maximum rotated components of Arias intensity, cumulative absolute velocity, cumulative absolute velocity above a 5 cm/s<sup>2</sup> acceleration threshold, peak incremental ground velocity, and the 5% to 75% and 5% to 95% significant durations. Recent research has highlighted the usefulness of these parameters in both structural and geotechnical engineering. The New Zealand Strong Motion Database provides the database for regression and includes many earthquakes from all regions of New Zealand with the exceptions of Auckland and Northland, Otago and Southland, and Taranaki. The functional forms for the proposed models are selected using cross validation. The possible influence of effects not typically included in ground motion models for these intensity measures is considered, such as hanging wall effects and basin depth effects, as well as altered attenuation in the Taupo Volcanic Zone. The selected functional forms include magnitude and rupture depth scaling, attenuation with distance, and shallow site effects. Finally, the spatial autocorrelation of the models’ within-event residuals is considered and recommendations are made for developing correlated maps of intensity predictions stochastically.</p> 2019-12-01T00:00:00+13:00 Copyright (c)