Incorporating near-surface attenuation in empirical ground motion models

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dc.contributor.advisor Larkin, T en
dc.contributor.advisor Holden, C en Van Houtte, Christopher en 2017-06-06T21:17:16Z en 2017 en
dc.identifier.uri en
dc.description.abstract This thesis addresses empirical ground motion modelling in the context of seismic hazard assessment. In particular, the work focuses on empirical modelling of high frequency ground motions at rock sites. The first section uses data from the Canterbury earthquake sequence to improve understanding of the physical mechanisms behind high frequency Fourier spectral amplitudes and develop robust methods of estimating the high frequency spectral decay parameter, K. The improved estimation method is then used to calculate the site attenuation parameter K0, at GeoNet rock sites across New Zealand. This analysis reveals strong variation in site attenuation between the high and low seismicity regions of New Zealand. Using the geostatistical technique of ordinary kriging, a continuous 0 map of New Zealand is developed. The second half of the thesis utilises the K0 map to derive an empirical model of the earthquake Fourier amplitude spectrum, using K0 as a site-specific predictor. The model is derived by fitting previously-recorded New Zealand ground motion data. It is found that using K0 as a predictor in the empirical model is largely unsuccessful, and the model performs better if K0 is excluded from the model. A model is instead derived without explicit specification of site attenuation effects. To complement the Fourier amplitude spectrum model, a model for the significant duration of ground motion is derived. These two models are used together in a random vibration theory analysis, to predict response spectra. In deriving the duration model, conceptual improvements are made to random vibration theory calculations in the context of engineering seismology. It is shown that the subsequent empirical model of response spectra is generally unbiased with respect to New Zealand response spectral data, for damping levels of 5% and 20%. en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof PhD Thesis - University of Auckland en
dc.relation.isreferencedby UoA99264967613902091 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri en
dc.title Incorporating near-surface attenuation in empirical ground motion models en
dc.type Thesis en Civil Engineering en The University of Auckland en Doctoral en PhD en
dc.rights.holder Copyright: The author en
dc.rights.accessrights en
pubs.elements-id 628625 en
pubs.record-created-at-source-date 2017-06-07 en

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