Development of realistic Vs profiles in Christchurch, New Zealand, via active and ambient surface wave data: Methodologies for inversion in complex inter-bedded geology (2015)
Type of ContentConference Contributions - Published
PublisherUniversity of Canterbury. Civil and Natural Resources Engineering
AuthorsTeague, D., Cox, B.R., Bradley, B.A., Wotherspoon, L.M.show all
Deep shear wave velocity (Vs) profiles (>400 m) were developed at 14 sites throughout Christchurch, New Zealand using surface wave methods. This paper focuses on the inversion of surface wave data collected at one of these sites, Hagley Park. This site is located on the deep soils of the Canterbury Plains, which consist of alluvial gravels inter-bedded with estuarine and marine sands, silts, clays and peats. Consequently, significant velocity contrasts exist at the interface between geologic formations. In order to develop realistic velocity models in this complex geologic environment, a-priori geotechnical and geologic data were used to identify the boundaries between geologic formations. This information aided in developing the layering for the inversion parameters. Moreover, empirical reference Vs profiles based on material type and confining pressure were used to develop realistic Vs ranges for each layer. Both the a-priori layering information and the reference Vs curves proved to be instrumental in generating realistic velocity models that account for the complex inter-bedded geology in the Canterbury Plains.
CitationTeague, D., Cox, B.R., Bradley, B.A., Wotherspoon, L.M. (2015) Development of realistic Vs profiles profiles in Christchurch, New Zealand, via active and ambient surface wave data: Methodologies for inversion in complex inter-bedded geology. Christchurch, New Zealand: 6th International Conference on Earthquake Geotechnical Engineering, 1-4 Nov 2015. 9.
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ANZSRC Fields of Research09 - Engineering::0905 - Civil Engineering::090501 - Civil Geotechnical Engineering
09 - Engineering::0905 - Civil Engineering::090504 - Earthquake Engineering