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Site Period Characteristics across the Canterbury Region of New Zealand
This paper summarizes the use of the horizontal-to-vertical spectral ratio method on ambient vibration records (H/V method) at over 100 sites across the Canterbury region of New Zealand to estimate the site period to basement rock and/or the period of the soil profile above shallower impedance contrasts. This method yielded site period estimates in the range of 5–7 seconds across much of the Canterbury Plains, with site periods decreasing rapidly in the vicinity of the Canterbury foothills and the Banks Peninsula outcrops around the edge of the basin. In Christchurch, up to three spectral peaks were clearly observed at some locations, with peaks corresponding to the impedance contrast at the top of the Riccarton Gravels, the top of the Miocene volcanics, and at basement depth. These periods of vibration above the shallower impedance contrasts are significant as they have a much shorter period than the period of the entire soil column down to basement rock. Further study is required to determine the influence of these shallower impedance contrasts on ground motion amplification and how to best account for these within site classification frameworks.
Site Period Characteristics across the Canterbury Region of New Zealand
This paper summarizes the use of the horizontal-to-vertical spectral ratio method on ambient vibration records (H/V method) at over 100 sites across the Canterbury region of New Zealand to estimate the site period to basement rock and/or the period of the soil profile above shallower impedance contrasts. This method yielded site period estimates in the range of 5–7 seconds across much of the Canterbury Plains, with site periods decreasing rapidly in the vicinity of the Canterbury foothills and the Banks Peninsula outcrops around the edge of the basin. In Christchurch, up to three spectral peaks were clearly observed at some locations, with peaks corresponding to the impedance contrast at the top of the Riccarton Gravels, the top of the Miocene volcanics, and at basement depth. These periods of vibration above the shallower impedance contrasts are significant as they have a much shorter period than the period of the entire soil column down to basement rock. Further study is required to determine the influence of these shallower impedance contrasts on ground motion amplification and how to best account for these within site classification frameworks.
Site Period Characteristics across the Canterbury Region of New Zealand
Wotherspoon, Liam M. (author) / Munro, James (author) / Bradley, Brendon A. (author) / Wood, Clinton (author) / Thomson, Ethan (author) / Deschenes, Michael (author) / Cox, Brady R. (author)
Geotechnical Earthquake Engineering and Soil Dynamics V ; 2018 ; Austin, Texas
2018-06-07
Conference paper
Electronic Resource
English
Site Period Characteristics across the Canterbury Region of New Zealand
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