1-D and 2-D analyses of weak motion data in Fraser Delta from 1966 Duvall earthquake |
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| Authors: | W D Liam Finn E Zhai T Thavaraj X -S Hao C E Ventura |
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| Institution: | a Department of Safety Systems Construction Engineering, Anabuki Chair of Foundation Geodynamics, Kagawa University, 1-1 Saiwai-cho, 22117 Hayashi-cho, Kagawa, Takamatsu 761-0396, Japan;b Department of Civil Engineering, University of British Columbia, 2324 Main Mall, Vancouver, BC, Canada V6T 1Z4 |
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| Abstract: | The 1996 Duvall earthquake in Washington State triggered ground motion stations in the Fraser Delta, British Columbia, located on varying depths of Holocene and Pleistocene soils to a maximum depth of 800 m and one station on bedrock. Recorded ground motions were used to examine the applicability of 1-D and 2-D site response analyses for amplification studies in the Delta. 1-D response analysis gave a good indication of the period of peak response. Response spectra computed by 1-D analysis did not compare well with recorded spectra except at very deep sites. The use of 2-D analyses to include buried topography generally improved the predictions of site response spectra at the shallow sites. However, for the shallow earth sites, the recorded motions showed a strong spectral response at short periods in the range of 0.1–0.25 s. Neither 1-D nor 2-D analysis predicted this response. |
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| Keywords: | Duvall earthquake Holocene Pleistocene |
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