Taiwan-Specific Model for VS30 Prediction Considering Between-Proxy Correlations
- Authors
- Kwok, On Lei Annie; Stewart, Jonathan P.; Kwak, Dong Youp; Sun, Pang-Li
- Issue Date
- Nov-2018
- Publisher
- Earthquake Engineering Research Institute
- Citation
- Earthquake Spectra, v.34, no.4, pp.1973 - 1993
- Indexed
- SCIE
SCOPUS
- Journal Title
- Earthquake Spectra
- Volume
- 34
- Number
- 4
- Start Page
- 1973
- End Page
- 1993
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/5188
- DOI
- 10.1193/061217EQS113M
- ISSN
- 8755-2930
- Abstract
- Ergodic site response models are generally conditional on the time-averaged shear wave velocity in the upper 30 m (V-S30). Ground motion databases contain many recordings from Taiwan, and because of site characterization efforts, 56% of recording sites have V-S30 derived from measurements. We develop proxy-based V-S30 prediction models, one application of which is for the remaining 44% of Taiwan sites. Our approach, which can be suitable for other regions, differs from previous studies in which proxies are based on detailed geologic categories and possible within-category topographic gradient effects. Instead, we use three broad, age-based geologic categories, and for the youngest category of Holocene and Quaternary undivided sediments, we propose models conditioned on gradient and elevation. We also adapt a geomorphic terrain-based method, thus providing two V-S30-predictionmodels. We describe a model weighting scheme that combines the models in consideration of their relative dispersions and correlation, producing a weighted mean and standard deviation natural-log V-S30. Included as an electronic supplement is a profile database file and a site database with site parameters for Taiwan ground motion stations.
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