Frequency-dependent site amplifications with f ≥ 0.01 Hz evaluated from velocity and density models in Central Taiwan

Ming Wey Huang, Jeen Hwa Wang, Kuo Fong Ma, Chien Ying Wang, Jih Hao Hung, Kuo Liang Wen

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23 Scopus citations

Abstract

The frequency-dependent site amplifications at 87 free-field strongmotion station sites in central Taiwan are evaluated from the velocity and density structures constructed from borehole data measured at shallow depths and the velocity models inferred from earthquake data at great depths. Results based on the quarter-wavelength approximation method proposed by Boore and Joyner (1997) show that the site amplifications increase with frequency and are larger in the Western Plain with thick Holocene alluvium than in the Western Foothill with Pleistocene and Miocene formations. Considering wave attenuation, site amplification first increases and then decreases with increasing frequency. The turning frequency, ft, associated with the maximum amplification varies site by site.

Original languageEnglish
Pages (from-to)624-637
Number of pages14
JournalBulletin of the Seismological Society of America
Volume97
Issue number2
DOIs
StatePublished - Apr 2007

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