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Frequency-Dependent Site Amplifications with f 0.01 Hz Evaluated from Velocity and Density Models in Central Taiwan

¹ Graduate Institute of Geophysics
National Central University
Jung-Li, Taiwan 320
 (M.-W.H., K.-F.M., C.-Y.W., J.-H.H., K.-L.W.)

² Institute of Earth Sciences, Academia Sinica
P.O. Box 1-55
Nangang, Taipei, Taiwan 115
 (M.-W.H., J.-H.W)

³ National Center for Research on Earthquake Engineering
Taipei, Taiwan 106
 (K.-L.W.)

The frequency-dependent site amplifications at 87 free-field strong- motion 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, f_t, associated with the maximum amplification varies site by site.