Pure and Applied Geophysics

, Volume 176, Issue 11, pp 4861–4879 | Cite as

The High-Frequency Decay Parameter (Kappa) in Taiwan

  • Shun-Chiang Chang
  • Kuo-Liang WenEmail author
  • Ming-Wey Huang
  • Chun-Hsiang Kuo
  • Che-Min Lin
  • Chun-Te Chen
  • Jyun-Yan Huang


The high-frequency decay parameter kappa (κ) was computed by fitting Fourier amplitude spectra from the seismic network of the Taiwan Strong Motion Instrumentation Program (TSMIP). The κ of shear horizontal waves (SH waves) was calculated for individual recordings, and the relationship between κ values and the epicentral distance (Repi) of each station was derived for each station. The κ value at Repi = 0 (denoted as κ0) can be used as a site parameter. There are totally 26,277 seismograms that have been recorded at 679 TSMIP stations over the period of 1993 through 2014 with local magnitudes of 4.0–7.1 and focal depths less than 30 km. The estimation of κ0 for Taiwan ranges from 0.0208 to 0.147 s, and the spatial distribution of κ0 was closely related to geology and velocity. The site-specific κ0 values from 425 stations were correlated with the averaged shear wave velocity of the top 30 m of strata (VS30), and the relationship could be described as κ0 = (0.125 ± 0.005) − (0.011 ± 0.001) × ln(VS30), and an acceptable linear correlation (R2 = 0.57) was performed. The results may be used in the future application of ground motion prediction equations (GPMEs) and serve as simulation parameters. Also, the relationship between κ0 and the depth to engineering rock (Z1.0) is not well correlated, whereas an acceptable correlation exists between κ0 and other site proxies (i.e., elevation and resonant frequency).


Site effects decay parameters kappa VS30 Z1.0 



The authors would like to thank the Central Weather Bureau and the National Center for Research on Earthquake Engineering for providing the strong motion data. This work was funded by the Ministry of Science and Technology (MOST103-2625-M-008-017-MY3, MOST105-2116-M-008-012).


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Sinotech Engineering Consultant, LTDTaipeiTaiwan, ROC
  2. 2.Department of Earth SciencesNational Central UniversityChungliTaiwan, ROC
  3. 3.National Science and Technology Center for Disaster ReductionNew Taipei CityTaiwan, ROC
  4. 4.National Center for Research on Earthquake EngineeringTaipeiTaiwan, ROC
  5. 5.Institute of Earth SciencesAcademia SinicaTaipeiTaiwan, ROC

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