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Effect of frequency-dependent radiation pattern in the strong motion simulation of the 2011 Tohoku earthquake, Japan, using modified semi-empirical method

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Listed:
  • Sandeep
  • A. Joshi
  • Kamal
  • Parveen Kumar
  • Ashvini Kumar

Abstract

We perform a strong ground motion simulation using a modified semi-empirical technique (Midorikawa in Tectonophysics 218:287–295, 1993 ), with frequency-dependent radiation pattern model. Joshi et al. (Nat Hazards 71:587–609, 2014 ) have modified the semi-empirical technique to incorporate the modeling of strong motion generation areas (SMGAs). A frequency-dependent radiation pattern model is applied to simulate high-frequency ground motion more precisely. Identified SMGAs (Kurahashi and Irikura in Earth Planets Space 63:571–576, 2011 ) of the 2011 off the Pacific coast of Tohoku earthquake (M w = 9.0) were modeled using this modified technique. We analyzed the effect of changing seismic moment values of SMGAs on the simulated acceleration time series. Final selection of the moment values of SMGAs is based on the root-mean-square error (RMSE) of waveform comparison. Records are simulated for both frequency-dependent and constant radiation pattern function. Simulated records for both cases are compared with observed records in terms of peak ground acceleration, peak ground velocity and pseudo-acceleration response spectra at different stations. Comparison of simulated and observed records in terms of RMSE suggests that the method is capable of simulating record, which matches in a wide frequency range for this earthquake and bears realistic appearance in terms of shape and strong motion parameters. The results confirm the efficacy and suitability of rupture model defined by five SMGAs for the developed modified technique. Copyright Springer Science+Business Media Dordrecht 2014

Suggested Citation

  • Sandeep & A. Joshi & Kamal & Parveen Kumar & Ashvini Kumar, 2014. "Effect of frequency-dependent radiation pattern in the strong motion simulation of the 2011 Tohoku earthquake, Japan, using modified semi-empirical method," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 73(3), pages 1499-1521, September.
    • Handle: RePEc:spr:nathaz:v:73:y:2014:i:3:p:1499-1521
    DOI: 10.1007/s11069-014-1153-0
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    1. A. Joshi & Sandeep & Kamal, 2014. "Modeling of strong motion generation areas of the 2011 Tohoku, Japan earthquake using modified semi-empirical technique," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 71(1), pages 587-609, March.
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    Cited by:

    1. Sandeep & A. Joshi & Kamal & Parveen Kumar & Pushpa Kumari, 2014. "Modeling of strong motion generation area of the Uttarkashi earthquake using modified semiempirical approach," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 73(3), pages 2041-2066, September.

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