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Natural Hazards

, Volume 87, Issue 1, pp 57–81 | Cite as

Hybrid broadband simulation of strong-motion records from the September 16, 1978, Tabas, Iran, earthquake (M w 7.4)

  • H. VahidifardEmail author
  • H. Zafarani
  • S. R. Sabbagh-Yazdi
Original Paper
  • 131 Downloads

Abstract

This paper presents a simulation of three components of near-field ground shaking recorded during the main shock at three stations of the September 16, 1978, Tabas (M w = 7.4), Iran, earthquake, close to the causative fault. A hybrid method composed of a discrete wavenumber method developed by Bouchon (Bouchon in Bull Seismol Soc Am 71:959–971, 1981; Cotton and Coutant in Geophys J Int 128:676–688, 1997) and a stochastic finite-fault modeling based on a dynamic corner frequency proposed by Motazedian and Atkinson (Bull Seismol Soc Am 95:995–1010, 2005), modified by Assatourians and Atkinson (Bull Seismol Soc Am 97:935–1949, 2007), is used for generating the seismograms at low (0.1–1.0 Hz) and high frequencies (1.0–20.0 Hz), respectively. The results are validated by comparing the simulated peak acceleration, peak velocity, peak displacement, Arias intensity, the integral of velocity squared, Fourier spectrum and acceleration response spectrum on a frequency-by-frequency basis, the shape of the normalized integrals of acceleration and velocity squared, and the cross-correlation with the observed time-series data. Each characteristic is compared on a scale from 0 to 10, with 10 being perfect agreement. Also, the results are validated by comparing the simulated ground motions with the modified Mercalli intensity observations reported by reconnaissance teams and showed reasonable agreement. The results of the present study imply that the damage distribution pattern of the 1978 Tabas earthquake can be explained by the source directivity effect.

Keywords

Hybrid broadband simulation Near field Tabas earthquake MMI observation Discrete wavenumber method Stochastic modeling technique 

Notes

Acknowledgements

The generosity of Karen Assatourians and Gail Atkinson for providing us with the source code of the EXSIM12 program is gratefully acknowledged. Our sincere thanks go to Olivier Coutant for providing us with the AXITRA package to calculate near-source seismograms with the discrete wavenumber method. The authors acknowledge the Building and Housing Research Centre of Iran for providing them with the accelerograms and shear-wave velocities used in the current study. H. Zafarani thanks the continuing support of the International Institute of Earthquake Engineering and Seismology in the framework of the Probabilities of Earthquake Ruptures in Iran (PERSIA) project.

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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  • H. Vahidifard
    • 1
    Email author
  • H. Zafarani
    • 2
  • S. R. Sabbagh-Yazdi
    • 1
  1. 1.K. N. Toosi University of TechnologyTehranIran
  2. 2.International Institute of Earthquake Engineering and Seismology (IIEES)TehranIran

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