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Finite-fault stochastic simulation of the 2008 Iwate-Miyagi Nairiku, Japan, earthquake

Author

Listed:
  • Jafar Karashi

    (Azarbaijan Shahid Madani University)

  • Meghdad Samaei

    (Mahallat Institute of Higher Education)

  • Masakatsu Miyajima

    (Kanazawa University)

Abstract

The finite-fault stochastic method was applied to simulate the Mw 6.9, 2008 Iwate-Miyagi earthquake at 44 selected KiK-net sites using EXSIM computer code. To investigate the effects of source characteristics on the simulated results, three models were considered: two models with prescribed slip distribution (Model 1 and Model 3) and a model with random slip distribution (Model 2). S-wave regional attenuation indicates an obvious difference between fore-arc and back-arc regions which are formed by volcanic front. Site amplification was determined by corrected surface to borehole spectral ratio and Quarter wavelength methods. The high-frequency decay parameter (kappa) was estimated to be 0.0473 s. The value of 16 MPa for stress drop was calculated by minimizing the absolute residual of 5% damped pseudo-spectral accelerations (PSA). Comparison of the observed and simulated PGAs and PSAs was performed to investigate the capability of our finite-fault models. The residual models represent that the simulated results by Model 2 are in good agreement with the observations in f

Suggested Citation

  • Jafar Karashi & Meghdad Samaei & Masakatsu Miyajima, 2022. "Finite-fault stochastic simulation of the 2008 Iwate-Miyagi Nairiku, Japan, earthquake," 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. 114(2), pages 1985-2012, November.
    • Handle: RePEc:spr:nathaz:v:114:y:2022:i:2:d:10.1007_s11069-022-05456-y
    DOI: 10.1007/s11069-022-05456-y
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