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

Jafar Karashi (), Meghdad Samaei and Masakatsu Miyajima
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Jafar Karashi: Azarbaijan Shahid Madani University
Meghdad Samaei: Mahallat Institute of Higher Education
Masakatsu Miyajima: Kanazawa University

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2022, vol. 114, issue 2, No 37, 1985-2012

Abstract: 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

Keywords: Iwate-Miyagi earthquake; Strong motion simulation; Stochastic simulation; EXSIM; Finite fault (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s11069-022-05456-y

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