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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/5921
Title: A simplified method for simulation of strong ground motion using finite rupture model of the earthquake source
Authors: Joshi A.
Midorikawa S.
Published in: Journal of Seismology
Abstract: We present a simplified method to simulate strong ground motion for a realistic representation of a finite earthquake source burried in a layered earth. This method is based on the stochastic simulation method of Boore (Boore, D. M., 1983, Bull. Seism. Soc. Am. 73, 1865-1894) and the Empiri cal Green's Function (EFG) method of Irikura (Irikura, K., 1986, Proceedings of the 7th Japan Earthquake symposium, pp. 151-156). The rupture responsible for an earthquake is represented by several subfaults. The geometry of subfaults and their number is decided by the similarity relationships. For simulation of ground motion using the stochastic simulation technique we used the shapping window based on the kinetic source model of the rupture plane. The shaping window deepens on the geometry of the earthquake source and the propagation characteristics of the energy released by various subfaults. The division of large fault into small subfaults and the method for accounting their contribution at the surface is identical to the EGF. The shapping window has been modified to take into account the effect of the transmission of energy released form the finite fault at various boundaries of the layered earth model above the source. In the present method we have applied the correction factor to adjust slip time function of small and large earthquakes. The correction factor is used to simulate strong motion records having basic spectral shape of ?2 source model in broad frequency range. To test this method we have used the strong motion data of the Geiyo earthquake of 24th March 2001, Japan recorded by KiK network. The source of this earthquake is modelled by a simple rectangular rupture of size 24 × 15 km, burried at a depth of 31 km in a multilayered earth model. This rupture plane is divided into 16 rectangular subfaults of size 6.0 × 3.75 km each. Strong motion records at eight selected near-field stations were simulated and compared with the observed records in terms of the acceleration and velocity records and their response spectrum. The comparison confirms the suitability of proposed rupture model responsible for this earthquake and the efficacy of the approach in predicting the strong motion scenario of earthquakes in the subduction zone. Using the same rupture model of the Geiyo earthquake, we compared the simulated records from our and the EGF techniques at one near-field station. The comparison shows that this technique gives records which matches in a wide frequency range and that too from simple and easily accessible parameters of burried rupture. © Kluwer Academic Publishers 2004.
Citation: Journal of Seismology (2004), 8(4): 467-484
URI: https://doi.org/10.1007/s10950-004-1595-z
http://repository.iitr.ac.in/handle/123456789/5921
Issue Date: 2004
Keywords: Envelope
Filter
Green's function
Ground motion simulation
Stochastic
Strong motion
Subfault
Transmission
White noise
ISSN: 13834649
Author Scopus IDs: 55682260000
7003745601
Author Affiliations: Joshi, A., Department of Built Environment, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 26-8502, Japan, Department of Earth Sciences, Kurukshetra University, Kurukshetra, Haryana 136 119, India
Midorikawa, S., Department of Built Environment, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 26-8502, Japan
Funding Details: Author sincerely thanks Department of Science and Technology, Government of India for providing financial support in terms of the BOYSCAST fellowship to work in the research topic presented in this paper. Thanks are due to the Department of Earth Sciences, Kurukshetra University, Kurukshetra, India for supporting this research programme. Thanks are also due to Dr K. Fujimoto, Mr Victor Rodriguez and all members of Midorikawa’s lab of the Department of Built Environment, Tokyo Institute of Technology for providing support required for this research work. The strong motion data recorded by the KiK-Net by the National Research Institute for Earth Science and Disaster Prevention (NIED), Japan has been used in the present work. Fruitful suggestions and encouragement by Prof K. Irikura, Disaster Prevention Research Institute, Kyoto University are highly regarded by authors. The first author sincerely thanks Prof Irikura for providing his computer program for EGF simulation used in this work.
Corresponding Author: Joshi, A.; Department of Built Environment, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 26-8502, Japan; email: anushijos@yahoo.co.in
Appears in Collections:Journal Publications [ES]

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