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Minimizing the uncertainties of seismological-geotechnical source parameters using a genetic algorithm approach

Nicknam, A ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. Publisher: Civil-Comp Press , 2008
  3. Abstract:
  4. The main purpose of this article is to estimate the seismological source parameters of the December 26, 2003, Bam earthquake Mw6.5 (Iran). The selected station is far away from the causative fault so that the synthesized ground motion would not be influenced by near source problems such as directivity effects. The well known Empirical Green's Functions (EGF) is used to synthesize the three components of main shock. The Kostrov slip model describing the entire rupture process was incorporated in the model. A generic algorithm (GA) technique is proposed for minimizing the differences between the synthesized time series and those of observed data. The estimated time series were validated by comparing the corresponding elastic response spectra, with those of observed data. The seismological information estimated through this study are the causative fault dimensions and seismological source parameters such as hypocenter location, input p wave velocity, rupture and healing velocities, stress drop, rise time and average slip. Proper matching of the response spectra, corresponding to the synthesized three components, and those of recorded data confirms the suitability of the estimated parameters and the potentiality of the technique in generating strong motion to be used in hazard analysis of structures in the region with lack of data such as Bam. © Civil-Comp Press, 2008
  5. Keywords:
  6. Computer programming ; Earthquakes ; Faulting ; Genetic algorithms ; Green's function ; Time series ; Wave propagation ; Bam earthquake ; Elastic response spectra ; Empirical green's functions ; Estimated parameter ; Genetic algorithm approach ; Hypocenter location ; Source parameters ; Strong motion ; Parameter estimation
  7. Source: 9th International Conference on Computational Structures Technology, CST 2008, Athens, 2 September 2008 through 5 September 2008 ; Volume 88 , 2008 ; 17593433 (ISSN); 9781905088232 (ISBN)