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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 83
PROCEEDINGS OF THE EIGHTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping, G. Montero and R. Montenegro
Paper 245
Stochastic Simulation Based on Finite-Fault Modelling from the 22 February 2005 (M 6.4) Zarand Earthquake in Iran A. Nicknam, A. Yazdani and S. Yaghmaei
Department of Civil Engineering, Iran University of Science and Technology, Tehran, Iran Full Bibliographic Reference for this paper
A. Nicknam, A. Yazdani, S. Yaghmaei, "Stochastic Simulation Based on Finite-Fault Modelling from the 22 February 2005 (M 6.4) Zarand Earthquake in Iran", in B.H.V. Topping, G. Montero, R. Montenegro, (Editors), "Proceedings of the Eighth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 245, 2006. doi:10.4203/ccp.83.245
Keywords: stochastic, finite fault, omega-square, simulation, spectra decay parameter, quality factor, elastic response spectra.
Summary
To adequately design an earthquake resistant structure, designers need to
know the dynamic characteristic of the estimated ground motion particularly in non-linear analysis for a given location. In principal, ground motions are predicted by
identifying the major regional faults (or source zones) and propagating the generated
seismic waves from the ruptured sources to the site of interest.
Acceleration time histories, recorded during the destructive 22 February 2005 (M6.4) Zarand earthquake, have been simulated using a stochastic modelling technique using the finite fault method proposed by Beresnev and Atkinson [1,2]. In this method, the finite fault plane is subdivided into elements, each element is assigned a stochastic spectrum based on the method proposed by Boore [3], and the delayed contributions from all subfaults are summed in the time domain. The recorded earthquake at Zarand station, which was 17 km from the epicentre was simulated as the first step. In the second step the results were validated with those of the observed event. The comparison was carried out with the strong motion acceleration time history, acceleration, velocity and the displacement elastic response spectra.
Finite-fault effects contribute not only to the duration and directivity of the
ground motion; but also affect the shape of the spectra of the seismic waves. In this
method, the classic Fourier spectrum of the ground acceleration near a point dislocation
(an
In this methodology, modelling of the finite source requires information on the
orientation and the dimensions of the fault plane [1,2], as well as information on the
dimensions of the subfaults and the location of the hypocenter. The material
properties are described by the density,
The propagation model includes parameters for the geometric spreading, the
anelastic attenuation, and the near surface attenuation, as well as site amplification
factors. For the geometric attenuation, an operator
We simulated the strong motion acceleration time history recorded during
the 2005 Zarand destructive earthquake, using the stochastic finite-fault method [1,2].
The results were validated with those of the observed data. A good agreement was
shown between the simulated and observed earthquakes which confirm that, the
selected and calculated source parameters were satisfactorily reliable. In this paper, the
peak ground accelerations obtained and the acceleration response spectra were
shown to be insensitive with respect to the coefficients of the frequency dependent anelastic
attenuation, The validity of the model confirms that, it can be used for generating strong motion time histories to be used in the linear and nonlinear analysis of structures such as the essential oil industrial buildings in Iran. References
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