Ground Motion Prediction Equation for Pga and Sa Based on the Brune Extended Source Model


Abstract eng:
In this paper theoretical ground motion prediction model is applied to data from four of the largest earthquakes that occured in South Iceland from 1987-2008. The model is based on the Brune point source model that has been extended by using an exponential function to represent spectral decay. A closed form reprentation for both PGA and response spectra can be obtained by applying Parseval’s theorem and carrying out the integration using a frequency domain representation. Peak factors relating rms and peak values are then applied. The model is presented as a GMPE for South-Iceland that can either give PGA or spectral acceleration as a function of distance from fault and seismic moment. Most of the model parameters are estimated by applying optimization in the frequency domain using ground motion records. Applying the stochastic method the theoretical model is used for simulating ground motion records for the four largest earthquakes in South Iceland from1987-2008. Here the near- and far-field equations for the ground motion and response are put foreward. Then the models are applied to the equations and an example given for the attenuation of ground motion for the earthquake on 21st June 2000. A comparison is made with empirical ground motion models based on European data that are commonly used for seismic hazard studies. An example of applying point source models to estimate response spectra for sites close to the earthquake fault and comparing the estimates obtained using near- and far-field models with the average response obtained from strong-motion records obtained during the earthquake.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 4553.:
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