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1 Department of Civil
Engineering
The University of Memphis
Memphis, Tennessee 38152
An alternative approach based on a hybrid-empirical model is utilized to
predict the ground-motion relationship for eastern North America
(ENA). In this approach, a stochastic model is first used to derive
modification factors from the ground motions in western North America
(WNA) to the ground motions in ENA. The ground-motion
parameters are then estimated to develop an empirical attenuation relationship
for ENA using empirical ground-motion relationships from
WNA. We develop an empirical-stochastic source model for both regions
to obtain ground motions at different magnitude–distance range of
interest. At short distances (R 
30 km) and large magnitudes
(Mw 
6.4), an equivalent point-source model is carried
out to consider the effect of finite-fault modeling on the ground-motion
parameters. Source focal depth and Brune stress drop are assumed to be magnitude
dependent. We choose three well-defined empirical attenuation relationships for
WNA to compare the empirical ground-motion processes between the two
regions. A composite functional attenuation form is defined, and, in turn, a
nonlinear regression analysis is performed by using a genetic algorithm
(GA) for a wide range of magnitudes and distances to develop an
empirical attenuation relationship from the stochastic ground-motion estimates
in ENA. The empirical-stochastic attenuation relationship for
horizontal peak ground acceleration and spectral acceleration are applicable to
earthquakes of Mw 5.0–8.2 at distances of up to 1000
km. The resulting attenuation model developed in this study is compared with
those used in the 2002 national seismic hazard maps, derived in the 2003
Electric Power Research Institute studies and recorded in ENA. The
comparison of the results to the other attenuation functions and the available
ENA data show a reasonable agreement for the ENA ground
motions.
Related articles in Bulletin of the Seismological Society of America:
This article has been cited by other articles:
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  K. W. Campbell Estimates of Shear-Wave Q and {kappa}0 for Unconsolidated and Semiconsolidated Sediments in Eastern North America Bulletin of the Seismological Society of America, August 1, 2009; 99(4): 2365 - 2392. [Abstract] [Full Text] [PDF]
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K. W. Campbell Comment on "Empirical-Stochastic Ground-Motion Prediction for Eastern North America" by Behrooz Tavakoli and Shahram Pezeshk Bulletin of the Seismological Society of America, August 1, 2008; 98(4): 2094 - 2097. [Full Text] [PDF]
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B. Tavakoli and S. Pezeshk Reply to "Comment on 'Empirical-Stochastic Ground-Motion Prediction for Eastern North America' by Behrooz Tavakoli and Shahram Pezeshk" by Kenneth W. Campbell Bulletin of the Seismological Society of America, August 1, 2008; 98(4): 2098 - 2100. [Full Text] [PDF]
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