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Next generation attenuation (NGA) empirical ground motion models: can they be used in Europe?

Kenneth W. Campbell, Yousef Bozorgnia

Proceedings of the 1st European Conference on Earthquake Engineering and Seismology

2006/09/03

We are one of five teams developing empirical ground motion models (attenuation relationships) for active shallow crustal regions as part of the PEER Next Generation Attenuation (NGA) Project. Each NGA Developer Team was provided with a common database of worldwide strong-motion recordings but used different data selection criteria, parameters, and functional forms in the development of their models. One of the biggest challenges was to develop a functional form that accounted for the apparent change in magnitude scaling around M 6.5–7.0 that was indicated by several recent large worldwide earthquakes. We selected a trilinear rather than the more traditional quadratic functional form for magnitude scaling to allow more flexibility in modeling magnitude-scaling effects between small and large earthquakes. Parameters included in the model are moment magnitude, closest distance to rupture, buried reverse faulting, normal faulting, sediment depth (both shallow and basin effects), hanging-wall effects, average shear-wave velocity in the top 30 m, and nonlinear soil response as a function of shear-wave velocity and rock PGA. A comparison of our NGA model with a recent attenuation relationship for Europe indicates that our model and likely the other NGA models can be used in this region. The largest discrepancies appear to be due to the use of linear magnitude scaling and linear site factors in the European model. More detailed evaluations will be needed to confirm this preliminary conclusion.

Geneva, Switzerland

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