| dc.description.abstract | Arias Intensity (AI) is a ground motion parameter of an earthquake record as the integral of the square of the acceleration time history. It incorporates the amplitude, frequency content, and duration of the ground-motion, and is likely to be a more reliable predictor of earthquake damage potential. AI correlates well with several commonly used demand measure of structural performance, liquefaction, and seismic slope stability. This study develops the Arias intensity attenuation relationship in Taiwan. A good attenuation equation can reflect the characteristics of the ground-motion attenuation for a region, and can be used to predict the ground-motion value of a specific site for seismic resistance design.
Two local empirical attenuation relationships for the crustal and the subduction zone earthquakes respectively are developed to estimate AI as a function of magnitude, distance, fault mechanism, and continuous site variable-Vs30, based on strong ground-motion data from TSMIP and SMART1 array in Taiwan. Its functional form is derived from the point-source model, and the coefficients are determined through non-linear regression analyses using maximum likelihood method (MLE) and mixed-effects model.
The results show that mixed-effects model with MLE can effectively solve the regression problem in the treatment of uncertainty of the earthquake magnitude and the data weighting. Vs30 and fault mechanism used in the attenuation model can reduce the sigma significantly. The AI value predicted by the crustal earthquake attenuation equation is higher in the near distance and lower in the far distance than previous researches. No previous research was done on the subduction-zone earthquake attenuation for AI. To compared with the crustal earthquake attenuation equation, the subduction zone earthquake attenuation equation predicts significantly higher AI value than the crustal one. This indicates that the AI attenuations behave differently between the crustal earthquakes and the subduction zone earthquakes; similar to other ground-motion parameter do. | en_US |