Attenuation relationship of Arias intensity

In this paper, the strong ground motion data recorded in earthquakes of western America, central Asia, and Taiwan area are selected from the Next Generation Attenuation strong motion database to develop the attenuation relationship of Arias intensity. A step-regression method is applied to obtain the coefficients of near-field saturation, distance, magnitude, fault type and site classification in the attenuation model. The distribution of residuals with distance and magnitude is analyzed by comparing the regression results with the actual data. The comparison of this attenuation model with those from previous studies shows that all these models are similar for M_W6.5 or in the far field, but have some differences in the near field when the magnitude is higher or lower. Finally, the strong motion data of Wenchuan earthquake and Lushan earthquake are taken to verify the model, and the result show the attenuation relationship fits the data very well, suggesting that the obtained model in this paper be suitable for Chinese mainland.