ABSTRACT Arias intensity serves as a crucial metric to measure ground motion energy and is extensively utilized in earthquake engineering to analyze structural damage, slope instability, and the potential for soil liquefaction. Nevertheless, in many practical design scenarios, only the response spectrum is available, without corresponding information on Arias intensity. The use of ground motion models of Arias intensity, combined with controlling magnitude and distance along with the response spectrum, provides an alternative approach to estimate Arias intensity; however, this method requires disaggregation and involves approximations in determining the controlling scenario. The present research proposes a new Arias intensity model that relies solely on the response spectrum. First, the relationship between Arias intensity and response spectrum is systematically explored based on random vibration theory. Arias intensity is found to correlate with peak ground acceleration as well as the centroid frequency, bandwidth, and shape of the response spectrum. Subsequently, an Arias intensity model is developed following a statistical analysis of approximately 8300 three‐component recordings from Japan. Finally, comparison with existing Arias intensity models shows that the proposed model achieves accuracy comparable to or better than that of existing models, without requiring source and path information.
You et al. (Tue,) studied this question.