Ground motion relations for India

Abstract

In this article, a study on attenuation of ground motion is undertaken for India. To derive the relations, India is divided into seven regions based on seismo-tectonic setting and geology. Due to lack of strong motion data, finite source seismological model is used for generating synthetic database. The input parameters in the seismological model are taken specific to the region. Uncertainty in the model parameters is considered. With the help of large synthetic database, ground motion relations for 5 % damped spectral acceleration are obtained by regression analysis. The developed ground motion relations are useful in preparing spectral acceleration hazard maps of India for a given annual probability of excedance.