08-10-2014, 04:26 PM
India has experienced a large number of earthquakes in the past. The number of strong motion records from these earthquakes is very small, and is not sufficient to be used for the development of attenuation relationships and to evaluate seismic risk for future earthquake. On the country, maps are available for a substantial number of earthquakes and it is prudent to use these for the development of attenuation relationships. In this study, 59 earthquakes from different parts of the country have been considered. The isoseismals are collected from different sources. All the isoseismals along with their intensity distance data are presented in a tabular form. The Indian subcontinent is divided into six attenuation provinces, viz., Northwest, North, Northeast, Peninsular, Foredeep and Subduction. Different attenuation models are tried and best model has been found. For the first time, Indian subcontinent models relating magnitude and maximum intensity have been developed. Intensity Attenuation relationships have been developed for each region. A single equation is also dev