Region specific seismic hazard analysis of Krishna Raja Sagara Dam, India

Region-specific seismic hazard analysis was carried out for Krishna Raja Sagara Dam site in Karnataka, India. Seismic event data and seismic source data within a 500 km radius were collected. Deterministic seismic hazard analysis was conducted for different methods of earthquake magnitude and location estimation. It was observed that the ground motion estimates vary widely with different methods of Mmax estimation and that the rupture based method, which calculates Mmax based on fault dimensions, can give a reliable estimate of the possible maximum magnitude in regions of low to moderate seismicity. Based on this study, the greatest median ground motion at the dam site is estimated as 0.43 g and the ground motion required to be tolerated without catastrophic failure is considered as 0.11 g. In Stable Continental Regions across the world, where earthquake data is scarce, the methodology followed here can be adopted to conduct region-specific seismic hazard analysis