Deterministic Seismic Hazard Analysis For Shallow Earthquakes For Ballar Dam of Chhattisgarh State (India)

Ashish K. Parashar, S. Atmapoojya, S.S. Rathore

Seismic vulnerability analysis, an approach to get an estimate of the strong ground-motions at any particular site, is mainly intended for earthquake resistant designs or for seismic safety assessments. The hazard study usually attempts to analyze two different kinds of anticipated ground motions, “The Probablistic Seismic Hazard Analysis” (PSHA) and “The Detemininstic Seismic Hazard Analysis” (DSHA). A sincere effort is made herein to do seismic hazard analysis for Ballar Dam of Chattisgarh state . An attempt was made to compile the occurrence of past and recent seismic activities within 300 km radius, around the Dam site. Further the seismic hazard analysis was carried out at substratum level in terms of PGA using (DSHA), deterministic seismic hazard analysis technique The main benchmark and indicator involved in carrying out the hazard analysis is the correctness and completeness of the data which needs to be attained. The knowledge presented in this paper helps in evaluating the seismicity of the region around, Ballar Dam Site after statistical analysis of the database. Finally the results are furnished in the form of peak ground acceleration (PGA) for 50 Percentile & 84 Percentile with 100 years of Recurrence Period which can be used directly by engineers as fundamental considerations, for generating earthquake-resistant design of structures in and around Ballar Dam.