Seismic hazard assessment and significance of ground motion prediction equations: a deterministic approach

Earthquakes have the most dominating societal and economic impact on the built environment. The earthquakes in an intraplate region are infrequent but often damaging. The uncontrolled urban growth in cities due to population explosion and migration makes it necessary to assess seismic hazards in an active region. Seismic hazard modeling is a multidisciplinary science that aims to forecast earthquake occurrence and its resultant ground shaking. In the present study, past tectonic earthquake records were observed for the study area and peak ground acceleration was calculated using the deterministic seismic hazard (DSHA) approach. This study quantifies seismic hazard around the district headquarter in Durg of Chhattisgarh. A seismic investigation was performed in the seismic control region over a radius of 300 km. Then, the seismotectonic map was prepared by compiling the earthquake data from 1846 to 2022. The present research then applied a completeness test over the above-collected earthquake data. The seismic parameters a and b values were calculated, and a regional recurrence relationship has been developed. The well-known attenuation model for Peninsular India is considered for estimating the ground motion uniqueness at the bedrock level. The maximum Peak Ground Acceleration (PGA) values for Durg district headquarters and Tandula dam are obtained for 84 percentiles as 0.10172 and 0.08241 g. The results obtained in the present study will be useful for designing seismic-resistant structures in and around the Durg district headquarter. © 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG.