Estimation of Seismic Ground Motions Using Deterministic Seismic Hazard Analysis for Amaravati City, India

Amaravati is the proposed capital city of Andhra Pradesh, India. Considering the critical structures and infrastructure systems to be built in the near future, the proposed capital city needs a seismic investigation. In the present study, an attempt was made to quantify the seismic hazard of Amaravati city (Latitude 16 degrees 24 ' 36 '' N to 16 degrees 35 ' 24 '' N and Longitude 80 degrees 24 ' 25 '' E to 80 degrees 36 ' 18 '' E), India, using a deterministic framework. The seismotectonic map is prepared by considering the seismic events of the moment magnitude MW >= 3.5 for the period 1800-2021. The seismic hazard of the Amaravati city is presented in the form of spatial variation of peak ground acceleration (PGA) at bedrock level for four scenarios. It is found that the maximum PGA values obtained for all four scenarios, i.e., 0.227 g, 0.414 g, 0.188 g, and 0.278 g, are higher than the values recommended by IS 1893-Part I (IS 1893 (Criteria for earthquake-resistant design of structures, part 1: general provisions and buildings). Bureau of Indian Standards, New Delhi, 2016). The spatial variation of 50th and 84th percentile spectral accelerations at short and long periods shows the high seismic hazard at southeastern part of Amaravati. The deterministic response spectra are developed for six important regions of Amaravati city. The study's findings will be very useful for the earthquake-resistant design of upcoming civil engineering structures in Amaravati city.