ABSTRACT
The increasing earthquake activity in Peninsular India highlights the need for region-specific seismic hazard assessments. This study focuses on seismic ground response analysis for the Tirupati region in Andhra Pradesh, classified under Seismic Zone III as per IS 1893. The area, known for its heritage structures, has experienced minor earthquakes. A seismotectonic map within a 300 km radius from Tirupati railway station was analyzed. One-dimensional non-linear ground response analyses (1-D NLGRA) were conducted at three sites: two in Tirupati (site-1), one in Srikalahasti (site-2), and one in Yerpedu (site-3). Ground motions were chosen based on deterministic seismic hazard analysis. The results showed amplification factors ranging from 1.78 to 2.36 at 0.5 seconds for site-1, 1.62 at 0.32 seconds for site-2, and 1.19 at 0.25 seconds for site-3, highlighting varying site-specific seismic responses across the region.
