Deterministic Seismic Hazard Analysis of Bharuch City and Surrounding Region

Abstract

The research of seismic hazards along with their preparedness is critical for the development of structures which are both safe and economically effective. Ankleshwar, also known as the "Chemical Capital of India," is located in Bharuch district situated on Gujarat's south-west coast and it is categorised as seismic zone III by the Indian seismic zonation system. Past earthquake data and accessible seismotectonic information were used to conduct a deterministic seismic hazard study of the Bharuch region. After processing earthquake data obtained from 1819 to 2019, a separate seismic catalogue encompassing a 400-kilometer radius around Bharuch city was created. To get rid of the dependent events, the complete catalogue was declustered. Using basic mathematical procedures, the minimum distances from every seismic source generating tectonic activity were estimated. Predictive correlations for the region were used to estimate the Peak Ground Acceleration (PGA) values at bedrock level. The present analysis shows that with a maximum probable earthquake of magnitude 5.8 triggered by the Narmada Son Fault (NSF), the values of PGA of Bharuch region have ranged from 0.086 to 0.51 g. The key design parameters for the Bharuch city and surrounding region are provided by the PGA model discussed in this study.