Observations on deterministic seismic hazard analysis for the study region, Gujarat

The impulsive amount of energy in the form of seismic waves (body and surface waves) is released during earthquakes and may cause loss of property and life. In this context, hazard analysis becomes an important touchstone to analyse the risk associated with seismic events. Earthquake influences are observed for several kilometres, but severe impact is observed within few kilometres of the epicentre of an earthquake that is a small part of the active fault what generated the earthquake. In this study, the deterministic seismic hazard analysis is carried out for Gujarat, India, considering the 300 km region measured from the Gujarat boundary within Indian territory. The deterministic seismic hazard analysis is carried out and the hazard is evaluated in the form of peak ground acceleration at the bedrock level considering four different scenarios: hazard due to past earthquake data only, hazard due to past earthquake data and all faults considered as active, hazard due to past earthquake data and only active faults and hazard due to past earthquake data and partial length of the active faults considered as active. The evaluated hazard is compared with IS 1893 Part 1 (2016) and those available in the literature. Based on different scenarios considered in the study, the observations on the deterministic seismic hazard analysis for the study region, Gujarat, are drawn.