Seismic hazard assessment and site-specific response spectrum at bed rock level for Ongole city, India: a deterministic framework

In this study, a detailed deterministic seismic hazard analysis of Ongole city, Andhra Pradesh, India, has been conducted. Owing to its historical seismic activity and regional tectonics, a control region with a radius of 500 km around the Ongole collectorate (Latitude 15.4988º N, Longitude 80.0497º...

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Published in:	Environmental earth sciences 2024-03, Vol.83 (6), p.156
Main Authors:	Siddhardha, R., Rathod, Kiran, Gonavaram, Kalyan Kumar
Format:	Article
Language:	eng
Subjects:	Biogeosciences Earth and Environmental Science Earth Sciences Earthquake resistance Earthquakes Environmental Science and Engineering Geochemistry Geological hazards Geology Ground motion Hazard assessment Hydrology/Water Resources Original Article Retrofitting Rocks Seismic activity Seismic hazard Spatial variations Tectonics Terrestrial Pollution
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Summary:	In this study, a detailed deterministic seismic hazard analysis of Ongole city, Andhra Pradesh, India, has been conducted. Owing to its historical seismic activity and regional tectonics, a control region with a radius of 500 km around the Ongole collectorate (Latitude 15.4988º N, Longitude 80.0497º E) was selected for identifying seismic sources and development of seismotectonic map. A total of 59 seismic sources were identified, and the maximum magnitude ( M max ) for each source was determined by considering regional rupture characteristics and various deterministic methods. Eleven Ground Motion Prediction Equations (GMPEs), including those developed for Peninsular India as well as similar tectonic regions elsewhere, were taken into account and the log-likelihood (LLH) method applied to assign weightage factors to each GMPE. The city of Ongole was divided into 180 grid points, each measuring 0.004º × 0.004º (equivalent to 0.4 km × 0.4 km). Spatial variations of rock site Peak Ground Acceleration (PGA) maps were plotted for Scenarios 1, 2, and 3 considering Deterministic Seismic Hazard Analysis (DSHA). Based on the findings of the study, it is observed that PGA ranges from 0.148 to 0.173 g for Scenario 1, from 0.188 to 0.220 g for Scenario 2, and from 0.168 to 0.196 g for Scenario 3 with controlling source of Gundlakamma Fault. Additionally, a comparative assessment was carried out between the results of this study, past studies in the literature, and the IS 1893 (Part 1) (Criteria for earthquake resistance design of structures, part-I. Bureau of Indian Standard, New Delhi, 2016) codal provisions. Finally, the response spectrum has been plotted for the Ongole collectorate, considering all three scenarios. The outcomes of the present study could significantly assist insurance agencies in policy-making and aid builders in designing new structures and retrofitting existing ones.
ISSN:	1866-6280 1866-6299