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

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Abstract

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 (Mmax) 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.

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The authors did not receive any financial support or funding to carry out this investigation.

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All authors were involved in shaping the study’s concept and design. SR was responsible for conceptualization, investigation, data curation, and drafting of the initial manuscript. KR conducted formal analyses, handled visualization, and managed software aspects. KKG played a role in conceptualization, defining the methodology, providing supervision, and reviewing the original draft. Following thorough scrutiny, all authors gave their approval to the final version of the manuscript.

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Correspondence to Kalyan Kumar Gonavaram.

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The authors affirm that there are no financial involvements or personal connections that could potentially introduce bias or create the perception of bias in the work described in this manuscript. This declaration underscores the transparency and integrity of the research process. There are no conflicts of interest pertinent to the publication of this paper.

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Throughout the duration of this study, strict adherence to ethical guidelines and principles was rigorously maintained.

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Siddhardha, R., Rathod, K. & Gonavaram, K.K. Seismic hazard assessment and site-specific response spectrum at bed rock level for Ongole city, India: a deterministic framework. Environ Earth Sci 83, 156 (2024). https://doi.org/10.1007/s12665-024-11460-1

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  • DOI: https://doi.org/10.1007/s12665-024-11460-1

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