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Probabilistic seismic hazard analysis for Bangalore

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Abstract

This article presents the results of probabilistic seismic hazard analysis (PSHA) for Bangalore, South India. Analyses have been carried out considering the seismotectonic parameters of the region covering a radius of 350 km keeping Bangalore as the center. Seismic hazard parameter ‘b’ has been evaluated considering the available earthquake data using (1) Gutenberg–Richter (G–R) relationship and (2) Kijko and Sellevoll (1989, 1992) method utilizing extreme and complete catalogs. The ‘b’ parameter was estimated to be 0.62 to 0.98 from G–R relation and 0.87 ± 0.03 from Kijko and Sellevoll method. The results obtained are a little higher than the ‘b’ values published earlier for southern India. Further, probabilistic seismic hazard analysis for Bangalore region has been carried out considering six seismogenic sources. From the analysis, mean annual rate of exceedance and cumulative probability hazard curve for peak ground acceleration (PGA) and spectral acceleration (Sa) have been generated. The quantified hazard values in terms of the rock level peak ground acceleration (PGA) are mapped for 10% probability of exceedance in 50 years on a grid size of 0.5 km × 0.5 km. In addition, Uniform Hazard Response Spectrum (UHRS) at rock level is also developed for the 5% damping corresponding to 10% probability of exceedance in 50 years. The peak ground acceleration (PGA) value of 0.121 g obtained from the present investigation is slightly lower (but comparable) than the PGA values obtained from the deterministic seismic hazard analysis (DSHA) for the same area. However, the PGA value obtained in the current investigation is higher than PGA values reported in the global seismic hazard assessment program (GSHAP) maps of Bhatia et al. (1999) for the shield area.

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Acknowledgments

Authors thank the Department of Science and Technology (DST), Seismology Division, Govt. of India for funding the project “Seismic microzonation of Bangalore” (Ref. No. DST/23(315)/SU/2002 dated October 2003) and ISRO-IISc Space Technology Cell, Indian Institute of Science, Bangalore, India for funding the project titled “Use of remote sensing and GIS for Seismic Hazard Analyses of southern India (Ref. No. ISTC/CCE/TGS/195/2007 dated 07 March 2007). Authors also thank Dr. A. Kijko for providing the computer program (HN2, Release 2.10).

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  1. Department of Civil Engineering, Indian Institute of Science, Bangalore, 560012, India

    P. Anbazhagan, J. S. Vinod & T. G. Sitharam

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  1. P. Anbazhagan
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Correspondence to T. G. Sitharam.

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Anbazhagan, P., Vinod, J.S. & Sitharam, T.G. Probabilistic seismic hazard analysis for Bangalore. Nat Hazards 48, 145–166 (2009). https://doi.org/10.1007/s11069-008-9253-3

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