Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 9 3 2009 10.5194/nhess-9-865-2009 http://www.nat-hazards-earth-syst-sci.net/9/865/2009/ http://www.nat-hazards-earth-syst-sci.net/9/865/2009/nhess-9-865-2009.html http://www.nat-hazards-earth-syst-sci.net/9/865/2009/nhess-9-865-2009.pdf 865 878 2009-06-16 Estimation of peak ground acceleration and spectral acceleration for South India with local site effects: probabilistic approach K. S. Vipin P. Anbazhagan T. G. Sitharam sitharam@civil.iisc.ernet.in Department of Civil Engineering, Indian Institute of Science, Bangalore-560012, India In this work an attempt has been made to evaluate the seismic hazard of South India (8.0° N–20° N; 72° E–88° E) based on the probabilistic seismic hazard analysis (PSHA). The earthquake data obtained from different sources were declustered to remove the dependent events. A total of 598 earthquakes of moment magnitude 4 and above were obtained from the study area after declustering, and were considered for further hazard analysis. The seismotectonic map of the study area was prepared by considering the faults, lineaments and the shear zones in the study area which are associated with earthquakes of magnitude 4 and above. For assessing the seismic hazard, the study area was divided into small grids of size 0.1°×0.1°, and the hazard parameters were calculated at the centre of each of these grid cells by considering all the seismic sources with in a radius of 300 km. Rock level peak horizontal acceleration (PHA) and spectral acceleration (SA) values at 1 s corresponding to 10% and 2% probability of exceedance in 50 years have been calculated for all the grid points. The contour maps showing the spatial variation of these values are presented here. Uniform hazard response spectrum (UHRS) at rock level for 5% damping and 10% and 2% probability of exceedance in 50 years were also developed for all the grid points. The peak ground acceleration (PGA) at surface level was calculated for the entire South India for four different site classes. These values can be used to find the PGA values at any site in South India based on site class at that location. Thus, this method can be viewed as a simplified method to evaluate the PGA values at any site in the study area. Anbazhagan, P., Vinod, J. S., and Sitharam, T. G.: Probabilistic seismic hazard Analysis for Bangalore, Nat. hazards, 8, 145–166 2009. Basu, S. and Nigam, N. C.: Seismic risk analysis of Indian peninsula, in: Proc. 6th World Conf. Earthqu. Engg., New Delhi, 1, 782–788, 1977. Bhatia, S. C., Ravi Kumar, M., and Gupta, H. K.: A Probabilistic Seismic Hazard Map of India and Adjoining Regions, 1–12, available at: http://www.seismo.ethz.ch/gshap/ict/india.html, 1997. BIS-1893: Indian Standard Criteria for Earthquake Resistant Design of Structures, Part 1 – General Provisions and Buildings, Bureau of Indian Standards, New Delhi, 2002. BSSC: NEHRP recommended provisions for seismic regulations for new buildings and other structures 2000 edition, part 1: Provisions, Report no FEMA 368, Building seismic safety council for the federal emergency management agency, Washington, DC, USA, 2001. Cornell, C. A.: Engineering seismic risk analysis, B. Seismol. Soc. Am., 58, 1583–1606, 1968. Eurocode 8.: BS-EN 1998-1, Design of structures for earthquake resistance – part 1: General rules, seismic actions and rules for buildings, European committee for standardization, Brussels, 2005. Ganesha Raj, K. and Nijagunappa, R.: Major Lineaments of Karnataka State and their Relation to Seismicity Remote Sensing Based Analysis, J. Geol. Soc. India, 63, 430–439, 2004. Gangrade, B. K. and Arora, S. K.: Seismicity of the Indian Peninsular Shield from Regional Earthquake Data, Pure Appl. Geophys., 157, 1683–1705, 2000. Gosavi, P. D., Bapat, A. V., and Guha, S. K.: Maeroseismic studies of four reeenl Indian earthquakes, in: Proc. World Conf. Earthquake Engg., 6th, New Delhi, 1, 49–54, 1977. Gubin, I. E.: Seismic zoning of Indian peninsula, Bull. Intern. Inst. Seism. Earthquake Eng., 5, 109–139, 1968. Guha, S. K.: Seismic regionalization of India, 2nd Sym. Earthquake Engg., Roorkee, 191–207, 1962. Gutenberg, B. and Richter, C. F.: Frequency of earthquakes in California, B. Seismol. Soc. Am., 34 185–188, 1944. Heaton, T. H., Tajima, F., and Mori, A. W.: Estimating Ground motions using recorded Accelerograms, Surv. Geophys., 8(1), 25–83, 1986. Iyengar, R. N. and Ghosh, S.: Microzonation of earthquake hazard in greater Delhi area, Curr. Sci. India, 87, 1193–1202, 2004. Iyengar, R. N. and Raghukanth, S. T. G.: Attenuation of Strong Ground Motion in Peninsular India, Seismol. Res. Lett., 75(4), 530–540, 2004. Jade, S.: Estimates of plate velocity and crustal deformation in the Indian subcontinent using GPS geodesy, Curr. Sci. India, 86, 1443–1448, 2004. Jaiswal, K. and Sinha, R.: Probabilistic Modeling of Earthquake Hazard in Stable Continental Shield of the Indian Peninsula, ISET Journal of earthquake technology, 43(3), 49–64, 2006. Jaiswal, K. and Sinha, R.: Probabilistic seismic-hazard estimation for peninsular India, B. Seismol. Soc. Am., 97(1B), 318–330, 2007. Kaila, K. L., Gaur, V. K., and Narain, H.: Quantitative seismicity maps of India, B. Seismol. Soc. Am., 62, 1119–1131, 1972. Kaila, K. L. and Rao, N. M.: Seismic zoning maps of the Indian subcontinent, Geophys. Res. Bull., 17, 293–301, 1979. Kelkar, Y. N.: Earthquakes experienced in Maharashtra during the last 300 years, Daily Kesari Poona, Marathi, January 7, 1968. Khatri, K. N., Rogers, A. M., and Algermissen, S. T.: A seismic hazard map of India and adjacent areas, Tectonophysics, 108, 93–134, 1984. Kiureghian, D. A. and Ang, A. H. S.: A fault-rupture model for seismic risk analysis, B. Seismol. Soc. Am., 67(4), 1173–1194, 1977. Kramer, S. L.: Geotechnical Earthquake Engineering, Pearson Education Pvt. Ltd, Reprinted 2003, Delhi, India, 1996. Krishna, J.: Seismic zoning of India, in: Earthquake Engg., Seminar, Roorkee University, India, 32–38, 1959. Kumar, P., Yuan, X., Ravi Kumar, M., Kind, R., Li, X., and Chadha, R. K.: The rapid drift of Indian tectonic plate, Nature, 449, 894–897, 2007. Mandal, P., Rastogi, B. K., and Gupta, H. K.: Recent Indian earthquakes, Curr. Sci. India, 79(9), 1334–1346, 2000. McGuire, R. K. and Arabasz, W. J.: An introduction to probabilistic seismic hazard analysis, in: Geotechnical and Environmental Geophysics, edited by: Ward, S. H., Society of Exploration Geophysicist, 1, 333–353, 1990. Milne, J.: A Catalogue of Destructive Earthquakes, A.D. 7 to A.D. 1899, British Association for the Advancement of Science, London, 92~pp., 1911. Oldham, T. A.: Catalogue of Indian earthquakes, Mem. Geol. Surv. India, 19, 163–215, 1883. Purnachandra Rao, N.: Single station moment tensor inversion for focal mechanisms of Indian intra-plate earthquakes, Curr. Sci. India, 77, 1184–1189, 1999. Raghu Kanth, S. T. G. and Iyengar, R. N.: Seismic hazard estimation for Mumbai city, Curr. Sci. India, 91(11), 1486–1494, 2006. Raghu Kanth, S. T. G. and Iyengar, R. N.: Estimation of Seismic Spectral Acceleration in Peninsular India, J. Earth Sys. Sci., 116(3), 199–214, 2007. Ram, A. and Rathor, H. S.: On frequency magnitude and energy of significant Indian earthquakes, Pure Appl. Geophys., 79, 26–32, 1970. Ramalingeswara Rao, B.: Historical Seismicity and deformation rates in the Indian Peninsular Shield, J. Seismol., 4, 247–258, 2000. Ramalingeswara Rao, B. and Sitapathi Rao, P.: Historical Seismicity of Peninsular India, B. Seismol. Soc. Am., 74, 2519–2533, 1984. Reddy, P. R: Need for high-resolution deep seismic reflection studies in strategic locales of South India, Curr. Sci. India, 84(8), 973–974, 2003. Regulatory Guide 1.165: Identification and characterization of seismic sources and determination of safe shutdown earthquake ground motion, US Nuclear Regulatory Commission, 1997. Scordilis, E. M.: Empirical global relations converting ms and mb to moment magnitude, J. Seismol., 10, 225–236, 2006. Seeber, L., Armbruster, J. G., and Jacob, K. H.: Probabilistic Assessment of Seismic Hazard for Maharashtra, Govt. of Maharashtra, Unpublished Report, 1999. SEISAT: Seismotectonic Atlas of India, Geological Survey of India, 2000. Sitharam, T. G. and Anbazhagan, P.: Seismic Hazard Analysis for the Bangalore Region, Nat. Hazards, 40, 261–278, 2007. Sitharam, T. G., Anbazhagan, P., and Ganesha Raj, K.: Use of remote sensing and seismotectonic parameters for seismic hazard analysis of Bangalore, Nat. Hazards Earth Syst. Sci., 6, 927-939, 2006. Srivastava, H. N. and Ramachandran, K.: New catalogue of earthquakes for Peninsular India during 1839–1900, Mausam, 36(3), 351–-358, 1983. Stepp, J. C.: Analysis of the completeness of the earthquake sample in the Puget Sound area and its effects on statistical estimates of earthquakes hazard, in: Proc. Inter. Conf. Microzonation for safer construct, Res. Appl. Seattle, Washington, 64(4), 1189–1207, 1972. Tandon, A. N.: Zoning of India liable to earthquake damage, Indian Journal of Meteorology and Geophysics, 10, 137–146, 1956. Turner, H. H.: Seismological investigations XII, seismic activity, 1899–1903 inclusive, British Association for the Advancement of Science, London, 57–65, 1911. Valdiya, K. S.: Tectonic framework of India: A review and interpretation of recent structural and tectonic studies, Geophys. Res. Bull. 11, 79–114, 1973. Wells, D. L. and Coppersmith, K. J.: New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement, B. Seismol. Soc. Am., 84, 974–1002, 1994.