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Evaluation of spatial variation of peak horizontal acceleration and spectral acceleration for south India: a probabilistic approach

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  • T. Sitharam
  • K. Vipin

Abstract

In this work, an attempt has been made to evaluate the spatial variation of peak horizontal acceleration (PHA) and spectral acceleration (SA) values at rock level for south India based on the probabilistic seismic hazard analysis (PSHA). These values were estimated by considering the uncertainties involved in magnitude, hypocentral distance and attenuation of seismic waves. Different models were used for the hazard evaluation, and they were combined together using a logic tree approach. For evaluating 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 within a radius of 300 km. Rock level PHA values and SA at 1 s corresponding to 10% probability of exceedance in 50 years were evaluated for all the grid points. Maps showing the spatial variation of rock level PHA values and SA at 1 s for the entire south India are presented in this paper. To compare the seismic hazard for some of the important cities, the seismic hazard curves and the uniform hazard response spectrum (UHRS) at rock level with 10% probability of exceedance in 50 years are also presented in this work. Copyright Springer Science+Business Media B.V. 2011

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  • T. Sitharam & K. Vipin, 2011. "Evaluation of spatial variation of peak horizontal acceleration and spectral acceleration for south India: a probabilistic approach," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 59(2), pages 639-653, November.
    • Handle: RePEc:spr:nathaz:v:59:y:2011:i:2:p:639-653
    DOI: 10.1007/s11069-011-9784-x
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    References listed on IDEAS

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    1. T. Sitharam & P. Anbazhagan, 2007. "Seismic Hazard Analysis for the Bangalore Region," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 40(2), pages 261-278, February.
    2. Prakash Kumar & Xiaohui Yuan & M. Ravi Kumar & Rainer Kind & Xueqing Li & R. K. Chadha, 2007. "The rapid drift of the Indian tectonic plate," Nature, Nature, vol. 449(7164), pages 894-897, October.
    3. P. Anbazhagan & J. Vinod & T. Sitharam, 2009. "Probabilistic seismic hazard analysis for Bangalore," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 48(2), pages 145-166, February.
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    1. K. Vipin & T. Sitharam & S. Kolathayar, 2013. "Assessment of seismic hazard and liquefaction potential of Gujarat based on probabilistic approaches," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 65(2), pages 1179-1195, January.
    2. Sarika Desai & Deepankar Choudhury, 2014. "Spatial variation of probabilistic seismic hazard for Mumbai and surrounding region," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 71(3), pages 1873-1898, April.
    3. Naveen James & T. Sitharam & G. Padmanabhan & C. Pillai, 2014. "Seismic microzonation of a nuclear power plant site with detailed geotechnical, geophysical and site effect studies," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 71(1), pages 419-462, March.

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