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Deterministic seismic microzonation of Kolkata city

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  • Amit Shiuly
  • J. Narayan

Abstract

This paper presents the deterministic seismic microzonation of densely populated Kolkata city situated on the world’s largest delta island with very soft and thick soil deposit in the surficial layers. A fourth-order accurate staggered-grid finite-difference algorithm for SH-wave propagation simulation in visco-elastic medium is used for the linear computation of ground motion amplifications in sedimentary deposit. Different maps such as for fundamental frequency (F 0 ), peak ground acceleration (PGA), peak ground velocity, and peak ground displacement are developed for variety of end-users communities, including structural and geotechnical engineers for performance-based designs, building officials, emergency managers, land-use planners, private businesses, and the general public. The scenario of simulated amplification factors in the different frequency bands revealed that the Kolkata city is very much prone to severe damage even during a moderate earthquake and very selective damage may occur at some of the localities during local and distant earthquakes. The deterministically predicted PGA at bedrock level is 0.0844 g and the maximum PGA predicted at the free surface is 0.6 g in Kolkata city due to maximum credible earthquake (M w = 5.4) associated with Eocene Hinge Zone at a depth of 36 km. The seismic microzonation of Kolkata city reveals that the Nager Bazar and Nimtala areas are the safest regions with earthquake point of view. Copyright Springer Science+Business Media B.V. 2012

Suggested Citation

  • Amit Shiuly & J. Narayan, 2012. "Deterministic seismic microzonation of Kolkata city," 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. 60(2), pages 223-240, January.
    • Handle: RePEc:spr:nathaz:v:60:y:2012:i:2:p:223-240
    DOI: 10.1007/s11069-011-0004-5
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    References listed on IDEAS

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    1. Ranjit Das & H. Wason & M. Sharma, 2011. "Global regression relations for conversion of surface wave and body wave magnitudes to moment magnitude," 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 801-810, November.
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    Cited by:

    1. M. L. Burnwal & A. Burman & P. Samui & D. Maity, 2017. "Deterministic strong ground motion study for the Sitamarhi area near Bihar–Nepal 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. 87(1), pages 237-254, May.
    2. Kaustav Chatterjee & Deepankar Choudhury, 2013. "Variations in shear wave velocity and soil site class in Kolkata city using regression and sensitivity analysis," 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. 69(3), pages 2057-2082, December.
    3. Nisha Naik & Deepankar Choudhury, 2015. "Deterministic seismic hazard analysis considering different seismicity levels for the state of Goa, India," 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. 75(1), pages 557-580, January.

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