Deterministic seismic microzonation of Kolkata city |
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| Authors: | Amit Shiuly J P Narayan |
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| Institution: | (1) Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India; |
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| 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. |
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