Journal : Acta Geophysica
Article : Computation of ground motion amplification in Kolkata megacity (India) using finite-difference method for seismic microzonation

Authors :
Shiuly, A
Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, India,
Kumar, V
Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, India,
Narayan, J.P.
Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, India,,
Abstract : This paper presents the ground motion amplification scenario along with fundamental frequency (F0) of sedimentary deposit for the seismic microzonation of Kolkata City, situated on the world’s largest delta island with very soft soil deposit. A 4th order accurate SH-wave viscoelastic finite-difference algorithm is used for computation of response of 1D model for each borehole location. Different maps, such as for F0, amplification at F0, average spectral amplification (ASA) in the different frequency bandwidth of earthquake engineering interest are developed for a variety of end-users communities. The obtained ASA of the order of 3-6 at most of the borehole locations in a frequency range of 0.2510.0 Hz reveals that Kolkata City may suffer severe damage even during a moderate earthquake. Further, unexpected severe damage to collapse of multi-storey buildings may occur in localities near Hoogly River and Salt Lake area due to double resonance effects during distant large earthquakes.

Keywords : lepkosprężystość, tłumienie, metoda różnic skończonych, ruch ziemi, wzmocnienie, częstotliwość podstawowa, viscoelastic, damping, finite-difference method, ground motion, amplification, fundamental frequency, seismic microzonation,
Publishing house : Instytut Geofizyki PAN
Publication date : 2014
Number : Vol. 62, no. 3
Page : 425 – 450

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Qute : Shiuly, A ,Kumar, V ,Narayan, J.P. ,Narayan, J.P. , Computation of ground motion amplification in Kolkata megacity (India) using finite-difference method for seismic microzonation. Acta Geophysica Vol. 62, no. 3/2014