Computation of ground motion amplification in Kolkata megacity (India) using finite-difference method for seismic microzonation

• Autorzy: Shiuly A , Kumar V , Narayan J.P.

Identyfikatory

DOI

10.2478/s11600-013-0169-2

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

viscoelastic; damping; finite difference method; ground motion; amplification; fundamental frequency; seismic microzonation

PL

lepkosprężystość; tłumienie; metoda różnic skończonych; ruch ziemi; wzmocnienie; częstotliwość podstawowa

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2014
• Tom: Vol. 62, no. 3
• Strony: 425--450
• Opis fizyczny: Bibliogr. 39 poz.

Twórcy

autor

Shiuly A

• Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, India

autor

Kumar V

• Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, India

autor

Narayan J.P.

• Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, India

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