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Ground Motion Relations for Active Regions in India
Published in Birkhauser Verlag AG
2014
Volume: 171
   
Issue: 9
Pages: 2241 - 2275
Abstract

In this article, a study on development of ground motion prediction equations (GMPEs) is undertaken for seismically active regions in India. To derive the equations, the seismically active regions are divided into four units based on seismotectonic setting and geology. Due to lack of strong motion data, a stochastic finite-fault simulation method is used for generating a complete synthetic database with respect to magnitude and distance. The input parameters in the stochastic seismological model, such as site amplification and stress drop, are first derived from the past strong-motion data. A total of 236 three-component records from 62 earthquakes with magnitudes ranging from Mw 3.4 to 7.8 are used to calibrate the seismological model. The obtained stress drops of these 62 events lie in between 60 and 165 bars. With the help of a large synthetic database generated from the calibrated seismological model, ground motion relations for 5 % damped spectral acceleration are obtained by regression analysis. The developed ground motion relations are compared with the existing GMPEs of the other active regions in the world. Although the proposed equations have trends similar to those of the existing relations, there are some differences attributed to stress drop and the quality factor of active regions in India. These relations will be useful to prepare spectral acceleration hazard maps of India for a given annual probability of exceedance. © 2014, Springer Basel.

About the journal
JournalPure and Applied Geophysics
PublisherBirkhauser Verlag AG
ISSN00334553
Open AccessNo
Concepts (13)
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    Active regions
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    Ground motions
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    RESPONSE SPECTRA
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    Seismic hazards
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    SEISMOLOGICAL MODELS
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    Computer simulation
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    Earthquake magnitude
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    EARTHQUAKE PREDICTION
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    Ground motion
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    Seismic hazard
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    Seismic response
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    Seismology
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    India