Deterministic seismic scenario for Gujarat region, India |
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Authors: | Sumer Chopra Dinesh Kumar B K Rastogi Pallabee Choudhury R B S Yadav |
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Institution: | (1) Seismology Division, Ministry of Earth Sciences, CGO Complex, New Delhi, 110003, India;(2) Department of Geophysics, Kurukshetra University, Kurukshetra, 136119, Haryana, India;(3) Institute of Seismological Research, Raisan, Gandhinagar, 382009, Gujarat, India;(4) Indian National Centre for Ocean Information Services, Ocean Valley, P.B. No. 21, IDA Jeedimetla P.O., Hyderabad, 500055, Andhara Pradesh, India |
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Abstract: | In this study, the modified stochastic method based on dynamic corner frequency has been used for the simulation of strong
ground motions in Gujarat region. The earthquake-generating faults have been identified in the Gujarat region on the basis
of past seismicity of the region. In all, 19 probable faults have been identified with 12 in Kachchh region, 5 in Saurashtra
and 2 in Mainland Gujarat region. The maximum magnitude has been assigned to each fault based on the regional tectonic environment
and past seismicity. The strong ground motions from these identified sources have been estimated at numerous points distributed
all over Gujarat region on a grid. The peak ground acceleration (PGA) values have been extracted from the accelerograms and
contoured. The spatial distribution of maximum of 19 PGA values at every grid point have been described and discussed. The
ground motions at the surface of 32 important cities of the Gujarat have been estimated by incorporating the site amplification
functions. The site amplification functions are obtained using the local earthquake data. These cities are located on various
types of geological formations. We note that the site amplification functions have modified the character of the records and
amplified the acceleration values at almost all the sites. The Kachchh region can expect surface accelerations between 400
and 800 cm/s2, Saurashtra between 100 and 200 cm/s2 and Mainland less than 50 cm/s2 from a future large earthquake. The obtained results are useful for disaster mitigation measures, strengthening the existing
built environment and design of structures in the region. |
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