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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/5904
Title: Simulation of strong ground motion due to great earthquake in the central seismic gap region of Uttarakhand Himalaya
Authors: Mohan K.
Joshi A.
Published in: Natural Hazards
Abstract: Uttarakhand Himalaya in India lies in the central seismic gap region identified by Khattri and Tyagi (Tectonophysics 96:281-297, 1983). Most of the area in Uttarakhand state has been placed under zone V (the highest seismic zone) and zone IV (second highest seismic zone) of the seismic hazard map published by Bureau of Indian standard, Govt. of India (BIS in Indian standards code of practice for earthquake resistant Design of Structures, Indian Standards Institution, New Delhi, 2002). Some of the thrust/faults in the region manifest evidence of neotectonics and recurrent seismicity (Valdiya and Pant in Indian Nat Sci Acad 112-117, 1986; Valdiya in Geodynamics of NW Himalaya Gondwana Research Group Memoir 1999; Thakur in Curr Sci 86(II):1544-1560, 2004; Paul et al. in Seismotectonic implications of data recorded by DTSN in the Kumaon region of Himalaya 2004). On the basis of strain accumulation, Bilham et al. (Science 293:1442-1444, 2001) suggested a future magnitude of M ? 8 in this region. Therefore, a great earthquake along main central thrust in the central seismic gap region has been modeled using semi-empirical technique of Joshi and Mohan (J Seismol 12:35-51, 2008). For modeling great earthquake, the shear wave quality factor Q?(f) = 30f1.45 (Joshi et al. in J Earthq Technol 47(1):508, 2010) has been used for Pithoragarh region of Kumaon Himalaya. The strong-motion parameters [peak ground acceleration (PGA), spectral acceleration, and normalized spectral acceleration] are computed at five stations (Sobla, Didihat, Munsiari, Dharchula, and Pithoragarh) in Uttarakhand Himalaya. The maximum PGA of the order of "2g" is computed due to scenario great earthquake in the region at Sobla station. Such type of study is quite helpful for seismic-resistant designs of the buildings in earthquake-prone areas and is essentially required in Uttarakhand Himalaya. © 2013 Springer Science+Business Media Dordrecht.
Citation: Natural Hazards (2013), 69(3): 1733-1749
URI: https://doi.org/10.1007/s11069-013-0773-0
http://repository.iitr.ac.in/handle/123456789/5904
Issue Date: 2013
Keywords: Great earthquake
Normalized spectra
Peak ground acceleration
Peak spectral acceleration
Seismic gap
ISSN: 0921030X
Author Scopus IDs: 23393116800
55682260000
Author Affiliations: Mohan, K., Institute of Seismological Research, Raisan, Gandhinagar, 382009 Gujarat, India
Joshi, A., Department of Earth Science, Indian Institute of Technology (IIT), Roorkee, Uttarakhand, India
Funding Details: In order to have some preliminary idea of strong ground motion due to a great earthquake in this region, we have simulated the accelerograms using the modified semiempirical approach. This approach requires the H/V ratio curves on the site at which synthetic ground motion needs to be generated. For the generation of synthetic strong-motion records, we have used the data from strong-motion network of five stations installed in the Pithoragarh region of Kumaon Himalaya under a major project funded by Department of Science and Technology, Govt. of India. Data recorded by this network have been used for estimating the site effect at each station using H/V method of Nakamura (1988) (Fig. 5).
Corresponding Author: Mohan, K.; Institute of Seismological Research, Raisan, Gandhinagar, 382009 Gujarat, India; email: kapil_geo@yahoo.co.in
Appears in Collections:Journal Publications [ES]

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