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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/5832
Title: Modeling of strong motion generation area of the Uttarkashi earthquake using modified semiempirical approach
Authors: Sandeep
Joshi A.
Kamal,
Kumar P.
Kumari P.
Published in: Natural Hazards
Abstract: The semiempirical approach based on envelope summation method given by Midorikawa (Tectonophysics 218:287-295, 1993) has been modified in this paper for modeling of strong motion generation areas (SMGAs). Horizontal components of strong ground motion have been simulated using modifications in the semiempirical approach given by Joshi et al. (Nat Hazard 71:587-609, 2014). Various modifications in the technique account for finite rupture source, layering of earth, componentwise division of energy and frequency-dependent radiation pattern. In this paper, SMGAs of the Uttarkashi earthquake have been modeled. Two different isolated wave packets in the recorded accelerogram have been identified from recorded ground motion, which accounts for two different SMGAs in the entire rupture plane. The approximate locations of SMGAs within the rupture plane were estimated using spatio-temporal variation of 77 aftershocks. Source parameters of each SMGA were calculated from theoretical and observed source displacement spectra computed from two different wave packets in the record. The final model of rupture plane responsible for the Uttarkashi earthquake consists of two SMGAs, and the same has been used to simulate horizontal components of acceleration records at different station using modified semiempirical technique. Comparison of the observed and simulated acceleration records in terms of root mean square error confirms the suitability of the final source model for the Uttarkashi earthquake. © 2014 Springer Science+Business Media Dordrecht.
Citation: Natural Hazards (2014), 73(3): 2041-2066
URI: https://doi.org/10.1007/s11069-014-1179-3
http://repository.iitr.ac.in/handle/123456789/5832
Issue Date: 2014
Publisher: Kluwer Academic Publishers
Keywords: 1991 Uttarkashi earthquake
Frequency-dependent radiation pattern
Semiempirical
Strong ground motion
Strong motion generation area
ISSN: 0921030X
Author Scopus IDs: 55914925100
55682260000
55608940500
57192586891
55262299400
Author Affiliations: Sandeep, Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, India
Joshi, A., Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, India
Kamal, Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, India
Kumar, P., Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, India
Kumari, P., Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, India
Corresponding Author: Sandeep; Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, India; email: sandeeparora_geokuk@yahoo.com
Appears in Collections:Journal Publications [ES]

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