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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/6474
Title: A numerical study of effects of ridge-weathering and ridge-shape-ratio on the ground motion characteristics
Authors: Narayan J.P.
Kumar V.
Published in: Journal of Seismology
Abstract: This paper presents the combined effects of ridge-weathering and ridge-shape-ratio on the ground motion amplification and differential ground motion (DGM) along the ridge-flanks. Forth-order-accurate staggered-grid finite-difference (FD) programs have been used for the simulation of SH-wave and P-SV wave viscoelastic responses of various ridge-models. The incorporation of realistic damping in the time-domain FD simulation is based on the GMB-EK rheological model (Emmerich and Korn Geophys 52:1252–1264, 1987). An increase of average spectral amplification (ASA) of the SH-wave with an increase of the shape-ratio was obtained in both the cases of weathered and non-weathered ridges. However, in case of the SV-wave, a decrease of ASA with an increase of shape-ratio was obtained in both the cases of weathered and non-weathered ridges, except in the vertical component of the non-weathered ridge-models. It is concluded that the overall amplification of the SV-wave is larger than the SH-wave in both the cases of the weathered and non-weathered ridge-models. This finding corroborates with the presumption of Geli et al. (Bull Seism Soc Am 78:42–63, 1988). An increase of DGM developed by the SH-wave on the non-weathered ridge-models with an increase of shape-ratio was obtained but reverse was the case on the weathered ridge-models. But, in case of the P-SV wave, there is decrease of DGM with an increase of shape-ratio in both the weathered and non-weathered ridge-models. Further, the largest DGM was very near the base of the weathered ridges in both the SH- and P-SV wave cases. Based on the analysis of ASA and DGM, it may be concluded that the damage on a weathered ridge can be more than that on the non-weathered ridge. Further, if there is matching of wavelength causing largest DGM with the size of structures, it may cause more damage near the base of a weathered ridge. © 2014, Springer Science+Business Media Dordrecht.
Citation: Journal of Seismology (2015), 19(1): 83-104
URI: https://doi.org/10.1007/s10950-014-9452-1
http://repository.iitr.ac.in/handle/123456789/6474
Issue Date: 2015
Publisher: Kluwer Academic Publishers
Keywords: Finite-difference method
Ridge-shape-ratio effects and local site effects
Ridge-weathering effects
Simulation of viscoelastic seismic response
ISSN: 13834649
Author Scopus IDs: 56240931000
57211183150
Author Affiliations: Narayan, J.P., Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Kumar, V., Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Corresponding Author: Narayan, J.P.; Department of Earthquake Engineering, Indian Institute of Technology RoorkeeIndia
Appears in Collections:Journal Publications [EQ]

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