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A platform for research: civil engineering, architecture and urbanism
A Vertical-to-horizontal spectral ratio model for India
https://orcid.org/0000-0002-5596-9244
Abstract This paper presents the results of a study on the characteristics of vertical-to-horizontal ratio (V/H) of 5% damped acceleration spectra for Indian ground motion records. Preliminary analysis indicates that at least 50% of the records exceed the Indian seismic design code considered norm of 2/3 at both the short and long period ranges. In addition, currently there are no V/H spectral ratio models available for India and the global models do not capture the trend across all the periods efficiently. Therefore, new ground motion models for the V/H spectral ratio are derived for two of the active tectonic regions of India: the Western Himalayas and the North-East India. Moment magnitude, focal depth, distance, site soil class, and focal mechanism are considered while deriving these models for a wide range of spectral periods (0.01–10s). The goodness of these models is verified through comparison with other globally available V/H models.
Highlights New V/H spectral ratio ground motion models for the two most active regions of India-the Western Himalayas (WH) and the North-East India (NE) are derived in the present study. Comparison of estimates from the current model for the 2015 Mw 7.9 Nepal earthquake highlights the goodness of the model at both near and far field sites. Higher short period V/H ratios are observed in the dataset as well as the estimates, which exceed the 2/3rd threshold value proposed by the Indian Seismic code of design IS 1893.
A Vertical-to-horizontal spectral ratio model for India
https://orcid.org/0000-0002-5596-9244
Abstract This paper presents the results of a study on the characteristics of vertical-to-horizontal ratio (V/H) of 5% damped acceleration spectra for Indian ground motion records. Preliminary analysis indicates that at least 50% of the records exceed the Indian seismic design code considered norm of 2/3 at both the short and long period ranges. In addition, currently there are no V/H spectral ratio models available for India and the global models do not capture the trend across all the periods efficiently. Therefore, new ground motion models for the V/H spectral ratio are derived for two of the active tectonic regions of India: the Western Himalayas and the North-East India. Moment magnitude, focal depth, distance, site soil class, and focal mechanism are considered while deriving these models for a wide range of spectral periods (0.01–10s). The goodness of these models is verified through comparison with other globally available V/H models.
Highlights New V/H spectral ratio ground motion models for the two most active regions of India-the Western Himalayas (WH) and the North-East India (NE) are derived in the present study. Comparison of estimates from the current model for the 2015 Mw 7.9 Nepal earthquake highlights the goodness of the model at both near and far field sites. Higher short period V/H ratios are observed in the dataset as well as the estimates, which exceed the 2/3rd threshold value proposed by the Indian Seismic code of design IS 1893.
A Vertical-to-horizontal spectral ratio model for India
https://orcid.org/0000-0002-5596-9244
Abstract This paper presents the results of a study on the characteristics of vertical-to-horizontal ratio (V/H) of 5% damped acceleration spectra for Indian ground motion records. Preliminary analysis indicates that at least 50% of the records exceed the Indian seismic design code considered norm of 2/3 at both the short and long period ranges. In addition, currently there are no V/H spectral ratio models available for India and the global models do not capture the trend across all the periods efficiently. Therefore, new ground motion models for the V/H spectral ratio are derived for two of the active tectonic regions of India: the Western Himalayas and the North-East India. Moment magnitude, focal depth, distance, site soil class, and focal mechanism are considered while deriving these models for a wide range of spectral periods (0.01–10s). The goodness of these models is verified through comparison with other globally available V/H models.
Highlights New V/H spectral ratio ground motion models for the two most active regions of India-the Western Himalayas (WH) and the North-East India (NE) are derived in the present study. Comparison of estimates from the current model for the 2015 Mw 7.9 Nepal earthquake highlights the goodness of the model at both near and far field sites. Higher short period V/H ratios are observed in the dataset as well as the estimates, which exceed the 2/3rd threshold value proposed by the Indian Seismic code of design IS 1893.
A Vertical-to-horizontal spectral ratio model for India
Podili, Bhargavi (author) / Sreejaya, K.P. (author) / Raghukanth, S.T.G. (author) / Srinagesh, D. (author) / Murty, C.V.R. (author)
2021-11-04
Article (Journal)
Electronic Resource
English
Horizontal to vertical spectral ratio and geological conditions
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A Probabilistic Nonparametric Model for the Vertical-to-Horizontal Spectral Ratio
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