Seismic Site Classification of Recording Stations in Tarai Region of Uttarakhand, from Multiple Approaches

Harinarayan, N. H.; Kumar, Abhishek

doi:10.1007/s10706-017-0399-1

Cited by 6 publications

(3 citation statements)

References 35 publications

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“…The highest rate of recurrence of an assigned class at a site by all the four methods is voted for the final classification of that site. Two classification schemes, namely the modified NEHRP scheme (Harinarayan and Kumar, 2018a) in first method and JRA (1980) scheme in second method, have been used to classify the sites. In the present study, the H/V spectral ratio curve for each site class matches well with the standard H/V spectral ratio curves proposed by Zhao et al (2006).…”

Section: Discussionmentioning

confidence: 99%

“…The H/V spectral ratio of FFT was drawn to estimate the predominant period of the site corresponding to the predominant peak of the H/V spectral ratio curve by following the procedure as stated above. Based on the predominant period of a station, the modified NEHRP site classification scheme (Harinarayan and Kumar, 2018a) given in Table 2 is selected to classify the sites into corresponding site classes.…”

Section: H/v Spectral Ratio From Fast Fourier Amplitude Spectrummentioning

confidence: 99%

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Site classification of seismic recording stations of Garhwal region of earthquake early warning system for Uttarakhand, India

Kumar

Pandey

Kamal

et al. 2022

Vietnam J. Earth Sci.

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Site classification is vital to carry out seismic hazard analysis of a region and get the damage patterns caused by earthquakes. In the present study, the ground motion of earthquakes recorded from 2015 to 2019 at 84 sites of the seismic network array of Earthquake Early Warning System for Uttarakhand are analyzed for site classification purposes. The predominant period from the mean horizontal to vertical spectral ratio curves was estimated. The classification schemes devised by Japan Road Association and National Earthquake Hazards Reduction Program are applied to classify the sites. Along with this, two other site classification indexes schemes are also applied for classification purposes. Data winnowing techniques are used over the ground motion records to pick out desirable quality records. Conclusively, the site class with the highest recurrence rate amongst the used methods is selected as the final class for that particular site. The effect of magnitude, distance and depth on horizontal to vertical spectral ratio are described and concluded that these factors do not significantly affect the ratio curves. The average horizontal to vertical spectral ratio curves obtained for all the sites matches well with the existing literature. The classification of a few sites are verified from the classification done by other methods in recent studies. It is evident from the results that the classification done in this study matches well with them.

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Section: Discussionmentioning

confidence: 99%

Section: H/v Spectral Ratio From Fast Fourier Amplitude Spectrummentioning

confidence: 99%

Site classification of seismic recording stations of Garhwal region of earthquake early warning system for Uttarakhand, India

Kumar

Pandey

Kamal

et al. 2022

Vietnam J. Earth Sci.

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“…As highlighted by Kumar et al (2017aKumar et al ( , b, 2018a, Harinarayan and Kumar (2018) the response of same soil will change depending upon the level of shear strains an input motion generates in it. As a result, a soil may undergo large amplification of ground motion when subjected to lower amplitude ground motions.…”

Section: Guwahati and Its Seismicitymentioning

confidence: 99%

Design Response Spectra and Site Coefficients for Various Seismic Site Classes of Guwahati, India, Based on Extensive Ground Response Analyses

Kumar

Suman

2020

Geotech Geol Eng

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Seismicity of northeast India and its surroundings is governed by complex tectonic setting. Guwahati, the largest city of northeast India, had suffered minor to major damages during past earthquakes (EQs). Known seismic source information also suggests that Guwahati is susceptible for future EQs both from nearby as well as distance source. Taking into account the subsoil information of Guwahati, present work attempts to understand the role of Guwahati soil during probable seismic excitation. In the absence of regional ground motion records, covering a possible variation in ground motion characteristics, which can occur during potential future EQ, 30 globally recorded ground motions are used as input motions in this work. Each input motion is applied to each of the 225 boreholes resulting in 225 9 30 = 6750 ground response analyses using equivalent linear approach. Based on the response of subsoil to each input motion, site coefficients as well as average response spectra for various seismic site classes are proposed. It has to be mentioned here that in comparison to previous works which attempted to understand the subsoil of Guwahati based on specific location-based subsoil information and specific scenario EQ, present work provides a broader picture of soil response which can be applied to any level of ground shaking. Further, based on predominant period, suggestion of maximum building storeys are suggested for Guwahati. In addition, based on the work, characteristics of EQ scenario, which can trigger maximum response from local soil of Guwahati, are assessed. Based on the present analyses, design response spectra of Guwahati are also proposed. Keeping in mind Government of India's policy towards the development of northeast India and further to develop Guwahati as ''Smart city'', the present findings will be very useful in city planning, estimation of induced effects as well as for seismic design of probable infrastructure in Guwahati.

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A Comparative Study of Response and Fourier Spectral Ratios on Classifying Sites

Livaoğlu

Şentürk

Sertçelik

2021

Pure Appl. Geophys.

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Seismic Site Classification of Recording Stations in Tarai Region of Uttarakhand, from Multiple Approaches

Cited by 6 publications

References 35 publications

Site classification of seismic recording stations of Garhwal region of earthquake early warning system for Uttarakhand, India

Site classification of seismic recording stations of Garhwal region of earthquake early warning system for Uttarakhand, India

Design Response Spectra and Site Coefficients for Various Seismic Site Classes of Guwahati, India, Based on Extensive Ground Response Analyses

A Comparative Study of Response and Fourier Spectral Ratios on Classifying Sites

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