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Estimation of site amplification functions for the National Capital (Delhi) Region, India

Author

Listed:
  • Manisha Sandhu

    (Kurukshetra University)

  • Dinesh Kumar

    (Kurukshetra University)

  • S. S. Teotia

    (Kurukshetra University)

Abstract

The site amplification functions at 48 sites of NCR have been estimated in this study using the waveforms of locally recorded 23 earthquakes. Due to the absence of a suitable reference site in the region, the widely used horizontal-to-vertical spectral ratio (HVSR) technique has been used for this purpose. The maps showing the spatial distribution of predominant frequencies and the site amplifications at different frequencies corresponding to the natural frequencies of the different-storey buildings have been presented. The predominant frequencies in general are found to be in the range 2.5–7.5 Hz with an average of 4.4 Hz for the region having older alluvium sediments and in the range 1.1–6.4 Hz with an average of 3.3 Hz for the region with the younger alluvium deposits. The average value of the site amplifications for the frequency band 3.0–10.0 Hz is in the range 2.0–5.3 for the sites with significant soil cover, while the spectral amplification corresponding to the predominant frequency varies from 2.5 to 7.5 at most of the sites. The spectral amplification level lies in the range 2.0–3.0 for the sites with less or no sediment cover. The spectral amplification levels presented for the different-storey buildings may be used for the mitigation of seismic hazard in the region. The estimated site amplification functions may be used in the simulation of the site-specific strong ground motions and therefore useful for the evaluation of seismic hazard of a region.

Suggested Citation

  • Manisha Sandhu & Dinesh Kumar & S. S. Teotia, 2017. "Estimation of site amplification functions for the National Capital (Delhi) Region, India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 85(1), pages 171-195, January.
    • Handle: RePEc:spr:nathaz:v:85:y:2017:i:1:d:10.1007_s11069-016-2572-x
    DOI: 10.1007/s11069-016-2572-x
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    References listed on IDEAS

    as
    1. Dinesh Kumar & Irene Sarkar & V. Sriram & S. Teotia, 2012. "Evaluating the seismic hazard to the National Capital (Delhi) Region, India, from moderate earthquakes using simulated accelerograms," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 61(2), pages 481-500, March.
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    Cited by:

    1. Manisha Sandhu & Babita Sharma & Himanshu Mittal & R. B. S. Yadav & Dinesh Kumar & S. S. Teotia, 2020. "Simulation of strong ground motion due to active Sohna fault in Delhi, National Capital Region (NCR) of India: an implication for imminent plausible seismic hazard," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 104(3), pages 2389-2408, December.
    2. Saikat Kuili & Ravi S. Jakka, 2023. "Reliable assessment of seismic site class using stochastic approaches," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 118(3), pages 2419-2458, September.
    3. Anjali Sharma & Renu Yadav & Dinesh Kumar & Ajay Paul & S. S. Teotia, 2021. "Estimation of site response functions for the central seismic gap of Himalaya, India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 109(2), pages 1899-1933, November.

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    1. Manisha Sandhu & Babita Sharma & Himanshu Mittal & R. B. S. Yadav & Dinesh Kumar & S. S. Teotia, 2020. "Simulation of strong ground motion due to active Sohna fault in Delhi, National Capital Region (NCR) of India: an implication for imminent plausible seismic hazard," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 104(3), pages 2389-2408, December.

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