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Microtremor study for evaluating the site response characteristics in the Surat City of western India

Author

Listed:
  • A. P. Singh

    (Institute of Seismological Research)

  • Abhijitsinh Parmar

    (Shankersinh Vaghela Bapu Institute of Technology)

  • Sumer Chopra

    (Institute of Seismological Research)

Abstract

The Surat City, which is the second most populated city in the state of Gujarat in western India, warrants site-specific seismic hazard assessment due to its rapid urbanization and proximity to major seismogenic zones. This study reports results of microtremor investigations at 72 single stations and 4 arrays in an area of 325 km2 spanning the city. The resonant frequencies, associated peak amplification values and liquefaction vulnerability indices were deduced from the horizontal to vertical spectral ratios. Ground amplification (AHVSR) in the range of 3.0–5.0 was observed in the 2.0–4.0-Hz frequency band at most of the sites. A secondary AHVSR between 2.0 and 3.0 is also observed in the 6.0–7.0-Hz frequency band at a few sites. Locales that are most susceptible to liquefaction are identified based on their vulnerability index (K g) exceeding the value of 10. The shear wave velocities (V s) ≥ 500 m/s inferred from array measurements occur at 38 m depth in the western part and ~16 m depth in the eastern part of city. The response spectra estimated from strong motion data recorded at an accelerograph site in Surat from three earthquakes of M w ≥ 3.2 that occurred in Kachchh, Saurashtra and Narmada regions are in accordance with our inferences of characteristic site frequencies and amplification. Our results, in agreement with the damage scenario during the 2001 Bhuj earthquake, provide valuable inputs for site-specific seismic hazard evaluation of the Surat City.

Suggested Citation

  • A. P. Singh & Abhijitsinh Parmar & Sumer Chopra, 2017. "Microtremor study for evaluating the site response characteristics in the Surat City of western 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. 89(3), pages 1145-1166, December.
    • Handle: RePEc:spr:nathaz:v:89:y:2017:i:3:d:10.1007_s11069-017-3012-2
    DOI: 10.1007/s11069-017-3012-2
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    References listed on IDEAS

    as
    1. A. Singh & N. Annam & Santosh Kumar, 2014. "Assessment of predominant frequencies using ambient vibration in the Kachchh region of western India: implications for earthquake hazards," 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. 73(3), pages 1291-1309, September.
    2. A. Singh & Indrajit Roy & Santosh Kumar & J. Kayal, 2015. "Seismic source characteristics in Kachchh and Saurashtra regions of Western India: b-value and fractal dimension mapping of aftershock sequences," 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. 77(1), pages 33-49, May.
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    Cited by:

    1. S. Mohammad Sadegh Sahraeian & Ali Kavand & Abbas Ghalandarzadeh, 2020. "Shear wave velocity profiling by inverse analysis of array microtremors for two cities in Iran: conventional derivative-based versus genetic algorithm inversion methods," 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. 102(1), pages 335-363, May.

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