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Assessment of predominant frequencies using ambient vibration in the Kachchh region of western India: implications for earthquake hazards

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  • A. Singh
  • N. Annam
  • Santosh Kumar

Abstract

The Kachchh region is the second most seismically active region in India after the Himalaya. One of the disastrous Indian earthquakes of the millennium was the Bhuj earthquake of January 26, 2001, which caused about 14,000 casualties and huge property damage. The main reason for such devastation is due to lack of earthquake awareness and poor construction practices. Hence, an increase in the knowledge and awareness, based on improved seismic hazard assessment, is required to mitigate damage due to an earthquake. Natural predominant ground frequencies have been investigated in the Kachchh region of western India using ambient vibrations. The horizontal-to-vertical spectral ratio technique has been applied to estimate the predominant frequency at 126 sites. The ambient vibration measurements were conducted for about 1 h at each site in the continuous mode recording at 100 samples/s. We have validated the estimated predominant frequency with earthquake data recorded at six broadband stations in the region. It has been observed that geological time period has a significant effect on predominant frequency of the ground. The estimated predominant frequencies vary from 0.24 to 2.25 Hz for the Quaternary, 0.41–2.34 Hz for the Tertiary, 0.32–4.91 Hz for the Cretaceous, and 0.39–8.0 Hz for the Jurassic/Mesozoic. In the Deccan trap, it varies from 1.30 to 3.80 Hz. We found distinct variation of predominant frequencies of sites associated with hard rock and soft soil. The predominant frequencies were related to the thickness of the sediments, which are deduced by other geophysical and geological methods in the region. Our results suggest that frequencies of the region reveals the site characteristics that can be considered for studying the seismic risks to evolve a plan for disaster risk mitigation for the region. Copyright Springer Science+Business Media Dordrecht 2014

Suggested Citation

  • 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.
  • Handle: RePEc:spr:nathaz:v:73:y:2014:i:3:p:1291-1309
    DOI: 10.1007/s11069-014-1135-2
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    References listed on IDEAS

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    1. Sumer Chopra & Dinesh Kumar & B. Rastogi & Pallabee Choudhury & R. Yadav, 2013. "Estimation of site amplification functions in Gujarat 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. 65(2), pages 1135-1155, January.
    2. G. Surve & G. Mohan, 2010. "Site response studies in Mumbai using (H/V) Nakamura technique," 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. 54(3), pages 783-795, September.
    3. Jaykumar Shukla & Deepankar Choudhury, 2012. "Seismic hazard and site-specific ground motion for typical ports of Gujarat," 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. 60(2), pages 541-565, January.
    4. A. Singh & O. Mishra & B. Rastogi & Dinesh Kumar, 2011. "3-D seismic structure of the Kachchh, Gujarat, and its implications for the earthquake hazard mitigation," 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. 57(1), pages 83-105, April.
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    Cited by:

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    2. 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.
    3. Raed Ali Ahmad, 2016. "Seismic microzonation map of Syria using topographic slope and characteristics of surface soil," 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. 80(2), pages 1323-1347, January.
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