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Evaluation of seismic hazard and potential of earthquake-induced landslides of the Nilgiris, India

Author

Listed:
  • S. Elayaraja
  • S. Chandrasekaran
  • G. Ganapathy

Abstract

The Nilgiris district in the Tamilnadu state of India is frequented by many landslides in the recent past. Though many of these landslides are rainfall-induced, there is a need to evaluate the potential of earthquake-induced landslides considering seismicity of the region. In this paper, deterministic seismic hazard of Nilgiris is carried out by considering a study area of 350 km radius around Nilgiris. Seismotectonic map of the Nilgiris, showing the details of faults and past earthquakes, is prepared. The peak ground acceleration (PGA) at bed rock level and response spectrum are evaluated. The potential sources for Nilgiris are Moyar and Bhavani shears. The PGA at bed rock level is 0.156 g corresponding to maximum considered earthquake 6.8. Ground response analysis for seven sites, in the Nilgiris, is carried out by one-dimensional equivalent linear method using SHAKE 2000 program after considering the effect of topography. PGA of surface motion got amplified to 0.64 g in Coonoor site and 0.44 g in Ooty site compared to 0.39 g of the input motion. The bracketed duration of time history of surface acceleration has increased to 20 s in Coonoor site and 18 s in Ooty site compared to that of 8 s of input motion. Results from seismic displacement analysis using Newmark’s method revealed that out of seven sites investigated, five sites have moderate seismic landslide hazard and two sites (Coonoor and Ooty) have high hazard. Copyright Springer Science+Business Media Dordrecht 2015

Suggested Citation

  • S. Elayaraja & S. Chandrasekaran & G. Ganapathy, 2015. "Evaluation of seismic hazard and potential of earthquake-induced landslides of the Nilgiris, 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. 78(3), pages 1997-2015, September.
    • Handle: RePEc:spr:nathaz:v:78:y:2015:i:3:p:1997-2015
    DOI: 10.1007/s11069-015-1816-5
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    References listed on IDEAS

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    1. M. Budimir & P. Atkinson & H. Lewis, 2014. "Earthquake-and-landslide events are associated with more fatalities than earthquakes alone," 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. 72(2), pages 895-914, June.
    2. T. Sitharam & P. Anbazhagan, 2007. "Seismic Hazard Analysis for the Bangalore Region," 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. 40(2), pages 261-278, February.
    3. Ganapathy Ganapathy & Ajay Rajawat, 2015. "Use of hazard and vulnerability maps for landslide planning scenarios: a case study of the Nilgiris, 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. 77(1), pages 305-316, May.
    4. P. Anbazhagan & J. Vinod & T. Sitharam, 2009. "Probabilistic seismic hazard analysis for Bangalore," 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. 48(2), pages 145-166, February.
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