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.
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Acknowledgments
Dr. S. S. Chandrasekaran thanks Department of Science and Technology (DST-NRDMS Division), Government of India, New Delhi, for sponsoring the study reported in this paper through the project “Geotechnical Investigation on Landslide in Nilgiris district of Tamilnadu” (Project sanction order NRDMS/11/2003/012 dt: 25/09/2014).
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Elayaraja, S., Chandrasekaran, S.S. & Ganapathy, G.P. Evaluation of seismic hazard and potential of earthquake-induced landslides of the Nilgiris, India. Nat Hazards 78, 1997–2015 (2015). https://doi.org/10.1007/s11069-015-1816-5
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DOI: https://doi.org/10.1007/s11069-015-1816-5