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Title: Assessment of seismic hazard in Uttarakhand Himalaya
Authors: Kumar, Prabhat
Kumar, Ashwani
Sinvhal, Amita
Keywords: Himalaya
zoning map
Issue Date: 2011
Publisher: Department of Earthquake Engineering,IIT Roorkee
Abstract: For a state like Uttarakhand that is located in the seismically active Himalayan region, and in the vicinity of plate boundaries, estimation of seismic hazard and preparation of a zoning map are an urgent necessity. 32 potential seismo tectonic source zones were identified in a very wide area in and around the state, on the basis of seismicity and tectonics, and the longer ones were segmented. Maximum magnitude that each seismo tectonic source zone can support was then estimated. Seismic hazard due to each seismo tectonic source zone was assessed at 180 sites, in terms of Peak Ground Acceleration (PGA). The maximum PGA at each site varied between 0.06g and 0.50g. Seismic hazard was highest around the Main Central Thrust and the Main Boundary Thrust, and several thrusts which were between these two thrusts. This assessment was adapted to make a seismic zoning map of Uttarakhand, with 5 distinct zones. If seismo tectonic source zones from the contiguous regions of Nepal and Tibet were included as part of this assessment, then higher hazard would be expected in Uttarakhand. Threat perceptions of a potential disaster can be assessed in this zoning map. Disaster mitigation strategies will vary geographically, with priorities defined by the zonation map presented here. The methodology evolved has the potential to be extended to other vulnerable states in the Himalayan arc. Post earthquake recovery costs will reduce. Long-term earthquake preparedness and short-term action plan for disaster management can be developed for the entire state.
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