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Seismicity and reservoir induced crustal motion study around the Tehri Dam, India

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Abstract

The Tehri Dam is located in a seismotectonically active region in the Indian Himalayan belt. This 260.5 m high dam has a live water storage of 2615 × 106 m3 and is capable of generating crustal deformation corresponding to water fluctuation. Filling of the reservoir started in October 2005. Seismic data around the dam between 2000 and 2010 shows that seismicity is corresponding to drawdown levels of the reservoir rather than to higher water levels. GPS data at twelve local benchmarks were collected from 2006 to 2008 during filling and drawdown reservoir levels. The velocity vectors show ground motion to be between ∼0.69–1.50 mm in the different filling-drawdown cycles with reference to the permanent station at Ghuttu. The motion appears to be inwards into the reservoir when the reservoir is filled and outwards when the reservoir is drained. This ground motion corresponds to elastic deformation and rebound due to effect of the oscillating water levels.

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Authors and Affiliations

  1. Wadia Institute of Himalayan Geology, Dehradun, India

    Swapnamita Choudhury, Param K. Gautam & Ajay Paul

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  1. Swapnamita Choudhury
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  2. Param K. Gautam
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  3. Ajay Paul
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Correspondence to Swapnamita Choudhury.

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Choudhury, S., Gautam, P.K. & Paul, A. Seismicity and reservoir induced crustal motion study around the Tehri Dam, India. Acta Geophys. 61, 923–934 (2013). https://doi.org/10.2478/s11600-013-0125-1

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  • DOI: https://doi.org/10.2478/s11600-013-0125-1

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