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    • Keywords


      GPS measurements; crustal deformation; Nepal earthquake; post-seismic deformation.

    • Abstract


      Transients in GPS time series can occur due to post-seismic deformation, seasonal hydrological loads, sea-level changes, flood and drought conditions, excessive groundwater withdrawal and recharge, etc. We report two new cases where the application of external loading, namely, earthquake loading and surface loading due to impoundment of hydroelectric reservoir, probably altered the local hydrological conditions to cause anomalous transients in the surface displacement. In the first case, moderate shaking due to the 2015 Gorkha earthquake at Patna (Bihar, India) caused transients in ground deformation in the following 50–60 days of the earthquake which are recorded by a continuous GPS site at Patna. In the second case, impoundment of the Tehri reservoir and its seasonal variations in the Garhwal Himalaya probably altered the local hydrological conditions which is causing anomalous biannual cyclic deformation at a site KUNR, near the reservoir.

    • Author Affiliations


      Sandeep Gupta1 Paresh Nath Singharoy2 Rajeev Kumar Yadav3 Joshi K Catherine4 Roland Burgmann5 Vineet K Gahalaut4 6

      1. Department of Applied Geophysics, Indian School of Mines, Dhanbad 826 004, India.
      2. Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, India.
      3. Institute of Seismological Research, Raisan, Gandhinagar, India.
      4. CSIR–National Geophysical Research Institute, Hyderabad, India.
      5. Department of Earth and Planetary Science, University of California, Berkeley, USA.
      6. National Centre for Seismology, Ministry of Earth Sciences, New Delhi, India.
    • Dates

  • Journal of Earth System Science | News

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      Posted on July 25, 2019

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