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Seasonal variation in the deformation rate in NW Himalayan region

Author

Listed:
  • D. Khandelwal
  • Vineet Gahalaut
  • Naresh Kumar
  • Bhaskar Kundu
  • Rajeev Yadav

Abstract

We report GPS measurements of continuous observations from the multi-parametric geophysical observatory (MPGO) at Ghuttu, Garhwal Lesser Himalaya. Other than the evidence of secular motion depicting strain accumulation due to locking of the underneath seismically active detachment, measurements at Ghuttu show annual variation of ±4 mm on horizontal component. Such variations are more prominent in the north coordinate and do not directly correlate with the meteorological parameters such as variations in rainfall, water table, and atmospheric pressure measured at the MPGO observatory. These variations are also not the artefact of data processing and network. They correlate with the water load storage in the Ganga plains, with minimum in displacement coinciding with the maximum storage of water in Ganga plains immediately after the monsoon and vice versa. Such variations also appear to cause annual variation in the low-magnitude earthquake frequency in the Himalayan region, being relatively more in the winter period. Copyright Springer Science+Business Media Dordrecht 2014

Suggested Citation

  • D. Khandelwal & Vineet Gahalaut & Naresh Kumar & Bhaskar Kundu & Rajeev Yadav, 2014. "Seasonal variation in the deformation rate in NW Himalayan 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. 74(3), pages 1853-1861, December.
    • Handle: RePEc:spr:nathaz:v:74:y:2014:i:3:p:1853-1861
    DOI: 10.1007/s11069-014-1269-2
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    References listed on IDEAS

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    1. Roger Bilham & Kristine Larson & Jeffrey Freymueller, 1997. "GPS measurements of present-day convergence across the Nepal Himalaya," Nature, Nature, vol. 386(6620), pages 61-64, March.
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