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Journal of the Geological Society of India

, Volume 90, Issue 6, pp 670–677 | Cite as

Lineament fabric from airborne LiDAR and its influence on triggered earthquakes in the Koyna-Warna region, western India

  • Kusumita Arora
  • R. K. Chadha
  • Y. Srinu
  • Adrien Selles
  • Srinagesh Davuluri
  • Vladimir Smirnov
  • Alexander Ponomarev
  • V. O. Mikhailov
Article

Abstract

We present the results of the first airborne LiDAR survey flown in the Koyna-Warna region and examine the relationship between the lineament fabric and the ongoing seismicity in the region. Our studies reveal that earthquakes of M≥4.0 for the period 1968 to 2016 are strongly correlated with a 10 km wide N-S fracture zone, which not only represents the surface expression of seismically active basement faults, but also act as conduits for water percolation between the Koyna and Warna reservoirs. A decreasing trend in the annual distribution of earthquakes was observed from 1985. A new burst of seismic activity in 1993 followed the impoudment of the Warna reservoir. We report a change in annual seismicity pattern, where seismicity peaks during September and December in the pre-Warna period, with a new peak emerging during March-April subsequent to the impoundment of Warna reservoir. A model is proposed to explain the seismicity along dominant N-S lineaments and the impact of Warna reservoir impounding which altered the hydrogeologic regime in the region.

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Copyright information

© Geological Society of India 2017

Authors and Affiliations

  • Kusumita Arora
    • 1
  • R. K. Chadha
    • 1
  • Y. Srinu
    • 1
  • Adrien Selles
    • 2
  • Srinagesh Davuluri
    • 1
  • Vladimir Smirnov
    • 3
  • Alexander Ponomarev
    • 3
  • V. O. Mikhailov
    • 3
  1. 1.CSIR-National Geophysical Research InstituteHyderabadIndia
  2. 2.BRGM, D3E/NRE Unit, Indo-French Centre for Groundwater ResearchCSIR-NGRIHyderabadIndia
  3. 3.Schmidt Institute of the Physics of the Earth RASMoscowRussia

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