Geodetic Constraints on Tectonic and Anthropogenic Deformation and Seismogenesis of Koyna–Warna Region, India

Abstract

Research Article| September 25, 2018 Geodetic Constraints on Tectonic and Anthropogenic Deformation and Seismogenesis of Koyna–Warna Region, India Vineet K. Gahalaut; Vineet K. Gahalaut aNational Centre for Seismology, Ministry of Earth Sciences, New Delhi 110003, India, [e-mail] Search for other works by this author on: GSW Google Scholar Kalpna Gahalaut; Kalpna Gahalaut bCSIR‐National Geophysical Research Institute, Hyderabad 500007, India Search for other works by this author on: GSW Google Scholar Joshi K. Catherine; Joshi K. Catherine bCSIR‐National Geophysical Research Institute, Hyderabad 500007, India Search for other works by this author on: GSW Google Scholar K. M. Sreejith; K. M. Sreejith cISRO‐Space Applications Centre, Ahmedabad 380015, India Search for other works by this author on: GSW Google Scholar Ritesh Agrawal; Ritesh Agrawal cISRO‐Space Applications Centre, Ahmedabad 380015, India Search for other works by this author on: GSW Google Scholar Rajeev Kumar Yadav; Rajeev Kumar Yadav dDepartment of Earth Sciences, Indian Institute of Technology, Kanpur 208016, India Search for other works by this author on: GSW Google Scholar Ch. Mohanalakshmi; Ch. Mohanalakshmi bCSIR‐National Geophysical Research Institute, Hyderabad 500007, India Search for other works by this author on: GSW Google Scholar M. S. Naidu; M. S. Naidu bCSIR‐National Geophysical Research Institute, Hyderabad 500007, India Search for other works by this author on: GSW Google Scholar V. Rajeshwar Rao V. Rajeshwar Rao bCSIR‐National Geophysical Research Institute, Hyderabad 500007, India Search for other works by this author on: GSW Google Scholar Author and Article Information Vineet K. Gahalaut aNational Centre for Seismology, Ministry of Earth Sciences, New Delhi 110003, India, [e-mail] Kalpna Gahalaut bCSIR‐National Geophysical Research Institute, Hyderabad 500007, India Joshi K. Catherine bCSIR‐National Geophysical Research Institute, Hyderabad 500007, India K. M. Sreejith cISRO‐Space Applications Centre, Ahmedabad 380015, India Ritesh Agrawal cISRO‐Space Applications Centre, Ahmedabad 380015, India Rajeev Kumar Yadav dDepartment of Earth Sciences, Indian Institute of Technology, Kanpur 208016, India Ch. Mohanalakshmi bCSIR‐National Geophysical Research Institute, Hyderabad 500007, India M. S. Naidu bCSIR‐National Geophysical Research Institute, Hyderabad 500007, India V. Rajeshwar Rao bCSIR‐National Geophysical Research Institute, Hyderabad 500007, India Publisher: Seismological Society of America First Online: 25 Sep 2018 Online Issn: 1943-3573 Print Issn: 0037-1106 © Seismological Society of America Bulletin of the Seismological Society of America (2018) 108 (5B): 2933–2942. https://doi.org/10.1785/0120170373 Article history First Online: 25 Sep 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Vineet K. Gahalaut, Kalpna Gahalaut, Joshi K. Catherine, K. M. Sreejith, Ritesh Agrawal, Rajeev Kumar Yadav, Ch. Mohanalakshmi, M. S. Naidu, V. Rajeshwar Rao; Geodetic Constraints on Tectonic and Anthropogenic Deformation and Seismogenesis of Koyna–Warna Region, India. Bulletin of the Seismological Society of America 2018;; 108 (5B): 2933–2942. doi: https://doi.org/10.1785/0120170373 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract Earthquakes in Koyna–Warna region in western India are considered to be triggered by the reservoirs. However, our understanding of the tectonic processes responsible for causing these earthquakes is generally poor. With a view to understand these processes, in the beginning of year 2013 we installed five continuous Global Positioning System (GPS) sites close to the seismic zones of the region, which provide estimates of secular and seasonal deformation. Based on secular tectonic motion at these sites, we propose that the eastern block of Koyna–Warna fault zone probably moves faster (⁠∼0.7 mm/yr⁠) in the northeast direction which may be further confirmed from a better spatial and temporal coverage of GPS measurements and additional geophysical observations. Such anomalous secular motion loads the faults of the Koyna–Warna seismic zones and causes earthquakes with focal mechanisms consistent with this motion. Simulated deformation due to filling and emptying cycles of the reservoirs is consistent with the seasonal deformation obtained from the GPS observations and Interferometric Synthetic Aperture Radar (InSAR) analysis. Such seasonal deformation due to reservoir filling leads to reduction in strength on the faults of the Koyna–Warna seismic zones, thereby triggering of earthquakes on critically stressed faults and modulation of earthquake frequency. 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