Borehole Seismic Network at Koyna, India

Abstract

Research Article| March 16, 2016 Borehole Seismic Network at Koyna, India D. Shashidhar; D. Shashidhar aSeismology Division, Council of Scientific and Industrial Research‐National Geophysical Research Institute (CSIR‐NGRI), Cyber Building, Uppal Road, Hyderabad, Telangana 500007, Indiashashi.geo@gmail.com Search for other works by this author on: GSW Google Scholar H. V. S. Satyanarayana; H. V. S. Satyanarayana aSeismology Division, Council of Scientific and Industrial Research‐National Geophysical Research Institute (CSIR‐NGRI), Cyber Building, Uppal Road, Hyderabad, Telangana 500007, Indiashashi.geo@gmail.com Search for other works by this author on: GSW Google Scholar C. R. Mahato; C. R. Mahato aSeismology Division, Council of Scientific and Industrial Research‐National Geophysical Research Institute (CSIR‐NGRI), Cyber Building, Uppal Road, Hyderabad, Telangana 500007, Indiashashi.geo@gmail.com Search for other works by this author on: GSW Google Scholar K. Mallika; K. Mallika aSeismology Division, Council of Scientific and Industrial Research‐National Geophysical Research Institute (CSIR‐NGRI), Cyber Building, Uppal Road, Hyderabad, Telangana 500007, Indiashashi.geo@gmail.com Search for other works by this author on: GSW Google Scholar N. Purnachandra Rao; N. Purnachandra Rao aSeismology Division, Council of Scientific and Industrial Research‐National Geophysical Research Institute (CSIR‐NGRI), Cyber Building, Uppal Road, Hyderabad, Telangana 500007, Indiashashi.geo@gmail.com Search for other works by this author on: GSW Google Scholar Harsh K. Gupta Harsh K. Gupta aSeismology Division, Council of Scientific and Industrial Research‐National Geophysical Research Institute (CSIR‐NGRI), Cyber Building, Uppal Road, Hyderabad, Telangana 500007, Indiashashi.geo@gmail.com Search for other works by this author on: GSW Google Scholar Author and Article Information D. Shashidhar aSeismology Division, Council of Scientific and Industrial Research‐National Geophysical Research Institute (CSIR‐NGRI), Cyber Building, Uppal Road, Hyderabad, Telangana 500007, Indiashashi.geo@gmail.com H. V. S. Satyanarayana aSeismology Division, Council of Scientific and Industrial Research‐National Geophysical Research Institute (CSIR‐NGRI), Cyber Building, Uppal Road, Hyderabad, Telangana 500007, Indiashashi.geo@gmail.com C. R. Mahato aSeismology Division, Council of Scientific and Industrial Research‐National Geophysical Research Institute (CSIR‐NGRI), Cyber Building, Uppal Road, Hyderabad, Telangana 500007, Indiashashi.geo@gmail.com K. Mallika aSeismology Division, Council of Scientific and Industrial Research‐National Geophysical Research Institute (CSIR‐NGRI), Cyber Building, Uppal Road, Hyderabad, Telangana 500007, Indiashashi.geo@gmail.com N. Purnachandra Rao aSeismology Division, Council of Scientific and Industrial Research‐National Geophysical Research Institute (CSIR‐NGRI), Cyber Building, Uppal Road, Hyderabad, Telangana 500007, Indiashashi.geo@gmail.com Harsh K. Gupta aSeismology Division, Council of Scientific and Industrial Research‐National Geophysical Research Institute (CSIR‐NGRI), Cyber Building, Uppal Road, Hyderabad, Telangana 500007, Indiashashi.geo@gmail.com Publisher: Seismological Society of America First Online: 14 Jul 2017 Online Issn: 1938-2057 Print Issn: 0895-0695 © 2016 by the Seismological Society of America Seismological Research Letters (2016) 87 (3): 661–667. https://doi.org/10.1785/0220150210 Article history First Online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation D. Shashidhar, H. V. S. Satyanarayana, C. R. Mahato, K. Mallika, N. Purnachandra Rao, Harsh K. Gupta; Borehole Seismic Network at Koyna, India. Seismological Research Letters 2016;; 87 (3): 661–667. doi: https://doi.org/10.1785/0220150210 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 SocietySeismological Research Letters Search Advanced Search ABSTRACT The Koyna region located near the west coast of India has been continuously having artificial water‐reservoir‐triggered earthquakes since the impoundment of Koyna Dam in 1962. To improve the accuracy of locations of these triggered earthquakes, a unique network of eight borehole seismometers surrounding the seismicity was designed. Five of these have been installed at depths varying from 1134 to 1522 m, well below the Deccan basalt cover. As it is difficult to install the borehole seismometers with desired orientation of the horizontal components, amplitudes of P waves were used to decipher the true orientations after installation. Analysis of data for the period March–June 2015 demonstrated that there is a remarkable increase in the number of earthquakes located with the help of borehole seismometers. Using the existing network of 21 broadband surface seismometers, 184 earthquakes of ML≥0.5 were located; however, with the borehole seismometers, the number of the located events increased to 888 such events. The data also indicate an increase in seismic activity corresponding to the period of increase in the rate of emptying of the Koyna and Warna reservoirs. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.