caa a22 4500 606149252 CHVBK 20210128100533.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1007/s00531-014-1128-0 doi (NATIONALLICENCE)springer-10.1007/s00531-014-1128-0 Investigations related to scientific deep drilling to study reservoir-triggered earthquakes at Koyna, India [Elektronische Daten] [Harsh Gupta, N. Purnachandra Rao, Sukanta Roy, Kusumita Arora, V. Tiwari, Prasanta Patro, H. Satyanarayana, D. Shashidhar, K. Mallika, Vyasulu Akkiraju, Deepjyoti Goswami, Digant Vyas, G. Ravi, K. Srinivas, M. Srihari, S. Mishra, C. Dubey, D. Raju, Ujjal Borah, K. Chinna Reddy, Narendra Babu, Sunil Rohilla, Upasana Dhar, Mrinal Sen, Y. Bhaskar Rao, B. Bansal, Shailesh Nayak] Artificial water reservoir-triggered earthquakes have continued at Koyna in the Deccan Traps province, India, since the impoundment of the Shivaji Sagar reservoir in 1962. Existing models, to comprehend the genesis of triggered earthquakes, suffer from lack of observations in the near field. To investigate further, scientific deep drilling and setting up a fault zone observatory at depth of 5-7km is planned in the Koyna area. Prior to undertaking deep drilling, an exploratory phase of investigations has been launched to constrain subsurface geology, structure and heat flow regime in the area that provide critical inputs for the design of the deep borehole observatory. Two core boreholes drilled to depths of 1,522 and 1,196m have penetrated the Deccan Traps and sampled the granitic basement in the region for the first time. Studies on cores provide new and direct information regarding the thickness of the Deccan Traps, the absence of infra-Trappean sediments and the nature of the underlying basement rocks. Temperatures estimated at a depth of 6km in the area, made on the basis of heat flow and thermal properties data sets, do not exceed 150°C. Low-elevation airborne gravity gradient and magnetic data sets covering 5,012 line km, together with high-quality magnetotelluric data at 100 stations, provide both regional information about the thickness of the Deccan Traps and the occurrence of localized density heterogeneities and anomalous conductive zones in the vicinity of the hypocentral zone. Acquisition of airborne LiDAR data to obtain a high-resolution topographic model of the region has been completed over an area of 1,064km2 centred on the Koyna seismic zone. Seismometers have been deployed in the granitic basement inside two boreholes and are planned in another set of six boreholes to obtain accurate hypocentral locations and constrain the disposition of fault zones. Springer-Verlag Berlin Heidelberg, 2014 Koyna nationallicence Triggered seismicity nationallicence Scientific drilling nationallicence Earthquake nationallicence Reservoir nationallicence Gupta Harsh National Disaster Management Authority, New Delhi, India aut Purnachandra Rao N. CSIR-National Geophysical Research Institute, Hyderabad, India aut Roy Sukanta CSIR-National Geophysical Research Institute, Hyderabad, India aut Arora Kusumita CSIR-National Geophysical Research Institute, Hyderabad, India aut Tiwari V. CSIR-National Geophysical Research Institute, Hyderabad, India aut Patro Prasanta CSIR-National Geophysical Research Institute, Hyderabad, India aut Satyanarayana H. CSIR-National Geophysical Research Institute, Hyderabad, India aut Shashidhar D. CSIR-National Geophysical Research Institute, Hyderabad, India aut Mallika K. CSIR-National Geophysical Research Institute, Hyderabad, India aut Akkiraju Vyasulu CSIR-National Geophysical Research Institute, Hyderabad, India aut Goswami Deepjyoti CSIR-National Geophysical Research Institute, Hyderabad, India aut Vyas Digant CSIR-National Geophysical Research Institute, Hyderabad, India aut Ravi G. CSIR-National Geophysical Research Institute, Hyderabad, India aut Srinivas K. CSIR-National Geophysical Research Institute, Hyderabad, India aut Srihari M. CSIR-National Geophysical Research Institute, Hyderabad, India aut Mishra S. CSIR-National Geophysical Research Institute, Hyderabad, India aut Dubey C. CSIR-National Geophysical Research Institute, Hyderabad, India aut Raju D. CSIR-National Geophysical Research Institute, Hyderabad, India aut Borah Ujjal CSIR-National Geophysical Research Institute, Hyderabad, India aut Chinna Reddy K. CSIR-National Geophysical Research Institute, Hyderabad, India aut Babu Narendra CSIR-National Geophysical Research Institute, Hyderabad, India aut Rohilla Sunil CSIR-National Geophysical Research Institute, Hyderabad, India aut Dhar Upasana CSIR-National Geophysical Research Institute, Hyderabad, India aut Sen Mrinal CSIR-National Geophysical Research Institute, Hyderabad, India aut Bhaskar Rao Y. CSIR-National Geophysical Research Institute, Hyderabad, India aut Bansal B. Ministry of Earth Sciences, New Delhi, India aut Nayak Shailesh Ministry of Earth Sciences, New Delhi, India aut International Journal of Earth Sciences Springer Berlin Heidelberg 104/6(2015-09-01), 1511-1522 1437-3254 104:6<1511 2015 104 531 https://doi.org/10.1007/s00531-014-1128-0 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00531-014-1128-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gupta Harsh National Disaster Management Authority, New Delhi, India aut NATIONALLICENCE 700 1- Purnachandra Rao N. CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Roy Sukanta CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Arora Kusumita CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Tiwari V. CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Patro Prasanta CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Satyanarayana H. CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Shashidhar D. CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Mallika K. CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Akkiraju Vyasulu CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Goswami Deepjyoti CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Vyas Digant CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Ravi G. CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Srinivas K. CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Srihari M. CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Mishra S. CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Dubey C. CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Raju D. CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Borah Ujjal CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Chinna Reddy K. CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Babu Narendra CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Rohilla Sunil CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Dhar Upasana CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Sen Mrinal CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Bhaskar Rao Y. CSIR-National Geophysical Research Institute, Hyderabad, India aut NATIONALLICENCE 700 1- Bansal B. Ministry of Earth Sciences, New Delhi, India aut NATIONALLICENCE 700 1- Nayak Shailesh Ministry of Earth Sciences, New Delhi, India aut NATIONALLICENCE 773 0- International Journal of Earth Sciences Springer Berlin Heidelberg 104/6(2015-09-01), 1511-1522 1437-3254 104:6<1511 2015 104 531