Abstract
The state of the art in the geological and geophysical study of the region of Koyna and Warna water reservoirs is reviewed. The probable geodynamical factors of induced seismicity are discussed. The detailed geophysical surveys, satellite geodetic data, and time history of the seismicity in the region reveal a complicated pattern of the structure and recent geodynamics of the region. The existing data suggest that the induced seismicity is here most likely to be caused by the regional (intraplate) stresses driving the displacements along the orthogonal network of the faults whose strength has dropped and continues decreasing due to the reservoir impoundment and operation processes. The evolution of the seismicity which started immediately after the rapid filling of the Koyna reservoir in the region of the dam, then rapidly expanded southwards and eventually became concentrated in the region of the subsequently constructed Warna reservoir shows that seismic events can be initiated by a number of factors whose contributions may vary with time. The key ones among them include reservoir loading and its seasonal variations; water saturation of the faults which guide the propagation of the front of fracture, increased permeability, and, probably, mineral transformations (hydrolysis) under the water level fluctuations in the reservoirs; and displacement of the front of the high pore pressure down to the main source zone of the earthquakes at a depth of 6–8 km. Based on the analysis presented in the paper, we outline the directions of the future research aimed at studying the nature and dynamics of induced seismicity in the region of large water reservoirs.
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Original Russian Text © V.O. Mikhailov, K. Arora, A.V. Ponomarev, D. Srinagesh, V.B. Smirnov, R.K. Chadha, 2017, published in Fizika Zemli, 2017, No. 4, pp. 28–39.
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Mikhailov, V.O., Arora, K., Ponomarev, A.V. et al. Reservoir induced seismicity in the Koyna–Warna region, India: Overview of the recent results and hypotheses. Izv., Phys. Solid Earth 53, 518–529 (2017). https://doi.org/10.1134/S1069351317030041
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DOI: https://doi.org/10.1134/S1069351317030041