Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...58...35r&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 58, Issue 1, p. 35-43.
Physics
Scientific paper
Seismicity has been monitored since 1981 around two large dams at Nagarjunasagar and Srisailam in the southeastern part of Peninsular India. The two dams are situated within a distance of ~ 60 km from each other on the Krishna River, which flows in the Cuddapah Basin, of Proterozoic age, in the state of Andhra Pradesh. The Nagarjunasagar Dam, of height 125 m and capacity 11.56 km3, started filling in 1968. It was filled to capacity in 1974. The Srisailam Dam, of height 144 m and capacity 8.72 km3, started filling in 1975. It was filled to capacity in 1984. With the help of a local network of five seismic stations, some sporadic weak tremors were located until 1985 around the two reservoirs. These tremors appear to be part of the regional seismicity and not reservoir induced. But during 1986, four weak tremors were located along the Kalawa and Atmakur faults which warrant a close watch. The largest of these, of magnitude 3.2, was felt with intensity IV. The Kalawa and Atmakur faults are situated 20-40 km south of the Srisailam reservoir and are found to be active on the basis of geological evidence collected by the Geological Survey of India. During 1981-1987 more than 100 weak tremors have also been located in the surrounding areas. Seismicity near the dams is described in terms of geology/lineaments. Filling curves of the two reservoirs are also given.
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