Microearthquakes near Osmansagar reservoir, Hyderabad, India

Details Microearthquakes near Osmansagar reservoir, Hyderabad, India Microearthquakes near Osmansagar reservoir, Hyderabad, India

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pepi...44..134r&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 44, Issue 2, p. 134-141.

Physics

5

Scientific paper

Microearthquake activity, starting from January 14, 1982, occurred for 5 weeks, adjacent to a small reservoir 20 km west of Hyderabad. The first event felt in the area was also the largest having an ML magnitude of 3.5. This was the first event recorded at Hyderabad seismic station from such a close distance. There is also no historical record of any event occurring in the area. This as well as other events were felt with a strong explosive sound. A local network of four to five microearthquake recorders was deployed. The epicentres of 106 aftershocks were located to be within an area of about 2 km × 4 km, with focal depths within 1.5 km. Two trends are apparent in NNE and WNW directions. The former matches with a fault, and the latter with a lineament. These are the only two known geological features in the area. The prominent joint directions mapped in the granite country rock are also nearly in these directions. The seismic activity is speculated to be due to the failure of pre-existing joints or fractures. The stresses are likely to be a part of the general northward compression due to the northward movement of the Indian plate. Large time gap (62 y) between initial filling and seismicity as well as faster decay of aftershocks do not suggest that the seismicity was reservoir induced. The foreshock-aftershock pattern and b-value indicate the possibility that the seismicity may be somewhat affected by the reservoir water. Indication of the presence of reservoir water in the wells of the epicentral area is reported from hydrogen isotope studies.
Present address: Centre for Earth Science Studies, Trivandrum, India.

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