Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Ramesh Chander ¹

Affiliations
1 Department of Earth Sciences, University of Roorkee, Roorkee, 247667, IN

Abstract

Richter estimated from analyses of P arrival times on available seismograms that the epicentre of the 1905 Kangra earthquake lay on the border of Jammu-Kashmir and Himachal Pradesh, approximately 100krn north of Kangra. This point lies far outside the limits of rupture deduced from analyses of macroseismic effects of the earthquake. We apply the concept of rupture propagation to suggest that the Kangra earthquake epicentre was in the southeastern part of the mcsoseismal area in the Chakraia-Mussoorie sector of the Lesser Himalaya near 31° N, 78° E.

Full Text

     

Ramesh Chander ¹, Irene Sarkar ¹

Affiliations
1 Department of Earth Sciences, University of Roorkee, Roorkee 247667, IN

Abstract

The Tarbela reservoir is situated on the lndus river in the Pakistan Himalaya. A telemetred seismic network has been in operation around the reservoir site since 1973, about a year prior to its initial impoundment. Recently, a detailed statistical investigation of post-impoundment seismicity around this rcservoir for a period of seven years has been reported in the literature. Evidence has been presented there for relatively high probability of increased microearthquake activity at shallow depths in the crust beneath the Tarbela reservoir during periods of low water levels. We argue that, although this is important evidence on the question of whether reservoir induced seismicity can occur in the Himalaya, there is need for further detailed seismicity observations around the present and future reservoir sites in these mountains.

Keywords

Dams, Reservoirs, Induced Seismicity, Microearthquakes, Himalaya.

Full Text