Abstract

Sushil Kumar1*, R. Chander2 and K. N. Khattri3

The 22 Hindu Kush earthquakes had focal depths in the range of 50 to 245 km approximately. The 154 P travel time readings obtained from them were interpreted using a computer program based on least squared inversion and written specifically for the purpose. The upper mantle P- wave velocity along the north-west Himalaya obtained from this study has a value of 8.1 km/s. It appear to persist up to a depth of about 100 km below that level, it appears to increase to 8.35 km/s. The upper mantle P- wave velocity is found to be comparable to that obtained along a DSS profile in Kashmir. However, it is lower by 0.35 km/s from the value estimated by Ni and Barazangi in 1982.