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Broad band; surface waves; group velocity; phase velocity

Preliminary analysis of seismograms recorded by a wide band high dynamic range digital seismograph installed under a collaborative research programme between IPG, Paris and NGRI, Hyderabad, indicates that the crust and upper mantle structure below the Indian continent are characterized by high velocity up to a depth of 500 km. Both the group and phase velocities in the period range of 100–350s are found to be faster by 3–4% and 1–3% respectively compared with global models such as the preliminary reference earth model.

C V Ramakrishna Rao¹ V K Gaur²

1. National Geophysical Research Institute, Hyderabad - 500 007, India
2. Department of Ocean Development, Lodi Road, New Delhi - 110 003, India

Published

December 1991

Manuscript received

31 July 1991

Manuscript revised

30 September 1991