Preliminary results from very long period data collected by a broad band digital seismic station |
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| Authors: | C V Ramakrishna Rao V K Gaur |
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| Institution: | (1) National Geophysical Research Institute, 500 007 Hyderabad, India;(2) Department of Ocean Development, Lodi Road, 110 003 New Delhi, India |
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| Abstract: | 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. |
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| Keywords: | Broad band surface waves group velocity phase velocity |
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