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    • Preliminary results from very long period data collected by a broad band digital seismic station

      C V Ramakrishna Rao V K Gaur

      Volume 100 Issue 4 December 1991 pp 369-378

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/100/04/0369-0378

    • Keywords

       

      Broad band; surface waves; group velocity; phase velocity

    • 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.

    • Author Affiliations

       

      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

    • Dates

       
      Published
      December 1991
      Manuscript received
      31 July 1991
      Manuscript revised
      30 September 1991

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