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P- andS-wave travel-time curves from andaman sea earthquakes and inferred upper mantle velocities in the bay of bengal region

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Summary

P- andS-wave travel times of 56 shallow earthquakes with their epicentres in and around the Andaman Sea, as recorded by the Indian Seismological Observatories situated at Madras, Visakhapatnam, Calcutta and Port Blair, have been analysed statistically. The travel times from Δ=1 ° to 17 ° can be represented by one straight-line segment. When epicentres of all the earthquakes are considered, scatter in the travel-time data is greater and the corresponding apparentP- andS-wave velocities have been found to be 8.56±0.20 km/sec and 4.84±0.36 km/sec respectively. On the other hand, if epicentres of the narrow seismic zone situated along the western border of the Andaman Sea alone are considered, the apparentP- andS-wave velocities have been found to be 8.24±0.09 km/sec and 4.74±0.10 km/sec respectively. The O-JB residuals are found to be consistently negative for the second set of epicentres which is indicative of an inclined Mohorovicic discontinuity in the Bay of Bengal region.

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References

  1. Leg 22, Geotimes17 (6) (1972), 15.

  2. B. C. Heezen andM. Tharp, Bulletin of the Geological Society of America (1965).

  3. J. R. Curray andD. G. Moore, Bulletin of the Geological Society of America82 (1971), 563–572.

    Google Scholar 

  4. M. Ewing, S. Eittreim, M. Truchan andJ. Ewing, Deep Sea Research16 (1969), 231–248.

    Google Scholar 

  5. Hari Narain, K. L. Kaila andR. K. Verma, Canadian Journal of Earth Sciences5 (1968), 1051–1065.

    Google Scholar 

  6. D. Das, K. G. C. Rao andA. L. Roy,Proceedings of Second Upper Mantle Project Symposium, 28–31 Dec. 1970, Hyderabad (1970), p. 39.

  7. C. Karunakaran, K. K. Roy andS. S. Saha,22nd International Geological Congress, India, Section 4 (1964), p. 45.

  8. G. Peter, L. A. Weeks andR. E. Burns, Journal of Geophysical Research71 (2) (1966), 495–509.

    Google Scholar 

  9. Sir Harold Jeffreys,The Earth — Its Origin, History and Physical Constitution (University Press, Cambridge 1959), p. 1125.

    Google Scholar 

  10. R. W. Raitt, Bulletin of the Geological Society of America67 (1956), 1623–1639.

    Google Scholar 

  11. Martin H. P. Bott,The Interior of the Earth (Edward Arnold Ltd., London 1971), p. 72.

    Google Scholar 

  12. T. Santo, Bulletin of the Earthquake Research Institute47 (1969), 1049–1061.

    Google Scholar 

  13. M. N. Hill, Physics and Chemistry of the Earth2 (1957), 129–163.

    Google Scholar 

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Authors and Affiliations

  1. Department of Geophysics, Andhra University, Waltair, India

    T. K. S. Prakasa Rao & D. S. Sundara Rao

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  1. T. K. S. Prakasa Rao
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  2. D. S. Sundara Rao
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Prakasa Rao, T.K.S., Sundara Rao, D.S. P- andS-wave travel-time curves from andaman sea earthquakes and inferred upper mantle velocities in the bay of bengal region. PAGEOPH 112, 395–402 (1974). https://doi.org/10.1007/BF00876149

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