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pure and applied geophysics

, Volume 109, Issue 1, pp 1762–1772 | Cite as

Variations in the upper mantle structure as derived fromP n andS n waves

  • Vebjørn Fagernes
  • Reidar Kanestrøm
Article

Summary

Observed travel-times ofP n andS n waves are used to determine the ratio ofP n toS n velocities, Poisson’s ratio and the ratio of incompressibility to shear modulus for Europe, Japan, North America and Scandinavia. The analysis of the data reveals that theP n toS n velocity ratio decreases when theP n velocity increases for Scandinavia and North America, while the velocity ratio increases when theP n velocity increases for Europe and Japan.

Keywords

North America Origin Time Crustal Structure Velocity Ratio Apparent Velocity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. [1]
    H. Berckhemer,Seismic anomalies and crustal structure in Germany, Report of VESIAC, 4410-99-X, Inst. Sci. and Tech., Univ. of Michigan (1966).Google Scholar
  2. [2]
    M. Båth,Average crustal structure of Sweden, Pure and Appl. Geophys.88 (1971), 1–28.CrossRefGoogle Scholar
  3. [3]
    E. Herrin andJ. Taggart,Regional variations in P n velocity and their effect on the locations of epicentres, Bull. Seismol. Soc. Am.52 (1962), 1037–1046.Google Scholar
  4. [4]
    K. Kaminuma,The crust and upper mantle structure in Japan. Part 2, Bull. Earthq. Res. Inst.44 (1966).Google Scholar
  5. [5]
    R. Kanestrøm,Application of the phases P n and S n in the determination of the origin time for shallow focus earthquakes, Årb. Univ. Bergen8 (1966), 1–8.Google Scholar
  6. [6]
    R. Kanestrøm,On the seismic phases P n and S n as recorded in Fennoscandia, Pure and Appl. Geophys.97 (1972), 37–43.CrossRefGoogle Scholar
  7. [7]
    R. Kanestrøm andK. Haugland,Profile section 3–4, in Deep Seismic Sounding in Northern Europe, edited byA. Vogel (Swedish Natural Science Research Council, Stockholm 1971), pp. 76–91.Google Scholar
  8. [8]
    M. Kumazawa andO. L. Anderson,Elastic moduli, pressure derivatives, and temperature derivatives of single-crystal forsterite, J. Geophys. Res.74 (1969), 5961–5972.CrossRefGoogle Scholar
  9. [9]
    E. Penttilä,A report summarizing on the velocity of earthquake waves and the structure of the Earth’s crust in the Baltic Shield, Geophysica (Helsinki)10 (1969), 11–23.Google Scholar
  10. [10]
    C. Y. Wang,Density and constitution of the mantle, J. Geophys. Res.75 (1970), 3264–3284.CrossRefGoogle Scholar

Copyright information

© Birkhäuser-Verlag 1973

Authors and Affiliations

  • Vebjørn Fagernes
    • 1
  • Reidar Kanestrøm
    • 2
  1. 1.University of TromsøTromsøNorway
  2. 2.Seismological ObservatoryUniversity of BergenBergenNorway

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