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


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.


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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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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