Variations in the upper mantle structure as derived fromP
n andS
n waves |
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| Authors: | Vebjørn Fagernes Reidar Kanestrøm |
| |
| Institution: | (1) University of Tromsø, N-9000 Tromsø, Norway;(2) Seismological Observatory, University of Bergen, N-5000 Bergen, Norway |
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| Abstract: | 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. |
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| Keywords: | |
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