Variations in the upper mantle structure as derived fromP n andS n waves
- 20 Downloads
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.
KeywordsNorth America Origin Time Crustal Structure Velocity Ratio Apparent Velocity
Unable to display preview. Download preview PDF.
- 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
- 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
- K. Kaminuma,The crust and upper mantle structure in Japan. Part 2, Bull. Earthq. Res. Inst.44 (1966).Google Scholar
- 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
- 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
- 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