Great-circle Rayleigh wave attenuation and group velocity, Part IV: Regionalization and pure-path models for shear velocity and attenuation

Details Great-circle Rayleigh wave attenuation and group velocity, Part IV: Regionalization and pure-path models for shear velocity and attenuation Great-circle Rayleigh wave attenuation and group velocity, Part IV: Regionalization and pure-path models for shear velocity and attenuation

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pepi...17..323m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 17, Issue 4, p. 323-352.

Physics

8

Scientific paper

Pure-path averages for group velocities and specific attenuation have been calculated from individual observations and from path averages for two regionalizations; one original to this study and the other previously devised by Wu. Both are based on four upper-mantle provinces: ocean basin, continent, island arc and mid-ocean ridge. Pure-path group velocities and specific attenuation have also been calculated for combinations of regions and provide well separated regional measurements for such composite regions. Shear-velocity models for pure and combined regions have been derived by a controlled Monte Carlo inversion procedure and indicates that a low-velocity zone is required beneath the oceans, but is not required beneath continents. Models have been produced for pure and combined ocean, ocean-ridge, continent and continent-arc provinces. Q-1R determined from pure-path average group velocities and attenuation coefficients has been regionalized successfully for 2- and 3-region combinations. The resulting pure-path Q-1R for continents is much lower than that for ocean basins and ocean-ridge provinces. Inversion of Q-1R for ocean-ridge provinces shows that the average Qβ for the upper 200 km of these regions is between 85 and 100. Now at University of California, Lawrence Livermore Laboratory, Livermore, CA 94550, U.S.A.

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