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Earth Structure from Free Oscillations and Travel Times

Jordan, Thomas H. and Anderson, Don L. (1973) Earth Structure from Free Oscillations and Travel Times. Geophysical Journal of the Royal Astronomical Society, 35 (1-3). pp. 362-365. ISSN 0016-8009.

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An extensive set of reliable gross Earth data has been inverted to obtain a new estimate of the radial variations of seismic velocities and density in the Earth. The basic data set includes the observed mass and moment of inertia, the averaged periods of free oscillation, and five new sets of differential travel-time data. The eigenperiod data was drawn mainly from the Dziewonski-Gilbert study. The differential travel-time data consists of the times of PcP-P, ScS-S, P_(AB)'-P_(DF)' and P_(BC)'-P_(DF)'. These data were inverted using the linear estimation algorithm described by Jordan (PhD Thesis, California Institute of Technology, 1972). A simple but realistic starting model was constructed based on a number of physical assumptions, such as requiring the Adams-Williamson relation to hold in the lower mantle and core. By using baselifie-insensitive differential travel times and averaged eigenperiods, a considerable improvement in both the quality of the fit and the resolving power has been realized. The spheroidal and torodial data are fit on the average to 0.04 and 0.08 per cent, respectively. The final model, designated model B1, also agrees with Rayleigh and Love wave phase and group velocity data.

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Additional Information:© 1973 Royal Astronomical Society.
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Caltech Division of Geological and Planetary Sciences2279
Issue or Number:1-3
Record Number:CaltechAUTHORS:20150407-112143304
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56426
Deposited By: Tony Diaz
Deposited On:07 Apr 2015 21:41
Last Modified:03 Oct 2019 08:13

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