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The relative amplitudes of mantle heterogeneity in P velocity, S velocity and density from free-oscillation data

Li, X.-D. and Giardini, D. and Woodhouse, J. H. (1991) The relative amplitudes of mantle heterogeneity in P velocity, S velocity and density from free-oscillation data. Geophysical Journal International, 105 (3). pp. 649-657. ISSN 0956-540X. https://resolver.caltech.edu/CaltechAUTHORS:20170421-085051919

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Abstract

Splitting functions retrieved from spectra of the free oscillations are sensitive to the lateral variations in P velocity (α), S velocity (β), and density (ρ) simultaneously. In this study they are used to constrain the values of the ratios d ln α/d ln β and d ln ρ/d ln α for the lower mantle. Assuming that the upper mantle structure is obtainable from model M84A (this is not a crucial assumption as experiments indicate), the optimal value of d ln α/d ln β inferred from the modal data is 0.44 and d ln α/d ln β lies in the interval (0.39, 0.60) with 75 per cent confidence, strongly discriminating against the value (0.8) often used. The constraints on density structure of the current data are insufficient to yield new definitive results. The analysis demonstrates, however, that the value of d ln ρ/d ln α could be estimated from a larger set of modal data.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1111/j.1365-246X.1991.tb00802.xDOIArticle
https://academic.oup.com/gji/article-lookup/doi/10.1111/j.1365-246X.1991.tb00802.xPublisherArticle
Additional Information:© 1991 RAS. Accepted 1990 December 21. Received 1990 December 10; in original form 1990 February 9. Published: 01 June 1991. We would like to thank A. Morelli and A. M. Dziewonski for allowing us to make use of their unpublished model V.3, and J. H. Woodhouse and A. M. Dziewonski for their unpublished model SW. Discussions with D.-K. Li, on statistics, have been helpful in this study. We also appreciate the thoughtful comments by J. Park, P. Lognonne and an anonymous reviewer of the manuscript. This research was carried out with the support of the National Science Foundation under the grants EAR87-08622 and EAR86-18829.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR87-08622
NSFEAR86-18829
Subject Keywords:free oscillations, mantle heterogeneity, tomography
Issue or Number:3
Record Number:CaltechAUTHORS:20170421-085051919
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170421-085051919
Official Citation:X.-D. Li, D. Giardini, J. H. Woodhouse; The relative amplitudes of mantle heterogeneity in P velocity, S velocity and density from free-oscillation data. Geophys J Int 1991; 105 (3): 649-657. doi: 10.1111/j.1365-246X.1991.tb00802.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76803
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Apr 2017 16:00
Last Modified:03 Oct 2019 17:50

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