DOI: 10.1029/gl013i013p01545. Anisotropy of the inner core inferred from <i>PKIKP</i> travel times

Anisotropy of the inner core inferred from PKIKP travel times

10.1029/gl013i013p01545

Crossref journal-article

American Geophysical Union (AGU)

Geophysical Research Letters (13)

Abstract

Travel‐time residuals of the PKIKP phase observed between 170° and 180° show an axisymmetric pattern of degree 2 with an amplitude of about 2 seconds. The effect at shorter distances is much less pronounced and the entire data set cannot be explained by a physically realistic radial distribution of (isotropic) heterogeneity. We propose that, in addition to the general (isotropic) heterogeneity, the inner core is anisotropic with cylindrical symmetry aligned with the earth's rotation axis. Average P‐velocity along this axis is about 1 percent faster than in the equatorial plane.

Bibliography

Morelli, A., Dziewonski, A. M., & Woodhouse, J. H. (1986). Anisotropy of the inner core inferred from PKIKP travel times. Geophysical Research Letters, 13(13), 1545â1548. Portico.

Authors 3

Andrea Morelli (first)
Adam M. Dziewonski (additional)
John H. Woodhouse (additional)

References 15 Referenced 357

10.1111/j.1365-246X.1986.tb04371.x
10.1029/JB091iB07p07485
10.1029/JB089iB07p05929
10.1029/JB088iB04p03295
10.1111/j.1365-246X.1976.tb00271.x
10.1111/j.1365-246X.1974.tb05467.x
10.1038/292232a0
{'key': 'e_1_2_1_9_1', 'article-title': 'Three dimensional structure of the earth from splitting in free oscillation spectra', 'author': 'Giardini D.', 'journal-title': 'Nature'} / Nature / Three dimensional structure of the earth from splitting in free oscillation spectra by Giardini D.
{'key': 'e_1_2_1_10_1', 'first-page': '88', 'article-title': 'P′', 'volume': '14', 'author': 'Lehman I.', 'year': '1936', 'journal-title': 'Travaux Scientifique'} / Travaux Scientifique / P′ by Lehman I. (1936)
{'key': 'e_1_2_1_11_1', 'first-page': '643', 'volume-title': 'A treatise on the mathematical theory of elasticity', 'author': 'Love A. E. H.', 'year': '1927'} / A treatise on the mathematical theory of elasticity by Love A. E. H. (1927)
10.1029/JB088iB02p01235
{'key': 'e_1_2_1_13_1', 'first-page': '975', 'article-title': 'Stability of aspherical models of the lower mantle (abstract)', 'volume': '66', 'author': 'Morelli A.', 'year': '1985', 'journal-title': 'Eos Trans. AGU'} / Eos Trans. AGU / Stability of aspherical models of the lower mantle (abstract) by Morelli A. (1985)
{'key': 'e_1_2_1_14_1', 'article-title': 'Topography of the core‐mantle boundary and lateral homogeneity of the liquid core', 'author': 'Morelli A.', 'journal-title': 'Nature'} / Nature / Topography of the core‐mantle boundary and lateral homogeneity of the liquid core by Morelli A.
10.1038/305204a0
10.1029/JB091iB10p10203

Dates

Type	When
Created	17 years, 6 months ago (Feb. 6, 2008, 2:04 p.m.)
Deposited	1 year, 9 months ago (Nov. 22, 2023, 7:59 a.m.)
Indexed	1 month, 1 week ago (July 24, 2025, 7:58 a.m.)
Issued	38 years, 8 months ago (Dec. 1, 1986)
Published	38 years, 8 months ago (Dec. 1, 1986)
Published Online	12 years, 8 months ago (Dec. 7, 2012)
Published Print	38 years, 8 months ago (Dec. 1, 1986)

Funders 0

None

BibTeX

@article{Morelli_1986, title={Anisotropy of the inner core inferred from PKIKP travel times}, volume={13}, ISSN={1944-8007}, url={http://dx.doi.org/10.1029/gl013i013p01545}, DOI={10.1029/gl013i013p01545}, number={13}, journal={Geophysical Research Letters}, publisher={American Geophysical Union (AGU)}, author={Morelli, Andrea and Dziewonski, Adam M. and Woodhouse, John H.}, year={1986}, month=dec, pages={1545–1548} }

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