Is there any structure inside the liquid outer core?

Geophysical Research Letters

Volumn 30, Issue 11, 2003, Pages

  Souriau, Annie ^a   Teste, Alexandra ^a   Chevrot, Sébastien ^a  

^a OBSERVATOIRE MIDI PYRÉNÉES   (France)

Author keywords

Anisotropy; Body waves; Liquid core

Indexed keywords

ANISOTROPY; CYLINDERS (CONTAINERS); EIGENVALUES AND EIGENFUNCTIONS;

LIQUID CORES;

GEOPHYSICS;

ANISOTROPY; LIQUID; OUTER CORE; SEISMOLOGY; WAVE PROPAGATION;

EID: 0041911081     PISSN: 00948276     EISSN: None     Source Type: Journal    
DOI: 10.1029/2003GL017008     Document Type: Article

References (30)

1. Beghein, C., and J. Trampert, Robust normal mode constraints on innercore anisotropy from model space search, Science, 299, 552-555, 2003.
2. Creager, K. C., Anisotropy in the inner core from differential travel times of the phases PKP and PKIKP, Nature, 356, 309-314, 1992.
3. Creager, K. C., Inner core anisotropy and rotation, in Mineral physics and seismic tomography, edited by S. I. Karato, L. Stixrude, R. Liebermann, G. Masters, and A. Forte, AGU monograph. 2000.
4. Durek, J. J., and B. Romanowicz, Inner core anisotropy inferred by direct inversion of normal mode spectra, Geophys. J. Int., 139, 599-622, 1999.
5. Dziewonski, A. M., and D. L. Anderson, Preliminary reference Earth model, Phys. Earth Planet. Inter., 25, 297-356, 1981.
6. Engdahl, R. E., R. van der Hilst, and R. P. Buland, Global teleseismic earthquake relocation with improved travel times and procedures for depth determination, Bull. Seismol. Soc. Am., 88, 722-743, 1998.
7. Garcia, R., and A. Souriau, Inner core anisotropy and heterogeneitiy level, Geophys, Res. Lett., 27, 3121-3124, 2000 (corrigendum, Geophys. Res. Lett., 28, 85, 2000).
8. Garnero, E. J., D. V. Helmberger, and S. Grant, Constraining outermost core velocity with SmKS waves, Geophys. Res. Lett., 20, 2463-2466, 1993.
9. Gudmundsson, O., Some problems in global tomography: Modelling the core-mantle boundary and statistical analysis of travel time data, Ph.D. thesis, CalTech, Pasadena, 1989.
10. Ishii, M., J. Tromp, A. M. Dziewonski, and G. Elkström, Joint inversion of normal-mode and body wave data for inner-core anisotropy: 1. Simple models and mantle heterogeneity, J. Geophys. Res., 107(B12), 2379, doi:10,1029/2001JB000712, 2002.
11. Kennett, B. L. N., and E. R. Engdahl, Traveltimes for global earthquake location and phase identification, Geophys. J. Int., 105, 429-465, 1991.
12. Morelli, A., A. M. Dziewonski, and J. H. Woodhouse, Anisotropy of the inner core inferred from PKIKP travel times. Geophys. Res. Lett., 13, 1545-1548, 1986.
13. Ouzounis, A., and K. C. Creager, Isotropy overlying anisotropy at the top of the inner core, Geophys. Res. Lett., 28, 4331-4334, 2001.
14. Ritzwoller, M., G. Master, and F. Gilbert, Observations of anomalous splitting and their interpretation in terms of aspherical structure, J. Geophys. Res., 91, 10,203-10,228, 1986.
15. Romanowicz, B., and L. Bréger, Anomalous splitting of free oscillations: A reevaluation of possible interpretations, J. Geophys. Res., 105, 21,559-21,578, 2000.
16. Romanowicz, B., X.-D. Li, and J. Durek, Anisotropy in the inner core: Could it be due to low-order convection?, Science, 274, 63-66, 1996.
17. Romanowicz, B., H. Tkalcic, and L. Bréger, On the origin of complexity in PKP travel time data, in "Core dynamics, structure and rotation", edited by V. Dehant et al., Am. Geophys. Un. Monograph., 31-44', 2002.
18. Rost, S., and J. Revenaugh, Seismic detetection of rigid zones at the top of the core, Science, 294, 1911-1914, 2001.
19. Roudil, P., and A. Souriau, Liquid core structure and PKP station anomalies derived from PKKP(BC) propagation times, Phys. Earth Planet Inter., 77, 225-236, 1993.
20. Shearer, P. M., K. M. Toy, and J. A. Orcutt, Axi-symmetric Earth models and inner core anisotropy, Nature, 333, 228-232, 1988.
21. Song, X., and D. V. Helmberger, Depth dependence of anisotropy of the Earth's inner core, J. Geophys. Res., 100, 9805-9816, 1995.
22. Souriau, A., and G. Poupinet, A study of the outermost liquid core using differential travel times of SKS, SKKS and S3KS phases, Phys. Earth Planet. Inter., 68, 183-199, 1991.
23. Souriau, A., and G. Poupinet, Inner core rotation: A critical appraisal, in "Core dynamics, structure and rotation", edited by V. Dehant et al., Am. Geophys. Un. Monograph., 65-82, 2002.
24. Stevenson, D. J., Limits on lateral density and velocity variations in the Earth's outer core, Geophys. J. R. Astr. Soc., 88, 311-319, 1987.
25. Su, W.-J., and A. M. Dziewonski, Inner core anisotropy in three dimensions, J. Geophys. Res., 100, 9831-9852, 1995.
26. Sylvander, M., and A. Souriau, Mapping S-velocity heterogeneities in the D" region from SnKS differential travel times, Phys. Earth Planet. Inter., 94, 1-21, 1996.
27. Tanaka, S., and H. Hamaguchi, Degree one heterogeneity at the top of the Earth's core, revealed by SmKS travel times, in "Dynamics of Earth's deep interior and Earth rotation", Am. Geophys. Un. Monograph., 72, 127-134, 1993.
28. Tromp, J., Support for anisotropy of the Earth's inner core from free oscillations, Nature, 366, 678-681, 1993.
29. Tromp, J., Inner-core anisotropy and rotation, Annu. Rev. Earth Planet. Sci., 29, 29-47, 2001.
30. Widmer, R., G. Masters, and F. Gilbert, Observably split multiplets - data analysis and interpretation in terms of large-scale aspherical structure, Geophys. J. Int., III, 559-576, 1992.