Effects of D″ anisotropy on seismic velocity models of the outermost core

Geophysical Research Letters

Volumn 25, Issue 13, 1998, Pages 2341-2344

  Garhero, Edward J ^a   Lay, Thorne ^b  

^a UNIVERSITY OF CALIFORNIA   (United States)

^b UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ANISOTROPY; EARTH CORE; SEISMIC VELOCITY; VELOCITY STRUCTURE;

ANISOTROPY; SEISMIC WAVES; SEISMOLOGY; SHEAR WAVES; APPROXIMATION THEORY; MATHEMATICAL MODELS; PERTURBATION TECHNIQUES; SEISMOGRAPHS;

CONSTRUCTING MODELS; CORE-MANTLE BOUNDARY; LATERAL VARIATIONS; SEISMIC VELOCITY MODELS; SHEAR WAVE SPLITTING; SHEAR-WAVE ANISOTROPY; SYNTHETIC SEISMOGRAM; TRANSVERSE ISOTROPY;

SHEAR FLOW; SEISMIC PROSPECTING;

CORE MANTLE BOUNDARY (CMB); REFLECTIVITY SYNTHETIC SEISMOGRAMS; TRANSVERSE ISOTROPY;

EID: 0032105552     PISSN: 00948276     EISSN: None     Source Type: Journal    
DOI: 10.1029/98gl01653     Document Type: Article

References (20)

1. Backus, G.E., Long-wave elastic anisotropy produced by horizontal layering, J. Geophys. Res., 67, 4427-44-40, 1962.
2. Braginsfci, S.I., MAC-Oscillations of the hidden ocean of the core, J. Geomag. Geoelectr., 45, 1517-1538, 1993.
3. Dziewonski, A. M., and D. L. Anderson, Preliminary reference Earth model (PREM), Phys. Earth Planet. Int., 25. 297-356, 1981.
4. Gamero E. J., D. V. Helmberger, and S. P. Grand, Constraining outermost core velocity with SmKS waves, Geophys. Res. Lett., 20, 2463-2466, 1993.
5. Gamero, EJ., and D.V. Hclmbcrger, On seismic resolution of laterally heterogeneity in the Earth's outermost core, Plys. Earth Planet. Int., 88, 117-130, 1995.
6. Garnero, EJ., and T. Lay, Lateral variations in lowermost mantle shear wave anisotropy beneath the north Pacific and Alaska, J. Geophys. Res., 102. 8121-8135, 1997.
7. Hales, A. L., and J. L. Roberts, The velocities in the outer core, Bull. Seismol. Soc. Am.. 61, 1051-1059, 1971.
8. Kendall J.-M., and P. G. Silver, Constraints from seismic anisotropy on the nature of the lowermost mantle, Nature, 381, 409-412, 1996.
9. Lay, T., and C. J. Young, The stably-stratified outermost core revisited, Geophys. Res. Lett., 17, 2001-2004, 1990.
10. Lay, T., and C. J. Young, Analysis of SV waves in the core's penumbra, Geophys. Res. Lett., 18, 1373-1376, 1991.
11. Lay, T., EJ. Gamero, Q. Williams, L. Kellogg, and M.E. Wysession, Seismic wave anisotropy in the D″ region and its implications, in The Core-Mantle Boundary, edited by M. Gumis, et al., AGU, Washington, D.C., in press, 1998.
12. Loper, D.E., and T. Lay, The core-mantle boundary region, J. Geophys. Res., 100. 6397-6420, 1995.
13. Matzcl, E., M. K. Sen, and S. P. Grand, Evidence for anisotropy in the deep mantle beneath Alaska, Geophys. Res. Lett., 18, 2417-2420, 1996.
14. Maupin, V., On the possibility of anisotropy in the D″ layer as inferred from the polarization of diffracted S waves, Phys. Earth Planet. Int., 87, 1-32, 1994.
15. Müller, G., The reflectivity method: a tutorial, J. Geophys., 58, 153-174, 1985.
16. Kitscma, J.E., EJ. Garnero, and T. Lay, A strongly negative shear velocity gradient and lateral variability in the lowermost mantle beneath the Pacific, J. Geophys. Res.. 102, 20395-20,411, 1997.
17. Souriau, A., and G. Poupinet, A study of the outermost liquid core using differential travel times of the SKS, SKKS, and S3KS phases, Phys. Earth Planet. Int., 68, 183-199, 1991.
18. Tanaka, S. and II. Hamaguchi, Velocities and chemical stratification in the outermost core, J. Geomag. Geoelectr., 45, 1287-1301, 1993.
19. Vinnik, L., L. Breger, and B. Romanowicz, On the inversion of Sd particle motion for seismic anisotropy in D″, Geophys. Res. Lett., 25, 679-682, 1998.
20. Young, C. J., and T. Lay, Multiple phase analysis of the shear velocity structure in the D″ region beneath Alaska, J. Geophys. Res.. 95, 17,385-17,402, 1990.