Topography of Earth's inner core boundary from high-quality waveform doublets

Geophysical Journal International

Volumn 175, Issue 1, 2008, Pages 386-399

  Song, Xiaodong ^a   Dai, Wei ^a  

^a UNIVERSITY OF ILLINOIS AT URBANA CHAMPAIGN   (United States)

Author keywords

Body waves; Composition of the core; Rapid time variations; Wave scattering and diffraction

Indexed keywords

BODY WAVE; CORE-MANTLE BOUNDARY; INNER CORE; PRECISION; SEISMIC ANISOTROPY; SEISMIC REFLECTION; SEISMIC REFRACTION; SEISMIC TOMOGRAPHY; SPATIOTEMPORAL ANALYSIS; TELESEISMIC WAVE; VELOCITY STRUCTURE; WAVE DIFFRACTION; WAVE SCATTERING; WAVEFORM ANALYSIS;

AFRICA; ATLANTIC OCEAN; CENTRAL AMERICA; INDIAN OCEAN;

EID: 53549124096     PISSN: 0956540X     EISSN: 1365246X     Source Type: Journal    
DOI: 10.1111/j.1365-246X.2008.03909.x     Document Type: Article

References (35)

1. Bloxham, J. & Gubbins, D., 1987. Thermal core mantle interactions, Nature, 325, 511-513.
2. Buffett, B.A. & Glatzmaier, G.A., 2000. Gravitational braking of inner-core rotation in geodynamo simulations, Geophys. Res. Lett., 27, 3125-3128.
3. Cao, A.M. & Romanowicz, B., 2004. Hemispherical transition of seismic attenuation at the top of the earth's inner core, Earth planet. Sci. Lett., 228(3-4), 243-253.
4. Cao, A.M., Masson, Y. & Romanowicz, B., 2007. Short wavelength topography on the inner-core boundary, Proc. Nat. Acad. Sci. USA, 104(1), 31-35.
5. Cleary, J.R. & Haddon, R.A.W., 1972. Seismic wave scattering near the core-mantle boundary: A new interpretation of precursors to PKP, Nature, 240, 549-551.
6. Collier, J.D. & Helffrich, G., 2001. Estimate of inner core rotation rate from United Kingdom regional seismic network data and consequences for inner core dynamical behaviour, Earth planet. Sci. Lett., 193, 523-537.
7. Cormier, V.F., 2007. Texture of the uppermost inner core from forward- and back-scattered seismic waves, Earth planet. Sci. Lett., 258, 442-453.
8. Cormier, V.F., Xu, L. & Choy, G.L., 1998. Seismic attenuation of the inner core: Viscoelastic or stratigraphic? Geophys. Res. Lett., 25, 4019-4022.
9. Creager, K.C., 1997. Inner core rotation rate from small-scale heterogeneity and time-varying travel times, Science, 278, 1284-1288.
10. Dai, W., 2007. Teleseismic earthquake waveform doublets from South Sandwich Islands subduction zone: Spatial and temporal distributions and implications for inner core rotation, MS thesis, U. Illinois at Urbana-Champaign.
11. Garcia, R., 2002. Constraints on upper inner-core structure from waveform inversion of core phases, Geophys. J. Int., 150, 651-664.
12. Glatzmaier, G.A. & Roberts, P.H., 1995. A three-dimensional convective dynamo solution with rotating and finitely conducting inner core and mantle, Phys. Earth planet. Inter., 91, 63-75.
13. Hedlin, M.A.H., Shearer, P.M. & Earle, P.S., 1997. Seismic evidence for small-scale heterogeneity throughout the Earth's mantle, Nature, 387, 145-150.
14. Koper, K.D., Franks, J.M. & Dombrovskaya, M., 2004. Evidence for small-scale heterogeneity in Earth's inner core from a global study of PKiKP coda waves, Earth planet. Sci. Lett., 228(3-4), 227-241.
15. Krasnoshchekov, D.N., Ovtchinnikov, V.M. Kaazik, P.B., 2005. Seismological evidence for mosaic structure of the surface of the Earth's inner core, Nature, 435, 483-487.
16. Laske, G. & Masters, G., 2003. The Earth's free oscillations and the differential rotation of the inner core, in Earth's Core: Dynamics, Structure, and Rotation, Vol. 31: Geodynamics Series, pp. 45-63, eds Dehant, V.M., Creager, K.C., Zatman, S. & Karato, S., American Geophysical Union.
17. Li, A.Y. & Richards, P.G., 2003. Using earthquake doublets to study inner core rotation and seismicity catalog precision, Geochem. Geophys. Geosys., 4(9), 1072, doi: 10.1029/2002GC000379.
18. Lindner, D., Song, X.D., Ma, P. & Christensen, D.H., 2007. A new approach to determine inner-core rotation, in Proceedings of the Fall. AGU Meet., San Francisco.
19. Loper, D.E. & Roberts, P.H., 1981. A study of conditions at the inner core boundary of the earth, Phys. Earth planet. Inter., 24(4), 302-307.
20. Niu, F.L. & Wen, L.X., 2001. Hemispherical variations in seismic velocity at the top of the Earth's inner core, Nature, 410, 1081-1084.
21. Poupinet, G. & Kennett, B.L.N., 2004. On the observation of high frequency PKiKP and its coda in Australia, Phys. Earth planet. Inter., 146(3-4), 497-511.
22. Song, X.D. & Helmberger, D.V., 1995. A P-wave valocity model of the Earth's core, J. geophys. Res., 100, 9817-9830.
23. Song, X.D. & Poupinet, G., 2007. Inner core rotation from event-pair analysis, Earth planet. Sci. Lett., 261, 259-266, doi: 10.1016/ j.epsl.2007.06.034.
24. Song, X.D. & Richards, P.G., 1996. Seismological evidence for differential rotation of the Earth's inner core, Nature, 382, 221-224.
25. diff) data: An argument in favor of radial inhomogeneity, Geophys. Res. Lett., 18, 2023-2026.
26. Stroujkova, A. & Cormier, V.F., 2004. Regional variations in the uppermost 100 km of the Earth's inner core, J. geophys. Res., 109(B10), B10307, doi: 10.1029/2004JB002976.
27. Sumita, I. & Olson, P., 1999. A laboratory model for convection in Earth's core driven by a thermally heterogeneous mantle, Science, 286, 1547-1549.
28. Vidale, J.E. & Earle, P.S., 2000. Fine-scale heterogeneity in the Earth's inner core Nature, 404, 273-275.
29. Vidale, J.E. & Earle, P.S., 2005. Evidence for inner-core rotation from possible changes with time in PKP coda, Geophys. Res. Lett., 32, L01309, doi: 10.1029/2004GL021240.
30. Vidale, J.E., Dodge, D.A. & Earle, P.S., 2000. Slow differential rotation of the Earth's inner core indicated by temporal changes in scattering, Nature, 405, 445-448.
31. Wen, L.X., 2006. Localized temporal change of the earth's inner core boundary, Science, 314, 967-970.
32. Yu, W.C. & Wen, L.X., 2006. Seismic velocity and attenuation structures in the top 400 km of the Earth's inner core along equatorial paths, J. geophys. Res., 111, B07308, doi: 10.1029/2005JB003995.
33. Yu, W.C., Wen, L.X. & Niu, F.L., 2005. Seismic velocity structure in the Earth's outer core, J. geophys. Res., 110, B02302, doi: 10.1029/ 2003JB002928.
34. Zhang, J., Song, X.D., Li, Y.C., Richards, P.G., Sun, X.L. & Waldhauser, F., 2005. Inner core differential motion confirmed by earthquake doublet waveform doublets, Science, 309, 1357-1360.
35. Zou, Z., Koper, K. & Cormier, V.F., 2006. Constraints on the velocity gradient at the base of the outer core and inner core Q from PKPBC Diffracted Waves, in Proceedings of the Fall. AGU Meet., San Francisco.