Antipodal seismic observations of temporal and global variation at Earth's inner-outer core boundary

Geophysical Research Letters

Volumn 37, Issue 11, 2010, Pages

  Butler, Rhett ^a,b   Tsuboi, Seiji ^c  

^a UNIVERSITY OF HAWAII   (United States)

^b IRIS Consortium   (United States)

^c JAPAN AGENCY FOR MARINE EARTH SCIENCE AND TECHNOLOGY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

ALGERIA; CORE BOUNDARY; EARTH MODELS; GLOBAL VARIATIONS; INNER CORE; LOW-VELOCITY ZONE; SEISMIC ARRAYS; SEISMIC ENERGY; SEISMIC OBSERVATION; SEISMIC PHASIS; TEMPORAL VARIATION; WAVE FORMS; WAVEFORM DATA;

TOOLS;

SEISMOLOGY;

INNER CORE; LOW VELOCITY ZONE; OUTER CORE; SEISMIC DATA; SEISMIC METHOD; TEMPORAL VARIATION; WAVEFORM ANALYSIS;

EID: 77953551914     PISSN: 00948276     EISSN: None     Source Type: Journal    
DOI: 10.1029/2010GL042908     Document Type: Article

References (35)

1. Bassin, C, G. Laske, and G. Masters (2000), The current limits of resolution for surface wave tomography in North America, Eos Trans. AGU, 81, F897.
2. Braginsky, S. I. (1963), Structure of the F layer and reasons for convection in the Earth's core, Dokl. Akad. Nauk SSSR, Engl. Transl., 149, 1311-1314.
3. Butler, R. (1986), Amplitudes at the antipode, Bull. Seismol. Soc. Am., 76, 1355-1365.
4. Creager, K. C. (1992), Anisotropy of the inner core from differential travel times of the phases PKP and PKIKP, Nature, 356, 309-314, doi:10.1038/356309a0.
5. Creager, K. C. (1997), Inner core rotation rate from small-scale heterogeneity and time-varying travel times, Science, 278, 1284-1288, doi: 10.1126/science.278.5341.1284. (Pubitemid 27495739)
6. Dziewonski, A. M., and D. L. Anderson (1981), Preliminary reference Earth model, Phys. Earth Planet. Inter., 25, 297-356, doi:10.1016/0031-9201(81)90046- 7.
7. Garnero, E. J. (2000), Heterogeneity of the lowermost mantle, Annu. Rev. Earth Planet. Sci., 28, 509-537, doi:10.1146/annurev.earth.28.1.509.
8. Ishii, M., and A. M. Dziewonski (2002), The innermost inner core of the Earth: Evidence for a change in anisotropic behavior at the radius of about 300 km, Proc. Natl. Acad. Sci. U. S. A., 99, 14,026-14,030, doi:10.1073/pnas. 172508499. (Pubitemid 35257618)
9. Jacobs, J. A. (1953), The Earth's inner core, Nature, 172, 297-298, doi:10.1038/172297a0.
10. Jeffreys, H., and K. E. Bullen (1958), Seismological Tables, Br. Assoc. for the Adv. of Sci., Burlington House, London.
11. Kennett, B. L. N., E. R. Engdahl, and R. Buland (1995), Constraints on seismic velocities in the Earth from traveltimes, Geophys. J. Int., 122, 108-124, doi:10.1111/j.1365-246X.1995.tb03540.x.
12. Komatitsch, D., and J. P. Vilotte (1998), The spectral-element method: An efficient tool to simulate the seismic response of 2D and 3D geological structures, Bull. Seismol. Soc. Am., 88, 368-392.
13. Komatitsch, D., J. Ritsema, and J. Tromp (2002), The spectral-element method, Beowulf computing, and global seismology, Science, 298, 1737-1742, doi:10.1126/science.1076024. (Pubitemid 35404108)
14. Laske, G., and G. Masters (1999), Limits on differential rotation of the inner core from an analysis of the Earth's free oscillations, Nature, 402, 66-69, doi:10.1038/47011. (Pubitemid 29533514)
15. Morelli, A., A. M. Dziewonski, and J. H. Woodhouse (1986), Anisotropy of the core inferred from PKIKP travel times, Geophys. Res. Lett., 13, 1545-1548, doi:10.1029/GL013i013p01545.
16. Niu, F., and Q.-F. Chen (2008), Seismic evidence for distinct anisotropy in the innermost inner core, Nat. Geosci., 1, 692-696, doi:10.1038/ngeo314.
17. Niu, F., and L. Wen (2001), Hemispherical variations in seismic velocity at the top of the Earth's inner-core, Nature, 410, 1081-1084, doi:10.1038/35074073. (Pubitemid 32391036)
18. Obayashi, M., H. Sugioka, J. Yoshimitsu, and Y. Fukao (2006), High temperature anomalies oceanward of subducting slabs at the 410-km discontinuity, Earth Planet. Sci. Lett, 243, 149-158, doi:10.1016/j.epsl.2005. 12.032.
19. Poupinet, G., R. Pillet, and A. Souriau (1983), Possible heterogeneity of the Earth's core deduced from PKIKP travel times, Nature, 305, 204-206, doi:10.1038/305204a0.
20. Poupinet, G., W. Ellsworth, and J. Frechet (1984), Monitoring velocity variations in the crust using earthquake doublets: an application to the Calaveras Fault, California, J. Geophys. Res., 89, 5719-5731, doi:10.1029/JB089iB07p05719.
21. Rial, J. A. (1979), Seismic waves at the epicenter's antipode, Ph.D. dissertation, Calif. Inst. of Technol., Pasadena.
22. Rial, J. A., and V. F. Cormier (1980), Seismic waves at the epicenter's antipode, J. Geophys. Res., 85, 2661-2668, doi:10.1029/JB085iB05p02661.
23. Shearer, P. M. (1994), Constraints on inner core anisotropy from ISC PKP (DF) travel times, J. Geophys. Res., 99, 19,647-19,659, doi:10.1029/94JB01470.
24. Song, X., and D. V. Helmberger (1993), Anisotropy of Earth's inner core, Geophys. Res. Lett, 20, 2591-2594, doi:10.1029/93GL02812.
25. Song, X., and D. V. Helmberger (1995), A P wave velocity model of Earth's core, J. Geophys. Res., 100, 9817-9830, doi:10.1029/94JB03135.
26. Song, X., and D. V. Helmberger (1998), Seismic evidence for an inner core transition zone, Science, 282, 924-927, doi:10.1126/science.282. 5390.924.
27. Song, X., and P. G. Richards (1996), Seismological evidence for differential rotation of the Earth's inner-core, Nature, 382, 221-224, doi:10.1038/382221a0. (Pubitemid 26251349)
28. Stroujkova, A., and V. F. Cormier (2004), Regional variations in the uppermost 100 km of the Earth's inner core, J. Geophys. Res., 109, B10307, doi:10.1029/2004JB002976. (Pubitemid 40098499)
29. Tanaka, S., and H. Hamaguchi (1997), Degree one heterogeneity and hemispherical variation of anisotropy in the inner core from PKP(BC) and PKP(DF) times, J. Geophys. Res., 102, 2925-2938, doi:10.1029/96JB03187.
30. Tromp, J. (1993), Support for anisotropy of the Earth's inner core from free oscillations, Nature, 366, 678-681, doi:10.1038/366678a0.
31. Wen, L., and F. Niu (2002), Seismic velocity and attenuation structures in the top of the Earth's inner core, J. Geophys. Res., 107(B11), 2273, doi:10.1029/2001JB000170.
32. Woodhouse, J. H., D. Giardini, and X.-D. Li (1986), Evidence for inner core anisotropy from splitting in free oscillation data, Geophys. Res. Lett, 13, 1549-1552, doi:10.1029/GL013i013p01549.
33. Yu, W., L. Wen, and F. Niu (2005), Seismic velocity structure in the Earth's outer core, J. Geophys. Res., 110, B02302, doi:10.1029/2003JB002928. (Pubitemid 40763101)
34. Zhang, J., X. Song, Y. Li, P. G. Richards, X. Sun, and F. Waldhauser (2005), Inner core differential motion confirmed by earthquake waveform doublets, Science, 309, 1357-1360, doi:10.1126/science.1113193. (Pubitemid 41209359)
35. Zou, Z., K. D. Koper, and V. F. Cormier (2008), The structure of the base of the outer core inferred from seismic waves diffracted around the inner core, J. Geophys. Res., 113, B05314, doi:10.1029/2007JB005316.