Lower mantle heterogeneity beneath Eurasia imaged by parametric migration of shear waves

Physics of the Earth and Planetary Interiors

Volumn 108, Issue 3, 1998, Pages 201-218

  Bilek, Susan L ^a   Lay, Thorne ^a  

^a UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

MANTLE STRUCTURE; SEISMIC VELOCITY; VELOCITY STRUCTURE;

ASIA; EUROPE;

EID: 0032514092     PISSN: 00319201     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0031-9201(98)00105-8     Document Type: Article

References (44)

1. Dziewonski A.M., Anderson D.L. Preliminary reference Earth model. Phys. Earth Planet. Inter. 25:1981;297-356.
2. Gaherty J.B., Lay T. Investigation of laterally heterogeneous shear velocity structure in D″ beneath Eurasia. J. Geophys. Res. 97:1992;417-435.
3. Garnero E.J., Helmberger D.V. Travel times of S and SKS: implications for three-dimensional lower mantle structure beneath the central Pacific. J. Geophys. Res. 98:1993;8225-8241.
4. Garnero E.J., Helmberger D.V. Seismic detection of a thin laterally varying boundary layer at the base of the mantle beneath the central Pacific. Geophys. Res. Lett. 23:1996;977-980.
5. Garnero E.J., Helmberger D.V., Grand S. Preliminary evidence for a lower mantle shear wave velocity discontinuity beneath the central Pacific. Phys. Earth Planet. Inter. 79:1993;335-347.
6. Grand S.P. Mantle shear structure beneath the Americas and surrounding oceans. J. Geophys. Res. 99:1994;11591-11622.
7. Grand S.P., van der Hilst R.D., Widiyantoro S. Global seismic tomography: a snapshot of convection in the Earth. GSA Today. 7:1997;1-7.
8. Hadden R.A.W., Buchbinder G.G.R. S wave scattering by 3-D heterogeneities at the base of the mantle. Geophys. Res. Lett. 14:1987;891-894.
9. Houard S., Nataf H.-C. Further evidence for the Lay discontinuity beneath Northern Siberia and the North Atlantic from short period P waves recorded in France. Phys. Earth Planet. Inter. 72:1992;264-275.
10. Houard S., Nataf H.-C. Laterally varying reflector at the top of D″ beneath northern Siberia. Geophys. J. Int. 115:1993;168-182.
11. Kendall J.-M., Nangini C. Lateral variations in D″ below the Caribbean. Geophys. Res. Lett. 23:1996;399-402.
12. Kendall J.-M., Shearer P.M. Lateral variations in D″ thickness from long period shear wave data. J. Geophys. Res. 99:1994;11575-11590.
13. Knittle E., Jeanloz R. Simulating the core-mantle boundary: an experimental study of high-pressure reactions between silicates and liquid iron. Geophys. Res. Lett. 16:1989;609-612.
14. Knittle E., Jeanloz R. Earth's core-mantle boundary: results of experiments at high pressures and temperatures. Science. 251:1991;1438-1443.
15. Kohler M.D., Vidale J.E., Davis P.M. Complex scattering within D″ observed on the very dense Los Angeles Region Seismic Experiment passive array. Geophys. Res. Lett. 24:1997;1855-1859.
16. Krüger F., Weber M., Scherbaum F., Schlittenhardt J. Double beam analysis of anomalies in the core-mantle boundary region. Geophys. Res. Lett. 20:1993;1475-1478.
17. Krüger F., Weber M., Scherbaum F., Schlittenhardt J. Evidence for normal and inhomogeneous lowermost mantle and core-mantle boundary structure under the Arctic and northern Canada. Geophys. J. Int. 122:1995;637-657.
18. Lay T. Evidence of a lower mantle shear wave discontinuity in S and sS phases. Geophys. Res. Lett. 13:1986;1493-1496.
19. Lay T. Seismology of the lower mantle and core-mantle boundary. Rev. Geophys. 33:1995;325-328.
20. Lay T., Helmberger D.V. A lower mantle S wave triplication and the shear velocity structure of D″ Geophys. J. R. Astron. Soc. 75:1983;799-838.
21. Lay T., Young C.J. The effect of SKS scattering on models of the shear velocity structure of the D″ region. J. Geophys. 59:1986;11-15.
22. Lay T., Young C.J. Imaging scattering structures in the lower mantle by migration of long period shear waves. J. Geophys. Res. 101:1996;20023-20040.
23. Lay T., Garnero E.J., Young C.J., Gaherty J.B. Scale lengths of shear velocity heterogeneity at the base of the mantle from S wave differential travel times. J. Geophys. Res. 102:1997;9887-9909.
24. Li X.D., Romanowicz B. Global mantle shear velocity model developed using nonlinear asymptotic coupling theory. J. Geophys. Res. 101:1996;22245-22272.
25. Loper D.E., Lay T. The core-mantle boundary region. J. Geophys. Res. 100:1995;6397-6420.
26. Lynnes C.S., Lay T. Inversion of P coda for isotropic scatterers at the Yucca Flat test site. Bull. Seismol. Soc. Am. 79:1989;790-804.
27. Masters T.J., Johnson S., Laske G., Bolton H. A shear velocity model of the mantle. R. Soc. London Philos. Trans. 354:1996;1385-1411.
28. Nataf H.-C., Houard S. Seismic discontinuity at the top of D″: a worldwide feature? Geophys. Res. Lett. 20:1993;2371-2374.
29. Revenaugh J. A scattered-wave image of subduction beneath the Transverse Ranges. Science. 268:1995;1888-1892.
30. Revenaugh J., Jordan T.H. Mantle layering from ScS reverberations: 4. The lower mantle and core-mantle boundary region. J. Geophys. Res. 96:1991;19811-19824.
31. Scherbaum F., Krüger F., Weber M. Double beam imaging: mapping lower mantle heterogeneities using combinations of source and receiver arrays. J. Geophys. Res. 102:1997;507-522.
32. Su W.-J., Woodward R., Dziewonski A.M. Degree 12 model of shear velocity heterogeneity in the mantle. J. Geophys. Res. 99:1994;6945-6980.
33. Thomas Ch., Weber M. P velocity heterogeneities in the lower mantle determined with the German Regional Seismic Network: improvement of previous models and results of 2D modelling. Phys. Earth Planet. Inter. 101:1997;105-117.
34. van der Hilst R.D., Widiyantoro S., Engdahl E.R. Evidence for deep mantle circulation from global tomography. Nature. 286:1997;578-584.
35. Vidale J.E., Benz H.M. A sharp and flat section of the core-mantle boundary. Nature. 359:1992;627-629.
36. Vidale J.E., Benz H.M. Seismological mapping of the fine structure near the base of the Earth's mantle. Nature. 361:1993;529-532.
37. Weber M. P- and S- wave reflections from anomalies in the lowermost mantle. Geophys. J. Int. 115:1993;183-210.
38. Weber M., Davis J.P. Evidence of a laterally variable lower mantle structure from P and S waves. Geophys. J. Int. 102:1990;231-255.
39. Weber M., Körnig M. A search for anomalies in the lowermost mantle using seismic bulletins. Phys. Earth Planet. Inter. 73:1992;1-28.
40. Wessel P., Smith W.H.F. Free software helps map and display data. EOS Trans. AGU. 72(441):1991;445-446.
41. Wysession M.E., Bartko L., Wilson J.B. Mapping the lowermost mantle using core-reflected shear waves. J. Geophys. Res. 99:1994;13667-13684.
42. Wysession, M.E., Lay, T., Revenaugh, J., Williams, Q., Garnero, E.J., Jeanloz, R., Kellogg, L.H, 1998. The D″ discontinuity and its implications. In: Gurnis, M., Buffet, B., Knittle, E., Wysession, M.E. (Eds.), AGU Monograph on the Core-Mantle Boundary, in press.
43. Ying, J., Nataf, H.-C., 1998. Detection of mantle plumes in the lower mantle by diffraction tomography: Hawaii. Earth Planet. Sci. Lett., in press.
44. Young C.J., Lay T. The core-mantle boundary. Annu. Rev. Earth Planet. Sci. 15:1987;25-46.