Localized double-array stacking analysis of PcP: D″ and ULVZ structure beneath the Cocos plate, Mexico, central Pacific, and north Pacific

Physics of the Earth and Planetary Interiors

Volumn 173, Issue 1-2, 2009, Pages 60-74

  Hutko, Alexander R ^a   Lay, Thorne ^b   Revenaugh, Justin ^c  

^a DENVER FEDERAL CENTER   (United States)

^b UNIVERSITY OF CALIFORNIA   (United States)

^c UNIVERSITY OF MINNESOTA   (United States)

Author keywords

CMB; D ; D Discontinuity; LLSVP; PcP; ULVZ

Indexed keywords

ACOUSTIC WAVE VELOCITY; OXIDE MINERALS; PERCOLATION (FLUIDS); PEROVSKITE; PHASE TRANSITIONS; REFLECTION; SHEAR WAVES; STRUCTURAL GEOLOGY;

BROAD BAND SIGNALS; CMB; CORE-MANTLE BOUNDARIES; DATA SAMPLINGS; HIGH QUALITIES; LLSVP; LOWERMOST MANTLES; ME-XICO; NORTH PACIFIC; ONE-DIMENSIONAL; P-WAVE VELOCITIES; P-WAVE VELOCITY STRUCTURES; PCP; PEROVSKITE TO POST-PEROVSKITE PHASE TRANSITIONS; SHEAR VELOCITIES; TIGHT BOUNDS; ULTRA-LOW VELOCITY ZONES; ULVZ; WAVE DATUM; WAVE DISCONTINUITIES;

PLATES (STRUCTURAL COMPONENTS);

COCOS PLATE; CORE-MANTLE BOUNDARY; DATA SET; DISCONTINUITY; LOW VELOCITY ZONE; P-WAVE; S-WAVE; STACKING; VELOCITY STRUCTURE; WAVE VELOCITY;

MEXICO [NORTH AMERICA]; NORTH AMERICA; PACIFIC OCEAN; PACIFIC OCEAN (CENTRAL);

EID: 61349169550     PISSN: 00319201     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.pepi.2008.11.003     Document Type: Article

References (45)

1. Avants M., Lay T., and Garnero E.J. A new probe of ULVZ S-wave velocity structure: array stacking of ScS waveforms. Geophys. Res. Lett. 33 (2006) L07314 10.1029/2005GL024989
2. Avants M., Lay T., Russell S.A., and Garnero E.J. Shear velocity variation within the D″ region beneath the Central Pacific. J. Geophys. Res. 111 (2006) B055305 10.1029/2004JB003270
3. Castle J.C., and van der Hilst R.D. The core-mantle boundary under the Gulf of Alaska: no ULVZ for shear waves. Earth Planet. Sci. Lett. 176 (2000) 311-321
4. Ding X.M., and Helmberger D.V. Modeling D″ structure beneath Central America with broadband seismic data. Phys. Earth Planet. Int. 101 (1997) 245-270
5. Garnero E.J., and Lay T. D″ shear velocity heterogeneity, anisotropy and discontinuity structure beneath the Caribbean and Central America. Phys. Earth Planet. Int. 140 (2003) 219-242
6. Garnero E.J., and McNamara A.K. Structure and dynamics of Earth's lower mantle. Science 320 (2008) 626-628
7. Garnero E.J., Revenaugh J.S., Williams Q., Lay T., and Kellog L.H. Ultralow velocity zone at the core-mantle boundary. In: Gurnis M., Wysession M., Knittle E., and Buffett B. (Eds). The Core-Mantle Boundary Region vol. 28 (1998), American Geophysical Union Monograph Geodynamics Series 319-334
8. Grand S.P. Mantle shear-wave tomography and the fate of subducted slabs. Phil. Trans. R. Soc. Lond. A 360 (2002) 2475-2491
9. Havens E., and Revenaugh J. A broadband seismic study of the lowermost mantle beneath Mexico: constraints on ultralow velocity zone elasticity and density. J. Geophys. Res. 106 (2001) 30, 809-30, 920
10. Hutko A.R., Lay T., Garnero E.J., and Revenaugh J. Seismic detection of folded subducted lithosphere at the core-mantle boundary. Nature 441 (2006) 333-336
11. Hutko A.R., Lay T., Revenaugh J., and Garnero E.J. Anti-correlated seismic velocity anomalies from post-perovskite in the lowermost mantle. Science 320 (2008) 1070-1074
12. Kendall J.-M., and Nangini C. D″ beneath the Caribbean and Central America. Geophys. Res. Lett. 23 (1996) 399-402
13. Kendall J.-M., and Shearer P.M. Lateral variations in D″ thickness form long-period shear wave data. J. Geophys. Res. 99 (1994) 11, 575-11, 590
14. Kennett B.L.N., and Engdahl E.R. Travel times for global earthquake location and phase identification. Geophys. J. Int. 105 (1991) 429-465
15. Kito T., Rost S., Thomas C., and Garnero E.J. New insights into the P- and S-wave velocity structure of the D″ discontinuity beneath the Cocos plate. Geophys. J. Int. 169 (2007) 631-645
16. Kohler M.D., Vidale J.E., and Davis P.M. Complex scattering within D″ observed on the very dense Los Angeles Region Seismic Experiment passive array. Geophys. Res. Lett. 24 (1997) 1855-1858
17. Krüger F., Weber M., and Scherbaum F. Double beam analysis of anomalies in the core-mantle boundary region. Geophys. Res. Lett. 20 (2000) 1475-1478
18. Lay T., and Garnero E.J. Reconciling the post-perovskite phase with seismological observations of the lowermost mantle. In: Hirose K., Brodholt J., Lay T., and Yuen D. (Eds). Post-Perovskite: The Last Mantle Phase Change. vol. 174 (2007), American Geophysical Union Geophys. Monogr. Ser. 129-153
19. Lay T., and Helmberger D.V. A lower mantle S-wave triplication and the shear velocity structure of D″. Geophys. J. R. Astr. Soc. 75 (1983) 799-837
20. Lay T., Garnero E.J., and Russell S.A. Lateral variation of the D″ discontinuity beneath the Cocos Plate. Geophys. Res. Lett. 31 (2004) L15612 10.1029/2004GL020300
21. Lay T., Hernlund J., Garnero E.J., and Thorne M.S. A post-perovskite lens and D″ heat flux beneath the central Pacific. Science 314 (2006) 1272-1276
22. Mori J., and Helmberger D.V. Localized boundary layer below the mid-Pacific velocity anomaly identified from a PcP precursor. J. Geophys. Res. 100 (1995) 20, 359-20, 365
23. 3. Science 304 (2004) 855-858
24. Müller G. The reflectivity method: a tutorial. J. Geophys. 58 (1985) 153-174
25. Persh S.E., Vidale J.E., and Earle P.S. Absence of short-period ULVZ precursors to PcP and ScP from two regions of the CMB. Geophys. Res. Lett. 28 (2001) 387-390
26. Reasoner C., and Revenaugh J. Short-period P wave constraints on D″ reflectivity. J. Geophys. Res. 104 (1999) 955-961
27. Revenaugh J., and Meyer R. Seismic evidence of partial melt within a possibly ubiquitous low-velocity layer at the base of the mantle. Science 277 (1997) 670-673
28. Rost S., and Revenaugh J. Small-scale ultralow-velocity zone structure imaged by ScP. J. Geophys. Res. 108 (2003) 2056 10.1029/2001JB001627
29. Rost S., and Revenaugh J. Small-scale changes of core-mantle boundary reflectivity. Phys. Earth Planet. Int. 145 (2004) 19-36
30. Rost S., and Thomas C. Array seismology, methods and application. Rev. Geophys. (2002) 10.1029/2000RG000100
31. Russell S.A., Lay T., and Garnero E.J. Small-scale lateral shear velocity and anisotropy heterogeneity near the core-mantle boundary beneath the central Pacific imaged using broadband ScS waves. J. Geophys. Res. 104 (1999) 13, 183-13, 199
32. Russell S.A., Reasoner C., Lay T., and Revenaugh J. Coexisting shear- and compressional-wave seismic velocity discontinuities beneath the central Pacific. Geophys. Res. Lett. 28 (2001) 2281-2284
33. Scherbaum F., Krüger F., and Weber M. Double beam imaging: mapping lower mantle heterogeneities using combinations of source and receiver arrays. J. Geophys. Res. 102 (1997) 507-522
34. Sun X., Song X., Zheng S., and Helmberger D.V. Evidence for a chemical-thermal structure at base of mantle from sharp lateral P-wave variations beneath Central America. Proc. Nat. Acad. Sci. U.S.A. 104 (2007) 26-30
35. Thomas C., Garnero E.J., and Lay T. High resolution imaging of the lowermost mantle structure under the Cocos plate. J. Geophys. Res. 109 (2004) B08307 10.1029/2004JB003013
36. Thomas C., Heesom T., and Kendall J.M. Investigating the heterogeneity of the D″ region beneath the northern Pacific using a seismic array. J. Geophys. Res. 107 (2002) B112274 10.1029/2000JB000021
37. Thorne M.S., and Garnero E.J. Inferences on ultralow-velocity zone structure from a global analysis of SPdKS waves. J. Geophys. Res. 109 (2004) B08301 10.1029/2004JB003010
38. 3 perovskite in the Earth's lower mantle. Earth Planet. Sci. Lett. 224 (2004) 241-248
39. van der Hilst R.D., de Hoop M.V., Wang P., Shim S.-H., Ma P., and Tenorio L. Seismicstratigraphy and thermal structure of Earth's core-mantle boundary region. Science 315 (2007) 1813-1817
40. Williams Q., and Garnero E.J. Seismic evidence for partial melt at the base of the Earth's mantle. Science 273 (1996) 1528-1530
41. Wright C. Array studies of P phases and the structure of the D″ region of the mantle. J. Geophys. Res. 78 (1973) 4965-4982
42. Wright C., and Lyons J.A. Further evidence for radial velocity anomalies in the lower mantle. Pure Appl. Geophys. 119 (1980) 137-162
43. Yamada A., and Nakanishi I. Detection of P-wave reflection in D″ beneath the south-western Pacific using double-array stacking. Geophys. Res. Lett. 23 (1996) 1553-1556
44. Young C.J., and Lay T. Multiple phase analysis of the shear velocity structure in the D″ region beneath Alaska. J. Geophys. Res. 95 17 (1990) 385-17, 402
45. Zhang J., and Lay T. Investigation of a lower mantle shear wave triplication using a broadband array. Geophys. Res. Lett. 6 (1984) 620-623