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How can seismology help constrain the nature of plumes and upwellings?

How can seismology help constrain the nature of plumes and upwellings?. Barbara Romanowicz UC Berkeley. CIDER’04-KITP. Possible seismological approaches. Local tomography Converted phases/receiver functions Global tomography elastic velocity, anisotropy, attenuation

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How can seismology help constrain the nature of plumes and upwellings?

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  1. How can seismology help constrain the nature of plumes and upwellings? Barbara Romanowicz UC Berkeley CIDER’04-KITP

  2. Possible seismological approaches • Local tomography • Converted phases/receiver functions • Global tomography • elastic velocity, anisotropy, attenuation • forward modelling of waveforms

  3. ICELAND PLUME Shen et al., 1999

  4. Iceland Allen et al., 2002

  5. Shen et al., 1998

  6. Shen et al., 1998

  7. Li, Kind et al., 2004

  8. Montelli et al., 2004

  9. Montelli et al., 2004

  10. KH2000 Tokyo’98 SAW24B16 Montelli et al., 2004

  11. Karason and van der Hilst, 2000

  12. Long wavelength S velocity model SAW24B16 Mégnin and Romanowicz, 2000

  13. Radial Anisotropy Depth = 250 km Panning and Romanowicz, 2004

  14. Correlation between strength of radial anisotropy and spreading rate Open symbols:250km Filled symbols:300km diamonds: MAR circles: EPR Panning and Romanowicz, 2004

  15. Mégnin and Romanowicz, 2000

  16. Anelastic attenuation: QRLW8 Gung and Romanowicz, 2003

  17. Q: Centered on Africa

  18. AB CD Hawaii Q-1 “Pacific Superplume” Romanowicz and Gung, 2002

  19. Correlation of Q-1 with spreading rate EPR Romanowicz, 1994, EPSL

  20. Ekström and Dziewonski, 1998

  21. Under Pacific: transverse isotropy versus Q Anisotropy versus attenuation Hawaii Central Pacific

  22. Montagner and Tanimoto, 1991

  23. MN ST Q-1 Elastic SAW24B16 African“superplume”

  24. Panning and Romanowicz, 2004

  25. ISOTROPIC VELOCITY ANISOTROPY Panning and Romanowicz,,2004

  26. Sharp boundary of the African Superplume Ni et al., 2002

  27. Forward modelling of fine scale structure

  28. Toh et al. 2004

  29. CSEM Synthetics Toh et al. 2004

  30. Conclusions • Combination of elastic, anelastic and anisotropic tomography at the global scale can help constrain large scale flow - in particular the morphology of upwellings • Need a very large aperture array centered in the Pacific ocean !!

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