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

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Presentation transcript:

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 forward modelling of waveforms

Shen et al., 1999 ICELAND PLUME

Allen et al., 2002 Iceland

Shen et al., 1998

Li, Kind et al., 2004

Montelli et al., 2004

KH2000 Tokyo’98 SAW24B16 Montelli et al., 2004

Karason and van der Hilst, 2000

Long wavelength S velocity model SAW24B16 Mégnin and Romanowicz, 2000

Depth = 250 km Panning and Romanowicz, 2004 Radial Anisotropy

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

Mégnin and Romanowicz, 2000

Anelastic attenuation: QRLW8 Gung and Romanowicz, 2003

Q: Centered on Africa

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

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

Ekström and Dziewonski, 1998

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

Montagner and Tanimoto, 1991

MNST African “superplume” Elastic SAW24B16 Q -1

Panning and Romanowicz, 2004

Panning and Romanowicz,,2004 ISOTROPIC VELOCITY ANISOTROPY

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

Forward modelling of fine scale structure

Toh et al. 2004

CSEM Synthetics Toh et al. 2004

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 !!