Caveats on Tomographic Images Gillian R. Foulger, Giuliano F. Panza, Irina M. Artemieva, Ian D. Bastow, Fabio Cammarano, John R. Evans, Warren B. Hamilton,

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Presentation transcript:

Caveats on Tomographic Images Gillian R. Foulger, Giuliano F. Panza, Irina M. Artemieva, Ian D. Bastow, Fabio Cammarano, John R. Evans, Warren B. Hamilton, Bruce R. Julian, Michele Lustrino, Hans Thybo, Tatiana B. Yanovskaya Durham Univ., U.K., Univ. Trieste, Italy, Earthquake Administration, Beijing, China, Univ. Copenhagen, Denmark, Imperial College, London, U.S. Geological Survey, U.S.A., Colorado School of Mines, U.S.A., Univ. degli Studi di Roma La Sapienza, Italy, Sankt- Petersburg State Univ., Russia

Caveats on Tomographic Images Gillian R. Foulger, Giuliano F. Panza, Irina M. Artemieva, Ian D. Bastow, Fabio Cammarano, John R. Evans, Warren B. Hamilton, Bruce R. Julian, Michele Lustrino, Hans Thybo, Tatiana B. Yanovskaya Terra Nova, 25, , 2013

Teleseismic Tomography Structure outside the study volume cannot be ignored Evans & Achauer (1993)

Teleseismic Tomography Absolute velocities are not obtained Evans & Achauer (1993)

Teleseismic Tomography Variations in the vertical are not calculated Evans & Achauer (1993)

Vertical Smearing Eken et al. (2008)

Anomaly Amplitudes Heavily dependent on inversion parameters – Damping factors – Model smoothness – Parameterization of model – Depth to base of block – ± station corrections – Crust used Eken et al. (2008)

O’Donnell et al. (2011)

(Figure provided by Jeroen Ritsema and published in Hamilton, 2011). Inhomogeneous Ray Coverage

Montelli et al. (2004; 2006) Li et al. (2008) Wolfe et al. (2009) NW SE

Reference Models Foulger et al. (2013)

Geochemistry Assumptions about tomography lead to assumptions about geochemistry Cannot be assumed: – CMB “slab graveyard” – “superplumes” are hot No tomographic support for: – High- 3 He/ 4 He, radiogenic basalts from CMB

The Way Forward Publish seismic models on web, with errors Integrate seismology & geochemistry where each has power: – e.g., LVZ = depth where pargasitic amphibole unstable – Suggests melt present

Caveats on Tomographic Images Gillian R. Foulger, Giuliano F. Panza, Irina M. Artemieva, Ian D. Bastow, Fabio Cammarano, John R. Evans, Warren B. Hamilton, Bruce R. Julian, Michele Lustrino, Hans Thybo, Tatiana B. Yanovskaya Terra Nova, 25, , 2013