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Mislocation important for body waves P in particular

Mislocation important for body waves P in particular. How do we handle locations in tomography?. Iterative Relocation. Joint Inversion. Projection. Do numerical experiment. Make synthetic data for a known model but with event locations perturbed

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Mislocation important for body waves P in particular

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  1. Mislocation important for body waves P in particular

  2. How do we handle locations in tomography? Iterative Relocation Joint Inversion Projection

  3. Do numerical experiment • Make synthetic data for a known model but with event locations perturbed • Invert using the different relocation schemes and compare final models with original models • Use P data (so upper mantle is not well-constrained)

  4. Model made using projection

  5. Original model

  6. Model from iterative relocation

  7. Original model

  8. 20s P waves ordered by distance, 20--100 degrees

  9. After clustering….

  10. Diffracted Waves • Coverage of CMB poor in existing models • Diffracted waves travel along base of mantle • Lots of data

  11. Coverage with ScS-S

  12. Need to correct for effect of crust (don’t use station corrections)

  13. Shear velocity -- +-1% isovelocity surfaces Includes S and SS cluster analysis data

  14. The effect of not using surface waves on the recovery of near-surface structure

  15. Large anomalies

  16. Still large--don’t see subduction zones

  17. Little of cratons left

  18. Scale change! Subduction!

  19. Possible slabs

  20. Superplumes or plume groups

  21. Improves resolution of structure near the base of the mantle

  22. Shear velocity -- +-1% isovelocity surfaces Includes S and SS cluster analysis data

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