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Artefacts & Optical Illusions in Tomography

Artefacts & Optical Illusions in Tomography. With emphasis on the roles of slabs, backarc basins, volatiles & cratonic roots. FACE. The optical illusion of inversion. Is yellow hot or just not cold?. What is the ambient color?. HOT COLORS ARE COLD MANTLE.

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Artefacts & Optical Illusions in Tomography

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  1. Artefacts & Optical Illusions in Tomography With emphasis on the roles of slabs, backarc basins, volatiles & cratonic roots

  2. FACE

  3. The optical illusion of inversion. Is yellow hot or just not cold? What is the ambient color?

  4. HOT COLORS ARE COLD MANTLE

  5. Shallow anisotropy & heterogeneity can bleed into the lower mantle No plumes One cause of vertical streaking artefacts (there are many) Multiple plumes

  6. Relative vs. absolute wavespeeds Add the reference model back in

  7. Absolute wavespeeds Absolute wavespeeds

  8. Relative wavespeeds

  9. Plumes under California, slab under Yellowstone?

  10. In contrast to global reference models, the actual Earth has a global LVZ between 600 and 650 km. Correcting to this new reference turns the red patches above 650 into pale blue or neutral patches & blue regions into flat slab like anomalies. 1000 km The pale yellow areas become slightly positive when a background reference model with slabs at 650 km is added back in and the blue regions above 650 become bluer.

  11. Actual anomalies are ~2.5 times larger

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