Artefacts & Optical Illusions in Tomography
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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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Artefacts optical illusions in tomography

Artefacts & Optical Illusions in Tomography

With emphasis on the roles of slabs, backarc basins, volatiles & cratonic roots


Artefacts optical illusions in tomography

FACE


Artefacts optical illusions in tomography

The optical illusion of inversion. Is yellow hot or just not cold?

What is the ambient color?


Artefacts optical illusions in tomography

HOT COLORS ARE COLD MANTLE


Artefacts optical illusions in tomography

Shallow anisotropy & heterogeneity can bleed into the lower mantle

No plumes

One cause of vertical streaking artefacts

(there are many)

Multiple plumes


Artefacts optical illusions in tomography

Relative vs. absolute wavespeeds

Add the reference model back in


Artefacts optical illusions in tomography

Absolute wavespeeds

Absolute wavespeeds


Artefacts optical illusions in tomography

Relative wavespeeds


Artefacts optical illusions in tomography

Plumes under California, slab under Yellowstone?


Artefacts optical illusions in tomography

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.


Artefacts optical illusions in tomography

Actual anomalies are ~2.5 times larger


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