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Computer Aided Tomography. Tomos: cut (Gr.) Extensively used to find 3D structure from surface measurements (X-ray, sound, seismic waves). Principles of tomography. Seismic tomography. Earthquake source & receivers 3D perturbation vs 1D Earth model (PREM) Difficulties:

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computer aided tomography
Computer Aided Tomography

Tomos: cut (Gr.)

Extensively used to find 3D structure from surface measurements (X-ray, sound, seismic waves)

seismic tomography
Seismic tomography
  • Earthquake source & receivers
  • 3D perturbation vs 1D Earth model (PREM)
  • Difficulties:
    • Curved raypaths that depend on velocity
    • Poor distribution of earthquakes and receivers
    • Lack of high precision in earthquake source and time.
mantle tomography
Mantle tomography
  • E.g., Bijwaard, Spakman, Engdahl, 1999.

Subducting Farallon

slab

caveats
Caveats
  • Low resolution
  • Variable resolution
  • Artifacts of inversion & smoothing
  • Choice of 1D reference model