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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). Principles of tomography. Seismic tomography. Earthquake source & receivers 3D perturbation vs 1D Earth model (PREM) Difficulties:

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Computer Aided Tomography

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  1. Computer Aided Tomography Tomos: cut (Gr.) Extensively used to find 3D structure from surface measurements (X-ray, sound, seismic waves)

  2. Principles of tomography

  3. 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.

  4. Mantle tomography • E.g., Bijwaard, Spakman, Engdahl, 1999. Subducting Farallon slab

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

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