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SUMMARY:Towards a more robust automatic velocity analysis method - Chauris
 \, H (Mines Paris Tech)
DTSTART:20140214T090000Z
DTEND:20140214T094500Z
UID:TALK50885@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Co-author: C.-A. Lameloise (MINES ParisTech)\n\nIn the context
  of seismic imaging\, we analyse artefacts related to a classical objectiv
 e functional\, the "Differential Semblance Optimization" approach (DSO). T
 his functional has been defined to automatically retrieve a velocity model
  needed to image complex structures with seismic waves. In practice\, it m
 ay fail due to the presence of a number of artefacts. \n\nWe propose two c
 omplementary approaches: first\, we give evidence that a quantitative migr
 ation scheme is useful to compensate for uneven subsurface illumination. S
 econd\, we propose to slightly modify the objective function such that its
  gradient does not exhibit spurious oscillations for models containing int
 erfaces or discontinuities. \n
LOCATION:Seminar Room 1\, Newton Institute
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