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SUMMARY:Some applications of least-squares inversion in exploration geophy
 sics - Plessix\, R-E (Shell Global Solutions International)
DTSTART:20111214T090000Z
DTEND:20111214T093000Z
UID:TALK34953@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:In exploration geophysics\, we often obtain subsurface images 
 from the data we record at the surface of the Earth. This imaging problem 
 can be formulated as a data misfit problem. However\, we face a number of 
 numerical challenges when we want to apply this approach with seismic or e
 lectromagnetic data. We first need to efficiently compute some approximati
 ons of the elastodynamic or electromagnetic equations. Secondly\, we need 
 to solve the inverse problem with a local optimization because of the larg
 e problem size.  During this presentation\, after having briefly discussed
  the numerical solutions of the partial differential equations governing t
 he physics\, we shall describe the inverse formulation. Then\, we shall pr
 esent some of the applications and the difficulties we encounter in practi
 ce.\n
LOCATION:Seminar Room 1\, Newton Institute
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