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SUMMARY:Microlocal Analysis of Borehole Seismic Data - Clifford Nolan (Uni
 versity of Limerick)
DTSTART:20230131T110000Z
DTEND:20230131T114500Z
UID:TALK194515@talks.cam.ac.uk
DESCRIPTION:Borehole seismic data is obtained by receivers located in a we
 ll\, with sources located on the surface\, or in another well. We study ap
 proximate reconstruction of the soundspeed using linearized filtered backp
 roection for three types of data sets. The sources may form a dense array 
 on the surface\, or be located along aline on the surface (walkaway geomet
 ry) or in another borehole (crosswell). We show that for the dense array\,
  reconstruction is feasible\, with no artifacts in theabsence of caustics 
 in the background ray geometry\, and mild artifacts in the presence of fol
 d caustics in a sense that we define. In contrast\, the walkawayand crossw
 ell data sets both give rise to strong\, nonremovable artifacts.
LOCATION:Seminar Room 1\, Newton Institute
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