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Microlocal Analysis of Borehole Seismic Data

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RNTW01 - Rich and Nonlinear Tomography (RNT) in Radar, Astronomy and Geophysics

Borehole seismic data is obtained by receivers located in a well, with sources located on the surface, or in another well. We study approximate reconstruction of the soundspeed using linearized filtered backproection 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 geometry) 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 fold caustics in a sense that we define. In contrast, the walkawayand crosswell data sets both give rise to strong, nonremovable artifacts.

This talk is part of the Isaac Newton Institute Seminar Series series.

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