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The aim of the project was to demonstrate the interpretation of seismic reflection data by modelling the propagation of elastic waves inside the Earth, and to identify the model which predicts the best synthetic seismograms. It is shown that it is possible to invert real data and to obtain better images of the Earth's crust than with conventional techniques. Full non-linear methods of inversion are used. The forward and inverse problems are solved without using the Born approximation, i.e. without neglecting multiply reflected energy or evanescent waves and without assuming "good" starting models. Two very smooth images are retrieved at wavelengths greater than 300 m, corresponding to the seismic velocities, and two more rough images at wavelengths in the range 20-80 m, corresponding to the contrasts of seismic impedances. The seismic inverse problem is formulated as an optimisation problem. This is elastic rather than acoustic, and may account for attenuation. Considerable theoretical work on the solution of highly non-linear inverse problems using simulated annealing techniques is included.

Additional information

Authors: TARANTOLA A, Université de Paris 6 et 7, Institut de Physique du Globe de Paris, Paris (FR)
Bibliographic Reference: EUR 13800 EN (1991) 531 pp., MF, ECU 24
Availability: (2)
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