Volume 19 Number 1
  • E-ISSN: 1365-2478



Large memory computers create new possibilities for seismic interpretation in well‐drilled areas, and more generally in problems involving deep sources.

Records obtained by well‐to‐surface, surface‐to‐well and/or well‐to‐well propagation contain a large amount of information, owing to the great number of seismic rays travelling throughout the subsurface.

This paper considers two successive steps:

— direct case: computation of the first arrival times of seismic rays propagating through a two‐dimensional subsurface with given vertical and horizontal velocity variations;

— inverse case: computation of a two‐dimensional velocity distribution, knowing the travel times of seismic rays through the subsurface.

A computer program has been elaborated to solve both direct and inverse problems. There are no difficulties with the direct case; a certain number of uncertainties remain with the inverse case.


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  • Article Type: Research Article
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