A method is given for determining the boundary of a salt dome, based upon first-arrival time measurements of seismic waves from ordinary shotpoints distributed around the dome and received by a well detector within a deep hole flanking the dome. The three-dimensional problem of locating the dome boundary, taking account of radial and vertical changes of velocity within the surrounding sedimentary section, is solved by the determination of vertical and horizontal cross sections of 'aplanatic surfaces' as set forth. A practical procedure for such a survey is briefly outlined.

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