Translations:Velocity analysis - book/8/en

In many cases, it is necessary to estimate subsurface velocities by measurements confined to the surface because boreholes are not always conveniently available. In such cases, the actual seismic data must be used to estimate velocities. A well-established method estimates by considering the time differentials for the same event as it is received by a lateral array of detectors. Any such estimate always depends on a ceteris paribus (other things being equal) assumption.