conclusion.tex

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\section{Conclusions}
We develop a new imaging condition based on time-shifts
between source and receiver wavefields.
This method is applicable to Kirchhoff, reverse-time and
wave-equation migrations and produces common-image gathers 
indicative of velocity errors. 
In wave-equation migration, time-shift imaging is 
more efficient than space-shift imaging, since it only involves
a simple phase shift prior to the application
of the usual imaging cross-correlation. 
Disk storage is also reduced, since the output volume
depends on only one parameter (time-shift $\tt$) instead
of three parameters (space-shift $\hh$).
We show how this imaging condition can be used to 
construct angle-gathers from time-shift gathers.
More research is needed on how to utilize this new imaging condition 
for velocity and amplitude analysis.