So far this method has worked well on a variety of simple Earth models that have been illuminated by plane waves coming from all angles in the subsurface.

Before the method is tested on real data, the following points need to be addressed:

- 1.
- A method of spatially pre-whitening upcoming waves has to be developed, so that all dips can be imaged even if the angular distribution of upcoming waves is uneven.
- 2.
- The conjecture should be tested with full wave-form modeling on more complicated Earth models (multiple dipping beds and velocities which vary both laterally and vertically, for example).
- 3.
- In order to avoid storing huge amounts of data, the cross-correlations should be done in the field in real time. Implementation of this will be difficult.

11/12/1997