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There are several avenues for future research.
One obvious step is to solve for a 3-D velocity
model. This would require significantly more
events and stations than are available in
this experiment. Second, the subtraction of
the best fit plane wave from the arrival
times is less than optimal. In areas of
complex velocity this could introduce
significant travel-time errors that would
be difficult to correct.
The most interesting future research
direction is to use the steering filters
to test different geologic hypotheses.
The difference
in the reduction in the travel time errors
and the location of large values in the
regularization portion of the residual
vector would both be good indicators
of model suitability.

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Stanford Exploration Project

10/23/2004