Sean-Thomas --

Thanks for the repeat and your great description of displacement and
velocity vs distance and magnitude.  Do these equations still hold in the
very near field?

My reason for asking is that there is some blasting going on about 1/4 mile
away and about 200 feet higher in elevation from here, and I would like to
be able to take advantage of what I record to the greatest extent I can.  I
am recording in both velocity and acceleration, and I am going to increase
the digitizing rate to 100sps.  I can appreciate that the coefficients of
the equations probably depend on what's below the surface (in this case
granite, hence the blasting).  Would I be able to see echos from nearby
discontinuities?

All comments are welcome.

Karl
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