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Geophysical practice is filled with spheres and cones.
Wave fronts are spheres.
The Kirchhoff impulse response has a conical asymptote.
Surface wave noises fill a conical surface.
Likewise linear moveout in 3-D can be taken to be a conical surface.
Because of the many applications that I found for
a helix mapping of a cartesian space,
I chose to examine spheres and cones.
(To a small boy with a new hammer,
everything looks like a nail.)
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Stanford Exploration Project
4/20/1999