Bob Crantz wrote:



Good job on catching the distinction. A fine point that only a learned,
diligent man such as yourself would catch.

Try this link:

http://quake.wr.usgs.gov/research/ph...shearwave.html



Well shucks, thanks. Let's patent this idea PDQ, must be tens of dollars
to be made selling this gizmo to budding marine surveyors!

Cheers
Marty