Re: Depth finder for ground imaging

On Sun, 14 May 2006 16:46:24 +0000, Ken Smith wrote:

In article <446717c3$1@xxxxxxxxxxxxxxxx>,
bruce varley <bxvarley@xxxxxxxxxxxxxxx> wrote:
[....]
Many years ago I tried to detect caves using this technique. It didn't work,
soil is a pretty poor medium for conducting sound at any frequency.

Anyone who lives in earthquake country knows this isn't true. The energy
in an earthquake is sound.

Also, there is an entire seismic industry based on the fact that soil is a
good conductor of sound.


So stick a bunch of microphones in the ground, and wait for an earthquake. ;-)

Cheers!
Rich


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