Hello PSN;

I just this morning took a 4.5LB avdp. plumbum (lead) weight out and sat it next to
my geophone (geophone is resting 2ft underground) suspended on a vertical spring.
As I was recording I sat the mass vertically oscillating up and down at about a
one second period.

I saw no signal.

Only myself moving about made any signals at all.


From this little test I can guess it will
take like a 100 lb or more weight
suspended on a spring to get a decent signal.

I'm talking vertical and not horizontal.


Does anyone know how to inject a signal into
the ground at 1Hz to test your system ??

If so how to do ?

??geoff?? 
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