Thanks,

My old and hated statistics class is coming back to me.  I agree that I 
could filter or band pass most of the noise.  My interest in combining the 
seismometer outputs arose mainly because I have the 3 seismometers and I 
wanted to get the most from them (I'm the guy who hoped that you could 
convert a vertical to horizontal).  If it is possible to combine the 
outputs after signal processing, why would it not be possible to do it with 
the raw signals, i.e. directly out of the units.  Wouldn't you be looking 
as a sum of the voltages?

Dick

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