PSN-L Email List Message

Subject: Noise Reduction
From: Dick Webb dwebb2@..............
Date: Thu, 29 Jun 2000 19:35:03 -0400


I have a question about noise reduction.  I have 3 short period 
seismometers.  If I place them several hundred feet apart can I sum the 
signals and expect that local noise will be cancelled?  Local noise could 
be due to trees, water, wind, local traffic, etc..  Since the seismometers 
are not closely spaced, the signals would arrive at each seismometer out of 
phase with respect to the other seismometers.  Regional signals would tend 
not to be cancelled out due to their longer period.  Is this hypothesis 
correct, or is it a sand castle in front of a wave?



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Larry Cochrane <cochrane@..............>