PSN'ers, 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? Dick __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>