The mechanism of loro frequency noise and the measures to getting the good records

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T mechanism of low frequency earth noise and the measures to getting the good recordsWe have guessed the low frequency earth noise associated with the gradientof atmospheric pressure or the force of wind, so that we observed the low frequency earth noise using a broad-band seismometer (STS-1) and observed the change of atmospheric pressure using a high sensitive barometer at lnuyama seismic station. In order to get the gradient of atmospheric pressure, we observed the change of atmospheric pressure at Nagoya city and Seto city. We analized these data and fined that the wave form of low frequency earth noise does not look like the change of atmospheric pressure gradient around the observation station, but look like the change of atmospheric pressure at lnuyama station.In addition, we fined that the big low frequency noise in the bore-hole type broad-band seismometer, however these wave form dose not look like atmospheric pressure.We came to the conclusion that the low frequency noise are a kind of the instrumental noise.