Analysis of background noise characteristics of Xiaoquangou Seismic Station
Welch algorithm is used to calculate the power spectral density(PSD)of Xiaoquangou Seismic Station.The RMS value of the average ground motion noise is 2.88×10-9 ms for each section of the 1-20 Hz frequency band in the vertical direction of 1/3 octave,it is less than 3.16×10-8 m/s,which accords to class I standard.According to the calculated probability density function(PDF),the background noise of the Xiaoquangou Seismic Station is characterized by a significant increase in the background noise during the period from 12 to 20 o'clock and a significant decrease in the background noise at night.The annual variation of background noise was influenced by temperature and pressure,and showed a trend of low in summer and high in winter.
Xiaoquangou Seismic Stationbackground noisepower spectrum densityprobability density function
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