[1]WANG Jun,XU Ge,SUN Ye-jun.Analysis on Background Seismic Noise Characteristics in Jiangsu Province[J].Journal of Seismological Research,2009,32(02):155-161.
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Analysis on Background Seismic Noise Characteristics in Jiangsu Province
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
32
Number of periods:
2009 02
Page number:
155-161
Column:
Public date:
2009-02-23
- Title:
- Analysis on Background Seismic Noise Characteristics in Jiangsu Province
- Keywords:
- digital seismic station; background seismic noise; power spectral density; Jiangsu Province
- CLC:
- P315.72
- DOI:
- -
- Abstract:
- In this paper,we adopted the Welch's method to estimate background noise velocity power spectral density(PSD)of the seismic stations in Jiangsu province at the range from 0.01s to 20Hz.We found that there are two dominant peaks at the periods T≈10-16 s、T≈4-8 s respectively.And the day/night spectral ratios of surface seismic stations show that the strongest variation for three components is at the frequency range ≥1 Hz,the ratio variations at the 0.125-1 Hz are not distinguished,and the day noise level of the vertical component are lower than the night time noise at the range of low frequency range(≤0.125 Hz),the horizontal components are reverse.At the same time,there is little change for day/night spectral ratios of boreholes stations at all frequency sections.In additional,we also discussed seismic noise characteristic on the terrain difference of Jiangsu,the results show that the southern Jiangsu –Shanghai region has significantly higher noise level than mid-northern at the high frequency range(2-16 Hz),which is about 45 dB higher than the NLNM.At 0.125-1 Hz,the mid-eastern region has higher noise than other region,these are considered to be caused by geological difference.
- References:
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Last Update:
2009-02-23