[1]ZHANG Yan,ZHENG Dingchang,LIN Guoliang,et al.Analysis on Ambient Noise Origin in Yunnan Area Based on Three-Component Data[J].Journal of Seismological Research,2020,43(04):689-700.
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Analysis on Ambient Noise Origin in Yunnan Area Based on Three-Component Data
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
43
Number of periods:
2020 04
Page number:
689-700
Column:
Public date:
2020-09-17
- Title:
- Analysis on Ambient Noise Origin in Yunnan Area Based on Three-Component Data
- Keywords:
- empirical Green's function; cross-correlation; SNR; the ambient noise origin; ocean activity
- CLC:
- P315.6
- DOI:
- -
- Abstract:
- The characteristics of ambient noise and the distribution of the ambient noise origin have gradually become the key issues to deepen the research in the empirical Green's function.Based on the three-component continuous record of 48 seismic stations in Yunnan area from 2015 to 2016,we extracted the empirical Green's function of stations by using cross-correlation calculation.Based on the characteristics of the signal-to-noise(SNR)ratio of the positive and negative branches of the cross-correlation function,combined with the wave height data,we obtained the azimuthal distribution and time variation characteristics of SNR of stations between 5～10 s,10～20 s,20～40 s in Yunnan area.The results show that the principal azimuth of the ambient noise origin of three-component in Yunnan area are different in different periods.For the 5～10 s band,it is relatively stable.When the ocean activity is relatively intense,the ZZ and RR components are easier to be affected than the TT components.For the 10～20 s band,it is consistent with the seasonal variability of the ocean activities.The principal azimuths of ZZ and RR components points to E and WS direction from Jan.to Jun.,while that of TT component mainly points to E direction.The principal azimuths of ZZ and RR components point to WS from Jul. to Dec., while that of TT component points to WS from Jul.to Dec.,E and WS direction from Oct. to Dec.For the 20～40 s band,the noise intensity is smaller and stable with time.Therefore,the ambient noise origin in Yunnan area is likely to be related to the activities of North Pacific Ocean and Bengal Bay-Andaman Sea-North Indian Ocean.
- References:
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Last Update:
2020-09-17