[1]WANG Wei-tao,YANG Run-hai,ZHENG Ding-chang,et al.Study on the Origin of the Body Wave Extracted from Ambient Seismic Noise Cross-correlation Function in Yunnan[J].Journal of Seismological Research,2011,34(03):0-.
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Study on the Origin of the Body Wave Extracted from Ambient Seismic Noise Cross-correlation Function in Yunnan
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
34
Number of periods:
2011 03
Page number:
0-
Column:
Public date:
2011-09-28
- Title:
- Study on the Origin of the Body Wave Extracted from Ambient Seismic Noise Cross-correlation Function in Yunnan
- Keywords:
- ambient noise; body wave signal; noise source; seasonal variation
- CLC:
- P315.3
- DOI:
- -
- Abstract:
- Using vertical component records observed at 43 broad-band seismic stations from 2008 to 2010 in Yunnan, we calculate the noise-cross correlation functions between each station-pair and obtain Raleigh surface wave in the period from 5s to 40s. We find that in the period from 5s to 10s, and before Rayleigh wave, there is a strong precursory wave whose dominant frequency band is between 0.1 Hz and 0.2 Hz and whose arrival time is near the zero of cross correlation functions. Moreover its negative arrival-time in Winter alternates with the positive ones in Summer. Through further analysis of particle-motion, we confirm that this wave is P-wave with smaller reflection angle whose apparent velocity is about 30km/s. Referring to the relevant research results, we conclude that originating from the ambient micro-tremor noise source at a teleseismic distance, P-wave travels through deep earth to Yunnan and reaches a higher apparent velocity. The ambient noise source, which locates in South Indian Ocean in Summer and North Pacific Ocean in Winter, varies seasonally and spatially.
- References:
- -
- Similar References:
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Last Update:
1900-01-01