Extracting the Group Velocity of Rayleigh Waves from the Cross Correlation of the Ambient Seismic Noise Between Two Seismic Stations |
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Authors: | Jin Xing Li Jun Lin Shu Zhou Zhengrong Kang Lanchi and Ou Yiping |
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Institution: | Earthquake Administration of Fujian Province,Fuzhou 350003,China;Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Fuzhou University,Fuzhou 350002,China;;Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China;Earthquake Administration of Fujian Province, Fuzhou 350003, China;Earthquake Administration of Fujian Province, Fuzhou 350003, China;Fuzhou University, Fuzhou 350002, China;Fuzhou University, Fuzhou 350002, China |
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Abstract: | This paper uses the 8 broad-band stations' microseism data recorded by the Seismic Monitoring Network of Fujian Province to calculate the vertical correlation coefficient between two stationsat intervals of 5 minutes. According to the time intervals technique we obtain the different coefficients and then add the correlative coefficients. Depending on this, we extract the group velocity of Rayleigh waves from the cross correlation of the ambient seismic noise between two seismic stations and figure out the group velocity' spatial distribution. The results show that the signal noise ratio (SNR) increases proportionally to the superposition times, but the results from different days are similar to one another. Synchronously, the arrival-time is also stable and there is no obvious change when coming across typhoons. It is found the velocity of the surface wave is 2.9~3. 1km/s in Fujian Province, which is close to the observationally attained value. |
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Keywords: | Microseisms Correlation Rayleigh wave Group velocity Green-function |
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