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《Journal of The University of Petroleum,china》 2002-01
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MEASUREMENT OF THREE-DIMENSIONAL DYNAMIC FREQUENCY SPECTRA OF INFRASONIC WAVES PRODUCED BY WINDS WITH 4-8 WIND SCALES

SU Fang, TIAN Wei (Department of Basic Sciences in the University of Petroleum, China, Beijing, 102200)  
Three infrasonic receivers arranged in a tripartite array were used to measure the frequency spectra of infrasonic waves of high winds in Changping County of Beijing. The infrasonic waves produced by high winds, including wind scale 4(twelve times), wind scale 5(ten times), wind scale 6(five times), wind scale 7(three times) and wind scale 8(two times) were observed from the January to April in 2000. The corresponding three dimensional dynamic frequency spectra were obtained using fast Fourier transformation. The spectrum analyses show that high winds with 4 8 wind scales can produce infrasonic waves with larger amplitude and a measurable direction. These waves possess three similar characteristics different from precursory infrasound of strong earthquakes. There are lots of short periods of 1 5(or 8, 10,12,15) minutes and some long periods of 30 65 minutes at the same time. In every third moment or so, the short periods could join the long periods together. The larger the wind power is, the more the joining frequency will be. The average of strong amplitudes of the three dimensional dynamic frequency spectra produced by winds is on the increase with the enhancement of the wind force. The experiential expressions could be applied to estimate the wind scale using the three dimensional dynamic spectra of infrasonic waves.
【Fund】: 石油大学 (北京 )校基础研究基金资助项目 (99 I 0 2 )
【CateGory Index】: O425.2;O425.3;P457
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1 SU Fang and SU Xiao/ / 2000,24(6):106~112graduated from Peking University in 1967. He received MS degree from the University of Science and Technology of China in 1981. Now he is a professor and works on infrasonics and ultrasonics at the Department of;PRECURSORY INFRASOUND FOR PREDICTING STRONG EARTHQUAKE[J];Journal of The University of Petroleum,china;2000-06
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