小近震三分向地震图S波记录振幅包络形状及Q值测定
ENVELOPE FORM OF THE AMPLITUDE RECORDING OF WAVES OF THREE COMPONENT SEISMOGRAMS OF SMALL NEAR EARTHQUAKES AND THE DETERMINATION OF Q-VALUE
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摘要: 本文采用三层地壳介质模型,讨论了地方台网记录的小近震三分向地震图S波段振幅包络形状问题.认为S波包络的规则形状主要是由于强反射界面上的一次和多次全反射波形成的.分析了地壳分层结构,震源辐射特性,介质衰减对n次全反射波振幅的影响.在此基础上,从理论上给出了从直达S波到尾波之间的S波段记录部分振幅包络形状函数和S波最大振幅.利用包络形状函数方法测定了宁夏地区介质品质因素Q值.Abstract: In this paper,using a three layer model of the crustal media,the amplitude envelopes of S-waves of three component seismograms of small near earthquakes recorded by the local seismic network are studied. And we think that the regular shape of the amplitude envelope of S-waves are formed from the once-and multiple total reflections of waves at the main reflection plane. The influence of crustal layering,radiant chracteristics of the source and attenuation of crustal media on the envelope form of S-waves are analysed. On this basis,the form function of the amplitude envelope of S-waves in between the direct S-wave and the coda and the maximum amplitude of S-waves are given by theoretical calculation. Using the method of the form function of the envelope,the Q-value of crustal media in the Ningxia region is determined.
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[2] 冯锐、朱介寿、丁楹玉、陈国英、何正勤、杨树彬、周海南、孙克忠,1981.利用地震面波研究中国地壳结构.地震学报,3, 335——349,
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[4] Ьреховских,д,M.,1957, Волны в слоцстых сребах,Москва.[1] 杨明芝、张文孝、赵和云,1984.近距离地震垂直向记录的早至S波振幅一时间特性的研究.华北地震科学,2, 4, 40——47,
[2] 冯锐、朱介寿、丁楹玉、陈国英、何正勤、杨树彬、周海南、孙克忠,1981.利用地震面波研究中国地壳结构.地震学报,3, 335——349,
[3] Ewing, W. M., Jardetzky, W. S, and Press, F., 1957. Elastic Waves in layered Media, New York.
[4] Ьреховских,д,M.,1957, Волны в слоцстых сребах,Москва.
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