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The study of seismic attenuation property is a major subject in seismology. Seismic waves recorded by seismic stations (seismographs) contain source effect, seismic wave propagation effect, site response of seismic stations and instrumental response. The path effect of seismic wave propagation, site response of seismic stations and instrumental response must be taken out in the study of source property with seismic data. The path effect of seismic wave propagation (seismic attenuation) involves an important influential factor, the anelastic attenuation of medium, which is measured with quality factor Q, apart from geometric attenuation with the distance. As a basic physical parameter of the Earth medium, Q value is essential for quantitative study of earthquakes and source property (e.g. determination of source parameters), which is widely used in earthquake source physics and engineering seismology. 相似文献
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Introduction Anisotropy of the crust is a common phenomenon(Crampin,1984).Shear-wave splitting can be used to study the earthquake anisotropic characteristic in crust,to analyze crustal stress field condition,and to describe the static and the dynamic state of the related anisotropic parameters(GAO et al,1999).Shear-wave splitting is quite sensitive to anisotropy.The domestic scholars applied shear-wave splitting to studying the crustal anisotropy(YAO et al,1992;GAO and FENG,1990).The st… 相似文献
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Introduction Lg wave is usually considered as one of the most prominent phases recorded by short-period or broadband seismometers in the continental area. Therefore, it is often used to determine the magnitude of regional earthquakes, the yield of nuclear explosions (Nuttli, 1986) and the horizon-tal variations of crustal attenuation. A theoretical ray approach shows that Lg is the superposition of higher-mode surface waves propagating in the continental crust (Knopoff et al, 1973; Panza and… 相似文献
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IntroductionSeismic wave is an important information source to analyze and study seismic source and internal structure of the earth. Studies of wave on different frequency ranges can provide many features of seismic source and internal structure of the earth. In recent years in quantitative study of seismic wave seismologists at home and abroad have developed a wide study field on the coda. Especially seismologists have done a lot of work in coda geneses, mechanism and its attenuation to explo… 相似文献
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川滇地区强地震活动与区域新构造运动的关系 总被引:33,自引:0,他引:33
在分析了川滇地区强震活动空间分布的非均匀性图象、震源破裂图象及震源断层力学性质等资料的基础上,讨论了该地区强震活动与区域活动断裂、活动地块现今运动状态、深部介质构造环境等的关系,对该区强震活动特征及其可能的力学机制进行了讨论. 相似文献