Seismické vlny v nehomogenních, slabě absorbujících, anizotropních prostředích

Wcisło, Miłosz Daniel

1 Title: Seismic waves in inhomogeneous, weakly dissipative, anisotropic media Author: Mgr. Miłosz Wcisło Department: Department of Geophysics Supervisor of the doctoral thesis: RNDr. Ivan Pšenčík, CSc Abstract: The thesis consists of two parts: theoretical and part devoted to applications. In the theoretical part, it is shown that the so-called Weak Attenuation Concept (WAC), in which attenuation is considered as a perturbation of a reference elastic state, guarantees applicability of the ray method to most models of realistic, laterally varying layered, isotropic or anisotropic attenuative media. This conclusion follows from comparisons of ray results with an independent full-wave method, which is, unfortunately, applicable only to isotropic media. Another important finding is that the so-called correspondence principle, broadly used in studies of attenuative media, must be used with care because in some situations, it may lead to incorrect results. In the part devoted to applications, the important results are presentations of successful applications of the peak-frequency method. The method is shown to be a useful tool in studying attenuation using microseismic events. It allows relatively simple estimate of the so-called global attenuation factor t*, from which estimates of attenuation can be made. In...

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