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Rozložení zdrojů šumu zaznamenaných stanicemi sítě WEBNET a rychlostní model šíření S-vln ve svrchní kůře seismoaktivní oblasti západních Čech získaný na základě seismické interferometrie. / Distribution of noise sources recorded by the WEBNET network and the uppermost S-wave velocity model in the West Bohemia seismoactive region based on seismic interferometry.Mityska, Martin January 2014 (has links)
The master's thesis consists of two parts. The first part contains the azimuth -- slowness analysis for period 3s<=T<=6s, which was conducted by the FK analysis for 10 stations of the WEBNET network. In the second part there is the surface wave group velocity measurement for every station pair of 10 WEBNET stations. The interstation group velocity was obtained by the cross--correlation of microseismic noise records. Local group velocities are connected with the instantaneous period data. The Love wave group velocities are visualised by the 2D tomography calculation. The thesis also contains the additional Love waves dispersion analysis for just one station pair. Powered by TCPDF (www.tcpdf.org)
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Využití a interpretace seismických povrchových vln v širokém oboru frekvencí / Application and interpretation of seismic surface waves in broad frequency rangeGaždová, Renata January 2012 (has links)
Submitted Ph.D. thesis is concerning the application and interpretation of seismic surface waves in a broad range of frequencies and scales. Using surface waves as a supplement to the methods dealing with body waves seems to be worth the effort. Surface wave interpretation can be used to obtain new information about the studied medium and simultaneously it can overcome, in some cases, the limitations of other seismic techniques. Moreover, surface waves are usually present on measured records and hence for its usage it is not necessary to modify the standard measuring procedures. One of the results of this thesis is an original algorithm for dispersive waveform calculation. The program works in an arbitrary range of frequencies and scales. The input parameter for the calculation is the dispersion curve. In this point the algorithm differs from all other approaches used so far. Algorithm is based on a summation of frequency components with shifts corresponding to the velocity dispersion and distance. The resulting waveform only contains an individual dispersive wave of the selected mode, thus being particularly suitable for testing of methodologies for dispersive wave analysis. The algorithm was implemented into the program DISECA. Furthermore, a new procedure was designed to calculate the dispersion...
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