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Dynamic models of earthquake source and modeling of seismicity
Kostka, Filip ; Gallovič, František (advisor) ; Matyska, Ctirad (referee)
In the present thesis we perform modeling of earthquake source using laboratory derive rate-and-state laws of friction. We have developed a code in Fortran 90 for modeling a planar, two-dimensional fault with general dip and heterogeneous distribution of frictional parameters. We use a quasi-dynamic approximation and assume that the fault is submnerged in an infinite elastic half-space. We performed an extensive number of numerical experiments to study the effect of fricitonal parameters distribution on the spatio-temporal complexity of slip on fault. We also study the effect of the so called Coulomb stress changed on clock advance and clock delay of events. For this purpose we use both a homogeneous model and a model of random frictional parameteres which exhibits the Gutenberg-Richter frequency- size dependence in the range of two magnitudes. We find that the effect of Couloumb stress change is nontrivial and depends on factors such as the domain of stress load and the slip velocity on it. Powered by TCPDF (www.tcpdf.org)
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Seismic analysis of structure with residual modes
Včelný, Michal ; Martinásek, Josef (referee) ; Vlk, Zbyněk (advisor)
This thesis deals with the possibility of using the residual shape with help of the structural analysis software SCIA Engineer in the calculation of seismic load. Residual shape will be used in combination with CQC and SRSS calculation method, including different numbers of own shapes and the oscillated mass. In the last step, the results will be compared with each other.
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Analysis of rupture velocity for selected earthquakes utilizing regional recordings of surface waves
Čejka, František ; Gallovič, František (advisor) ; Zahradník, Jiří (referee)
Supershear earthquake is an interesting phenomena that is still without a robust method for its proving. In 2012 Vallée and Dunham (2012) published a method that studied far-field waveforms from supershear earthquakes. They conclude that unilateral supershear ruptures have similar shape of surface waves on the border of Mach cone as surface waves of smaller earthquake with the similar mechanism and location. In this work we use their method and we developed a script in Python with use of ObsPy library. Our script is capable of downloading and processing data from worldwide seismic databases like IRIS. We tested our program on a supershear earthquake in 2001, Kokoxili, China, which was studied in the original paper. Our results were the same as the original one. Then we use our script to other potential supershear earthquakes: Denali 2002, Yushu 2010 and Aegean sea 2014 to test the method and its results. We conclude that this method is relatively stable for large earthquakes like Kokoxili where we have a big difference between the main shock and the small one. For smaller events there could be a problem with seismic noise and proper setting of frequention.
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Seismic activity measurement using fiber optic sensors
Vaněk, Stanislav ; Horváth, Tomáš (referee) ; Vojtěch, Josef (advisor)
The aim of master's thesis is to get familiarized with the problems of measurement and analysis of seismic waves. Theoretical part deals with the description of seismic waves, especially their types, sources and properties. Attention was afterwards focused on the measurement systems of these waves, emphasis was placed on their principles and advantages. The practical part discusses methods of noise reduction and highlighting of significant events in measured data. At the end, individual methods are implemented into user-friendly graphical interface.
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The source process of Greek earthquakes
Křížová, Dana ; Zahradník, Jiří (advisor) ; Málek, Jiří (referee) ; Šílený, Jan (referee)
Title: The source process of Greek earthquakes Author: Dana K ížová Department: Department of Geophysics Supervisor of the doctoral thesis: Prof. RNDr. Ji í Zahradník DrSc., Department of Geophysics Abstract: Investigations of moment tensor (MT) and its uncertainty are topical. This thesis is focused on isotropic component of three shallow earthquakes: Event A in Cretan Sea (Mw 5.3) and two events near Santorini island, B (Mw 4.9) and C (Mw 4.7). MT is inverted from full waveforms in an assumed 1D velocity model. The inverse problem is non-linear in centroid depth and time, and linear in six MT parameters, one is the MT-trace. Uncertainty of isotropic component is studied by a new approach (K ížová et al., 2013). The trace is systematically varied, and remaining parameters are optimized. The method reveals tradeoffs between the isotropic component, depth, time, and focal mechanism. From two existing velocity models, we prefer the one with lower condition number, in which a (positive) isotropic component is indicated for event B. To rapidly assess a likely existence of isotropic component, an empirical method is proposed (K ížová et al., 2016). It is based on comparison between depth- dependences of waveform correlation in full and deviatoric modes. Based on extensive synthetic tests, the method confirms a...
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The Reconstructions of Skopje and the Formation of Macedonian National Identity
Nedbalová, Andrea ; Králová, Kateřina (advisor) ; Žíla, Ondřej (referee)
The capital city of the Republic of Macedonia, Skopje, has undergone two important architectural changes during the last half a century. Both of these, the renewal of the city after the devastating earthquake of 1963 and the extensive architectural project "Skopje 2014" launched in 2010, included content which focused on the formation of Macedonian national identity. The diploma thesis The Reconstructions of Skopje and the Formation of Macedonian National Identity analyses how architecture and urbanism was used to form Macedonian national identity. As these two events had very different initial conditions, the nature of these reconstructions, together with the promoted visions of national identity and their presentation, differed considerably. The rebuilding of Skopje after the earthquake presented Macedonian national identity to a greater extent through a strong ideological content based solely on visions of the future. In comparison, the project "Skopje 2014" presented an interpretation of national identity through specific symbols. This construction was based on the interpretation of historical events, resulting in a new understanding of the historical continuity of the Macedonian nation. The fact that two vastly different visions of Macedonian national identity, presented through the recreation...
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Dynamic models of earthquake source and modeling of seismicity
Kostka, Filip ; Gallovič, František (advisor) ; Matyska, Ctirad (referee)
In the present thesis we perform modeling of earthquake source using laboratory derive rate-and-state laws of friction. We have developed a code in Fortran 90 for modeling a planar, two-dimensional fault with general dip and heterogeneous distribution of frictional parameters. We use a quasi-dynamic approximation and assume that the fault is submnerged in an infinite elastic half-space. We performed an extensive number of numerical experiments to study the effect of fricitonal parameters distribution on the spatio-temporal complexity of slip on fault. We also study the effect of the so called Coulomb stress changed on clock advance and clock delay of events. For this purpose we use both a homogeneous model and a model of random frictional parameteres which exhibits the Gutenberg-Richter frequency- size dependence in the range of two magnitudes. We find that the effect of Couloumb stress change is nontrivial and depends on factors such as the domain of stress load and the slip velocity on it. Powered by TCPDF (www.tcpdf.org)
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Mineral waters in the Bad Brambach - Skalná area, the current knowledges.
Turnová, Štěpánka ; Goliáš, Viktor (advisor) ; Hrkal, Zbyněk (referee)
This paper summarizes the findings of the mineral waters around Skalná - Bad Brambach. Bad Brambach are radon spa that work here since 1912. Source Wettinquelle is one of the strongest radon springs in the world. Around Skalná is anomalous quantities of uranium, however, that there occurs in such small particles that netěžitelné. Radon is a decay product of U238 series. Within the study area is also NPR Soos, who is known moffetes, but there also are so-called diatomaceous peak which is a dry salt lake containing diatoms. Area of the Nový Kostel is the area with the most frequent occurrence of earthquakes in the Czech Republic. Several earthquake swarms were recorded as well as the local populations. Recent earthquake activity has been recorded in 2011. There are also several other spa municipal Františkovy lázně, Mariánske lázně, Karlovy Vary and other radon baths, which already are but a little further, Jáchymov.
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