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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Změna využití ploch na Chebsku - nová divočina / Land use change in the Cheb area - new wilderness

Pekárková, Hana January 2019 (has links)
The theses deals with exploration of new wilderness which comes into being in abandoned areas in border regions in the Cheb district. Using the newly defined transformation index, two cadastral territories in the district were identified with the highest probability of new wilderness occurence. The occurrence of a new wilderness was demonstrated in both cadastral areas and was categorized into typology already established. Photographs and ArcGis maps were added to the field survey. Post-habitat and post-agrarian new wilderness were identified in both cadastral territories. Further, there were identified post-montane and post-aquatic new wilderness. Despite the position near the border, where the Iron Curtain was located, post- military new wilderness was not identified there. New wilderness occurs in both localities on more than 10 % of area. Keywords: Land use, change of landscape, new wilderness, West Bohemia
2

Tensile source components of swarm events in West Bohemia in 2000 by considering seismic anisotropy

Rößler, Dirk, Krüger, Frank, Rümpker, Georg, Psencik, Ivan January 2006 (has links)
Earthquake swarms occur frequently in West Bohemia, Central Europe. Their occurrence is correlated with and propably triggered by fluids that escape on the earth's surface near the epicentres. These fluids raise up periodically from a seemingbly deep-seated source in the upper mantle. Moment tensors for swarm events in 1997 indicate tensile faulting. However, they were determined under assumption of seismic isotropy although anisotropy can be observed. Anisotropy may obscure moment tensors and their interpretation. In 2000, more than 10,000 swarm earthquakes occurred near Novy Kostel, West Bohemia. Event triggering by fluid injection is likely. Activity lasted from 28/08 until 31/12/00 (9 phases) with maximum ML=3.2. High quality P-wave seismograms were used to retrieve the source mechanisms for 112 events between 28/08/00 and 30/10/00 using > 20 stations. We determine the source geometry using a new algorithm and different velocity models including anisotropy. From inversions of P waves we observe ML<3.2, strike-slip events on steep N-S oriented faults with additional normal or reverse components. Tensile components seem to be evident for more than 60% of the processed swarm events in West Bohemia during the phases 1-7. Being most significant at great depths and at phases 1-4 during the swarm they are time and location dependent. Although tensile components are reduced when anisotropy is assumed they persist and seem to be important. They can be explained by pore-pressure changes due to the injection of fluids that raise up. Our findings agree with other observations e.g. correlation of fluid transport and seismicity, variations in b-value, forcing rate, and in pore pressure diffusion. Tests of our results show their significance.
3

Small-aperture seismic array monitors Vogtland earthquake swarm in 2008/09

Rößler, Dirk, Hiemer, Stephan, Bach, Christoph, Delavaud, Elise, Krüger,Frank, Ohrnberger, Matthias, Sauer, David, Scherbaum, Frank, Vollmer, Daniel January 2009 (has links)
The most recent intense earthquake swarm in the Vogtland lasted from 6 October 2008 until January 2009. Greatest magnitudes exceeded M3.5 several times in October making it the greatest swarm since 1985/86. In contrast to the swarms in 1985 and 2000, seismic moment release was concentrated near swarm onset. Focal area and temporal evolution are similar to the swarm in 2000. Work hypothysis: uprising upper-mantle fluids trigger swarm earthquakes at low stress level. To monitor the seismicity, the University of Potsdam operated a small aperture seismic array at 10 km epicentral distance between 18 October 2008 and 18 March 2009. Consisting of 12 seismic stations and 3 additional microphones, the array is capable of detecting earthquakes from larger to very low magnitudes (M<-1) as well as associated air waves. We use array techniques to determine properties of the incoming wavefield: noise, direct P and S waves, and converted phases.
4

Amenitní migrace a její formy v oblasti západních Čech / Amenity migration and its forms in the region of West Bohemia

ŠVEJDOVÁ, Kateřina January 2012 (has links)
The main objective of this thesis is to determine the model assumptions (Western Bohemia region-Planá, Marianské Lázně and Tachov) for the establishment and existence of the phenomenon of "amenity migration". This finding will determine the main reasons why amenity migrants moving to this area and what is their involvement in local life.
5

Kvalita vody a vodácká turistika na vybraných západočeských řekách / Quality of water and water touring on selected West Bohemia rivers

Šimice, David January 2010 (has links)
3 Abstract Title: Quality of water and water touring on selected West Bohemia rivers Aim: The main aim of the thesis was to find out if there are changes of water quality in the most significant West Bohemia rivers as a result of the changing approach to our environment in the past several years. Furthermore, to consider whether the water quality has changed in relation to finished water management projects and whether this change influenced using rivers for water touring. The observed rivers: Úhlava, Úslava, Radbuza, Mže, Berounka and Střela. Methods: The first part of the thesis, discussing the water quality, analyzes available data collected from written and electronic resources and discussions with experts. The gained material mostly within the last 10 years was organized, compared and summarized. The second part brings the evaluation by canoeists who regularly canoe down these rivers and can visually judge the water quality. This information was interpreted from semi- structured interviews with canoeists. Results: Our presumption that the water quality on the selected West Bohemia rivers is improving was proved, which is one of basic conditions for water touring as well. Keywords: West Bohemia rivers, water touring, water quality, pollution
6

Rozhraní kůra/plášť v geodynamické oblasti západních Čech / The crust/mantle boundary in geodynamically active area of West Bohemia

Podolník, Jan January 2017 (has links)
The region of West Bohemia is one of the most geodynamically active areas of Central Europe. The activity is characterized by many natural phenomena such as recurrent seismic swarms. The crustal structure of the region was subject of many geophysical investigations that revealed increased reflectivity of the lower crust. In this thesis, we adapt the multi-azimuthal approach for the detection of crustal discontinuities developed by Hrubcov'a et al. (2013). We apply the ap- proach on waveforms of the 2000 and 2008 swarms that occurred in the Nov'y Kos- tel focal area registered by several German stations. Analysis of the data of more distant German stations allowed expanding of the information about the depth and character of the crust/mantle transition in a broader area of the West Bo- hemia region. The results show a thickening of the zone in Germany with in- creasing distance from the epicentral area. Such findings are in agreement with previous active and passive seismic experiments.
7

Skupina pozdně románských kostelů v severozápadních Čechách / The group of late-romanesque churches in north-western Bohemia

Kostrounová, Tereza January 2012 (has links)
This thesis examines a group of late Romanesque churches, most of which are to be found in north-western Bohemia. The thesis is divided into two parts. In the first part I survey the most important literature on the subject, and analyse the appearance of the individual churches in terms of their material, ground plan, the division of the walls into sections by means of relief features, portals, windows, tribunes, vaults, and architectural members. I also consider the artistic influences that had an impact on the shaping of the churches. The second part of the thesis consists of a catalogue of the individual churches. For each church I provide a detailed description and a reconstruction of its original appearance. I also attempt to describe the circumstances surrounding the construction of the church. A series of illustrations is attached to the thesis as an appendix.
8

Catalog of Swarm Earthquakes in Vogtland /West Bohemia in 2008/09

Hiemer, Stefan, Rößler, Dirk, Scherbaum, Frank January 2010 (has links)
The document contains the catalog of earthquakes in Vogtland /West Bohemia within the period of 2008/10/19 -to- 2009/03/16. The events were recorded by a seismic mini-array operated by the Institute of Earthsciences, University of Postdam. / Das Dokument enthält einen Katalog von Erdbeben im Vogtland/Westböhmen im Zeitraum 2008/10/19 -bis- 2009/03/16. Die Erdbeben wurden mit Hilfe eines seismologischen Miniarrays, welches vom Institut für Geowissenschaften, Universität Potsdam, aufgestellt wurde, registriert.
9

Catalog of Swarm Earthquakes in Vogtland /West Bohemia in 2008/09

Hiemer, Stefan, Rößler, Dirk, Scherbaum, Frank January 2010 (has links)
The document contains the catalog of earthquakes in Vogtland /West Bohemia within the period of 2008/10/19 -to- 2009/03/16. The events were recorded by a seismic mini-array operated by the Institute of Earthsciences, University of Postdam. / Das Dokument enthält einen Katalog von Erdbeben im Vogtland/Westböhmen im Zeitraum 2008/10/19 -bis- 2009/03/16. Die Erdbeben wurden mit Hilfe eines seismologischen Miniarrays, welches vom Institut für Geowissenschaften, Universität Potsdam, aufgestellt wurde, registriert.
10

Metodika zpracování makroseismických dat a její aplikace na západočeský seismický roj 2008 / Methods of processing macroseismic data and their application to the 2008 earthquake swarm in western Bohemia

Procházková, Pavla January 2011 (has links)
Title: Methods of processing macroseismic data and their application to the 2008 earthquake swarm in western Bohemia Author: Bc. Pavla Procházková Department: Department of Geophysics Supervisor: doc. RNDr. Oldřich Novotný, CSc. Consultant: RNDr. Pavla Hrubcová, PhD. Supervisor's e-mail address: on@karel.troja.mff.cuni.cz Abstract: Abstract: This work evaluates macroseismic observations of the earthquake swarm which occurred in West Bohemia in 2008. The first chapters are devoted to the explanation of basic terms, the geological description of the region and the history of earthquakes in the region. The historical development of macroseismic scales and a detailed description of the EMS-98, used for the evaluation of the 2008 earthquake swarm data, are contained in the following chapters. The main part of the present work deals with the manual macroseismic evaluation of the swarm followed by a description of the program for the automatic evaluation of data. The program results were found to agree with the manual evaluation. In the next part there is a detailed description of a program for drawing isoseismal lines. In the appendix the reader can find an overview of macroseismic scales, sample questionnaires and suggestions to improve the Czech questionnaire. Keywords: macroseismical intensity, EMS-98...

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