National Repository of Grey Literature 21 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Geomorphological evidence of neotectonic activity along Cordillera Blanca fault zone, Peru
Masák, Ondřej ; Vilímek, Vít (advisor) ; Stemberk, Josef (referee)
Southwest base of Cordillera Blanca mts. in South American Ands belongs to the most tectonically active fault zones. The core of this thesis was making of a detailed geomorphological map based on remote sensing satellite images for the purpose of analysis of direct and indirect manifestations of neotectonics. The greatest emphasis was placed on morphological manifestations of tectonics movements which are fault scarps facets and vertical fault steps deforming other shapes of relief - e.g. lateral moraines, dejection cones. Vertical steps reach from a few meters to tens of meters (max. 60 m) according to the age of influenced landform. Evaluation of measurements from deformometr from locality Pitec shows main trends of movements - moderate rise of massif, slow opening of fault plane and negligible left-lateral slip. Calculation of mountain-front sinuosity index, whose values were found relatively low, confirms high tectonic activity of fault zone. Analysis of longitudinal stream profiles hasn't showed presence of knick-points in the place of crossing with fault zone. Non-continuous process of lifting movements, whose interval is estimated at 1ka to 3ka (while the very last 2ka has been in relative tectonic calm), could be a possible explanation. Deep erosion of water streams wiped the tectonics...
Field measurement of natural electromagnetic emissions near the active tectonic and mass-movement fractures in caves
Trčka, T. ; Macků, R. ; Koktavý, P. ; Škarvada, P. ; Baroň, I. ; Stemberk, Josef
Laboratory tests on a wide range of solid materials shoved that the electromagnetic emission (EME) signals are generated during the samples mechanical stress. EME anomalies have been observed also under natural conditions in association to fracture processes, tectonic loading, stress redistribution and crack propagation prior to earthquake or in relation to deep-seated gravitational mass movements. This paper describes a first prototype of the Emission data logger, which was specially developed for the continual EME monitoring in field conditions. Our equipment has been installed and tested in Obir Caves (Austria) at an active tectonic fault. The pilot long-term EME measurement results from this location are also presented in this paper.
Study of present-day geodynamic processes in the area of Hronov-Poříčí Fault Zone
Stejskal, Vladimír ; Vilímek, Vít (advisor) ; Stemberk, Josef (referee) ; Kirchner, Karel (referee)
The presented PhD thesis deals with present-day geodynamic processes in the south- western part of Broumov Highland, with a special attention paid to the seismoactive Hronov- Poříčí Fault Zone (HPFZ). Compared to the rest of the Bohemian Massif the studied area exhibits relatively increased level of tectonic activity, which is evidenced by local seismicity and by presence of CO2-rich mineral waters. The present-day activity of geodynamic processes is studied by means of various geomorphological, geotechnical, geophysical and hydrological methods. Following processes and features were studied: activity of slope movements, seismic activity, present-day tectonic movements, relations between landforms and joint and fault tectonics. Based on the previous experience obtained by the author in the seismoactive area of Western Bohemia, groundwater observational network was set up in deep boreholes, in order to detect anomalies related to the tectonic activity of the studied area. The thesis represents a contribution to the deeper understanding of the studied area and also a contribution in respect of possible applications of some new methods that can be used in research of zones with relatively increased tectonic activity inside of stable areas of Central Europe. From geomorphological point of view, the...
Geomorphological evidence of neotectonic activity along Cordillera Blanca fault zone, Peru
Masák, Ondřej ; Vilímek, Vít (advisor) ; Stemberk, Josef (referee)
Southwest base of Cordillera Blanca mts. in South American Ands belongs to the most tectonically active fault zones. The core of this thesis was making of a detailed geomorphological map based on remote sensing satellite images for the purpose of analysis of direct and indirect manifestations of neotectonics. The greatest emphasis was placed on morphological manifestations of tectonics movements which are fault scarps facets and vertical fault steps deforming other shapes of relief - e.g. lateral moraines, dejection cones. Vertical steps reach from a few meters to tens of meters (max. 60 m) according to the age of influenced landform. Evaluation of measurements from deformometr from locality Pitec shows main trends of movements - moderate rise of massif, slow opening of fault plane and negligible left-lateral slip. Calculation of mountain-front sinuosity index, whose values were found relatively low, confirms high tectonic activity of fault zone. Analysis of longitudinal stream profiles hasn't showed presence of knick-points in the place of crossing with fault zone. Non-continuous process of lifting movements, whose interval is estimated at 1ka to 3ka (while the very last 2ka has been in relative tectonic calm), could be a possible explanation. Deep erosion of water streams wiped the tectonics...
Geodynamical hazards of the Malé Karpaty Mts. northern part
Briestenský, Miloš ; Stemberk, Josef (advisor) ; Ondrášik, Rudolf (referee) ; Krejčí, Oldřich (referee)
Abstact In the scope of my Ph.D. thesis, the epicentral Dobrá Voda erea was selected for study of geodynamical hazards connected with active faults crossing the area. There was chosen some geomorphological, geological as well as geotechnical methods to discover recent tectonic regime. The obtained results showed close relationship between fault striking and drainage system orientation as well as erosion furrows orientation. Furthermore, wide-ranging slope deformations are located ďong faults with proved activity and the both phenomenons were studied and registered. Moreover, striking faults are reflexing by tufas, sag ponds and swallow holes occurence on the surfaoe. The subsurface active fault display is documented by' sinter damages along the fault in the local Zbojrucka and Slopl Caves. This manifestation influenced these caves to studS' fault microdiplacements and the net was extented by two extensometric TMTI gauges situated on the surface localities too. The monitoring results showed significant tenths and hundredths of mm movement trends per year as well as strain regime ohanges dwing local singnificant earthquakes. On the other hand, sence of the fault displacements showed sinistral block rotation in the wide-rangilg sinistral Mur-Mtirz-Leitha fault zone, which can be changed into dextral block...

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6 Stemberk, Jakub
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