Josef Stemberk

Josef Stemberk
Institute of Rock Structure and Mechanics of the Czech Academy of Sciences

PhD

About

86
Publications
16,594
Reads
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1,194
Citations
Additional affiliations
February 2004 - present
Charles University in Prague
Position
  • Lecturer
Description
  • Semestral lectures from Dynamic Engineering Geology for Bachelor and Master´s students

Publications

Publications (86)
Article
Full-text available
The Superstition Hills Fault (SHF) exhibits a rich spectrum of slip modes, including M 6+ earthquakes, afterslip, quasi‐steady creep, and both triggered and spontaneous slow slip events (SSEs). Following 13 years of quiescence, creepmeters recorded 25 mm of slip during 16–19 May 2023. Additional sub‐events brought the total slip to 41 mm. The event...
Preprint
Full-text available
The Superstition Hills Fault (SHF) exhibits a rich spectrum of slip modes, including M 6+ earthquakes, afterslip, quasi-steady creep, and both triggered and spontaneous slow slip events (SSEs). Following 13 years of quiescence, creepmeters recorded 25 mm of slip during 16-19 May 2023. Additional sub-events brought the total slip to 41 mm. The event...
Article
Full-text available
Stress variations in the Earth's crust need to be understood in both the spatial and temporal domains to address a number of pressing societal issues. In this paper, precise three dimensional records of fault kinematic behaviour obtained by mechanical extensometers are used to investigate changes in stress states along major faults in the Eastern A...
Article
Full-text available
Ultralow frequency (ULF) to low frequency (LF) electromagnetic radiation represents one of the most promising effects of brittle rock strain and microcracking that might be potentially helpful for short term earthquake forecasting. In this study the results of a six month monitoring campaign are presented from Obir Cave in the eastern Alps. Direct...
Article
Full-text available
A series of reclamation works that took place during the twentieth century, almost completely destroyed the dune system that characterized the eastern part of the Grado-Marano perilagoonal area (NE Italy). Because of the limited data available, so far very little was known about the local subsurface conditions and the present paper presents the mai...
Article
Full-text available
We report the results of 3-years of Radon-222 monitoring in six show caves across Europe, selected with the feature of having only one, or no natural entrance, defined as dead-end caves. The caves are located in Spain, Slovakia, Slovenia, and Czechia. The consecutive monitoring was performed between January 2017 and January 2020. Continuous measure...
Article
Full-text available
In situ micro-displacement monitoring in caves at the seismically active junction of the Southern Alps, Dinarides and Southwestern Pannonian Basin revealed active tectonic micro-deformations. The largest total vertical movement of 0.35 mm (2008–2018) occurred at Kostanjeviška Jama (Southwestern Pannonian Basin–Dinarides). Two abrupt displacements o...
Chapter
The Czech World Centre of Excellence (WCoE) on Landslide Risk Reduction 2017–2020 entitled as “Complex geomorphological and engineering geological research of landslides combined with assessment of adverse societal impacts” included research, education and awareness of landslide risks. Originally, the only participants were Charles University and t...
Article
Full-text available
This work presents the results of 3-D movements of faults occurring in the Dědičná štola Gallery in the Rychlebské hory Mts. during the period between 2014 and 2017. The faults were monitored by TM-71 extensometers. The detected fault slip is nonlinear and is affected by short transient periods of acceleration. One dominant and a series of minor tr...
Article
Full-text available
The Neogene to Quaternary lateral extrusion of the Eastern Alps towards the Pannonian Basin is accommodated by a system of strike-slip faults. Despite decades-lasting GPS observations, no information on contemporary kinematic behaviour of these faults has been available. Therefore, we had monitored subsidiary and/or conjugated faults associated to...
Article
A fault slip within the Ñaña tunnel Lima, Peru has been monitored since 2012. The data are recorded using an optical-mechanical 3D extensometer, capable of providing very precise long-term three-dimensional measurements of relative displacement across discontinuities. The Ñaña tunnel has an extremely stable environment and cannot possibly be affect...
Article
Full-text available
We present the results of 3-D monitoring of strain along active faults outcropping in the central Apennines, where recent and historical strong earthquakes occurred, using TM-71 extensometers during the period 2002–2017. We discuss the fault slip development as well as kinematics particularly in the light of local recent seismicity. The recorded fa...
Article
Full-text available
The only early medieval rock bas-relief in Europe Madara Horseman is included in UNESCO World Heritage List. This article presents the results from an in situ monitoring of microdisplacements across fissure forming the Golyamata Tsepnatina Cave located at the edge of Madara Plateau above the Horseman, NE Bulgaria. Additionally, we studied movements...
Article
Full-text available
The fault displacement monitoring network EU-TecNet was established to define microdisplacements across faults in the territory of Central Europe (www.tecnet.cz), using three-dimensional optical-mechanical extensometers. The results of long-term neotectonic activity obtained from two caves localized in eastern part of the Slovenský kras Mts. (SE Sl...
Article
This paper describes a pair of intensively studied deep seated gravitational slope deformations from the Czech Republic. Structural geological mapping and the interrogation of high resolution LiDAR DEMs have been used to reassess the extent of each slope deformation and to obtain new information about their surface morphologies. Electrical resistiv...
Article
Full-text available
Research and dissemination activities of the World Centre of Excellence on Landslide Risk Reduction (WCoE), located in Prague, Czech Republic, entitled “Landslide risk assessment and development guidelines for effective risk reduction” focus on the strengthening of landslide risk reduction efforts defined through the Sendai partnership and the Inte...
Conference Paper
Full-text available
The World Centre of Excellence (WCoE) on Landslide Risk Reduction entitled “Landslide risk assessment and development guidelines for effective risk reduction” (2014–2017) was designed to contribute to the risk reduction effort formulated in the Sendai Partnership initiative. Several research activities were developed and their results were presente...
Article
Full-text available
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 re...
Article
Abstract On the northern coast of the Hornsund fjord at SW Svalbard, numerous rock block accumulations flank the foot of Rotjesfjellet ridge. Whereas these accumulations are widely described as rock glaciers, this study shows that other factors also influence formation of these landforms. In this study, morphometric profiling and terrain analyses,...
Conference Paper
Full-text available
Electromagnetic emissions (EME) occur during the fracturing of solid materials under laboratory conditions and may represent potential earthquake precursors. We recorded EME from May 2015 to October 2015 in two caves situated in contrasting seismotectonic settings. Zbrašov Aragonite Caves are located close to the seismically quiescent contact betwe...
Article
Full-text available
Tectonic elastic strain and ground deformations are documented as the most remarkable environmental phenomena occurring prior to local earthquakes in tectonically active areas. The question arises if such strain would be able to trigger mass movements. We discuss a directly observed fault slip and a subsequent minor activation of a deep-seated grav...
Article
Full-text available
The EU-TecNet monitoring network uses customized three-dimensional extensometers to record transient deformations across individual faults. This paper presents the first results from two newly established monitoring points in the Balkan Mountains in Bulgaria. The data from Saeva Dupka, recorded across an EEN-WWS striking fault, show sinis-tral stri...
Conference Paper
Full-text available
The EU-TecNet monitoring network was established more than ten years ago to record fault displacements across selected tectonic structures in the shallow crust. The network comprises more than one hundred fifty sites, most of which are situated underground, spread across the globe (www.tecnet.cz). Fault displacements are recorded in three dimension...
Conference Paper
Full-text available
Fault displacements have been monitored at a geological test site in Bedřichov Tunnel, near Liberec, in northern Bohemia for more than a decade. The data are generated by four mechanical extensometers: two installed across faults orientated broadly NW-SE and two across faults orientated broadly NE-SW. These instruments measure rotations in two perp...
Article
Full-text available
This paper presents the results of direct 3−D fault displacement monitoring along the northern shore of Hornsund Fjord, SW Spitsbergen, Svalbard. The fault displacements have been recorded using three permanently installed optical−mechanical crack gauges since 2009. The monitoring data from all three sites provided evidence for a remarkable slip ev...
Article
Full-text available
This paper presents the results of direct 3−D fault displacement monitoring along the northern shore of Hornsund Fjord, SW Spitsbergen, Svalbard. The fault displacements have been recorded using three permanently installed optical−mechanical crack gauges since 2009. The monitoring data from all three sites provided evidence for a remarkable slip ev...
Article
Full-text available
Zusammenfassung Rezente Bewegungen im Nördlichen Oberrheingraben werden an der östlichen Grabenrandverwerfung in Darmstadt seit 2007 und an der westlichen Graben-randverwerfung in Deidesheim seit 2009 mittels optomechanischer Messungen kontinuierlich beobachtet. In Darmstadt sind sie mit Jahresraten von durch-schnittlich 0,53 mm Kompression, 0,65 m...
Article
Full-text available
The EU-TecNet fault displacement monitoring network records three-dimensional displacements across specifically selected tectonic structures within the crystalline basement of central Europe. This paper presents a study of recent and active tectonic fault displacement recorded at Zapadni Cave in northern Bohemia (Czech Republic). It extends previou...
Article
Full-text available
The EU-TecNet fault displacement monitoring network records three-dimensional displacements across specifically selected tectonic structures within the crystalline basement of central Europe. This paper presents a study of recent and active tectonics at Západní Cave in northern Bohemia (Czech Republic). It extends previous geological research by me...
Article
Full-text available
Tectonic instability may be measured directly using extensometers installed across active faults or it may be indicated by anomalous natural gas concentrations in the vicinity of active faults. This paper presents the results of fault displacement monitoring at two sites in the Bohemian Massif and Western Carpathians. These data have been supplemen...
Article
Full-text available
The EU-TecNet fault displacement monitoring network records three-dimensional displacements across specifically selected tectonic structures within the crystalline basement of central Europe. This paper presents a study of recent and active tectonics at Západní Cave in northern Bohemia (Czech Republic). It extends previous geological research by me...
Conference Paper
Full-text available
Deformation of the Earth’s lithosphere involves the response of a brittle crust overlying a ductile substrate. It is widely recognised that the nearly ubiquitous presence of discontinuities in the brittle crust ensures that the mechanical behaviour of a rock mass is different to that of most engineering materials. These discontinuities are major co...
Chapter
Full-text available
Rockfalls and rock slides belong among the most dangerous slope processes since even small magnitude events involving single boulders may cause high damage to infrastructure or may lead to serious injuries or even fatalities. In the environment of the Czech Republic or other Middle European countries, this phenomenon is often highly localized, invo...
Article
Full-text available
It is possible to monitor slow-moving landslides and assess landslide stabilisation measures over protracted periods using an optical–mechanical crack gauge called a TM-71. This technical note outlines the theoretical background to the gauge and illustrates its practical application through a number of case studies. These studies are drawn from a r...
Article
Full-text available
This paper reports on a study of active tectonics undertaken in the intracratonic setting of central Europe in the junction zone between Eastern Alps and Western Carpathians. The study site is focused on the karstic system of Driny Cave in the Malé Karpaty Mts, Slovakia. A range of geological, geomorphological, and in situ displacement data are pre...
Article
Full-text available
In recent years, many underground spaces such as caves and deep mines have been used to monitor geodynamic activity in the Western Carpathians and Bohemian Massif. In addition, long-term radon gas monitoring has also being undertaken in three of the caves. The observed radon concentrations have shown diurnal, seasonal and yearly variations. A signi...
Article
Full-text available
At the end of 2010 seven TM 71 extensometers, installed at or near the active faults in Slovenia, were in operation. Three of them are on the surface and four inside karst caves. The highest rates with stable sense of movements were observed on the Idrija fault. Average horizontal displacement rate was 0.24 mm/year. Short term rates were even great...
Article
Full-text available
The paper presents the results of monitoring study undertaken during the period 2008 - 2010. The study recorded the displacement of tectonic structures in the Strašín Cave (SW Bohemian Massif). The derived results were compared, among others, with data recorded over the same time period across the Bohemian Massif in the EUTecNet (tectonic displacem...
Article
Full-text available
In this paper, results from the long-term monitoring of two deep-seated slope deformations are presented. These deformations are considered typical of the types of landslide that occur in the high mountains of the Western Carpathians. The localities are situated in similar geological settings and this has enabled direct comparison of their developm...
Article
Full-text available
Long-term geotechnical monitoring of crack and fissure movements in slope deformations, historical buildings, as well as underground objects in Slovakia, provided results that bear evidence of movement trends, as well as of present tectonic unrest. The results were subject to an analysis regarding anomalies in movements that would verify activity o...
Article
Full-text available
This paper presents the results of a long-term monitoring study undertaken during the period 2002–2007. The study recorded the displacement of various widely-distributed tectonic structures along the generally aseismic Bohemian Massif (Czech Republic) and specifically along the Sudeten Marginal Fault Zone. The derived results were compared with dat...
Article
Full-text available
Micro-tectonic deformations have been monitored continuously in 3D in Postojna Cave, Slovenia with TM 71 extensometers since 2004. Two instruments, 260 m apart, were installed on the Dinaric oriented (NW-SE) fault zone that is situated about 1,000 m north of the inner zone of the regionally important Predjama Fault. Monitoring on both instruments h...
Article
Full-text available
The NW–SE striking Sudetic Marginal Fault (SMF) is one of the most conspicuous tectonic structures in central Europe. It controls the pronounced morphotectonic escarpment of the Sudetic Mountains for a length of 130 km. This paper presents the results of trenching on the SMF, undertaken in order to assess activity of the fault. The trenching techni...
Article
Full-text available
This paper examines the results of fault microdisplacement analyses obtained from sites located both at the surface and underground in western Slovakia. The results of surface monitoring showed significant annual climatic effects on the various displacement components. In contrast, the results of underground monitoring in caves showed minimal clima...
Article
Full-text available
The Sudetic Marginal Fault (SMF) separates the Fore-Sudetic block on the NE and the Sudetic block on the SW of Bohemian Massif. The fault slip data along the SMF yielded two different subhorizontal orientations of the maximum stress axes. The NE–SW oriented compression was computed in the Fore-Sudetic block, while the NNW–SSE compression is recorde...
Article
Full-text available
The tectonic setting of W Slovenia is characterised by NW-SE trending dextral strike-slip fault systems and moderate seismicity. Monitoring of tectonic movements along five presumably active faults or in their vicinity using TM 71 extensometers was set up in 2004. In five years of monitoring some clear trends of displacement were established. The m...
Article
Full-text available
The results obtained by four years long TM 71 extensometcr monitoring of 3D micro-tectonic displacements of Dinaric Fault Zone on two sites, being 260 in apart in Postojna Cave, were statistically evaluated with different methods (Kolmogorov-Smimov test, comparison between relative displacement and earthquakes, linear regression, Kruskal-Wallis one...
Article
Full-text available
Three year monitoring of micro-displacements on four tectonic fracture planes in a tunnel driven by a milling cutter into granitoids of Bohemian Massif revealed micro-movements that develop in certain trends and impulses. Two investigated fractures are of the Krušné Hory Mts. orientation (NE - SW), other two of Sudeten orientation (NW - SE). These...
Article
Full-text available
This paper presents results of morphotectonic research carried out in order to determine the neotectonic development of the drainage network in the NE spur of the Bohemian Massif (central Europe). The area studied comprises the north-eastern sector of the Rychlebské Mts, belonging to the Sudeten Mountains and the adjacent part of the Žulovská Hilly...
Article
Full-text available
Information is given about the micro-displacement monitoring network in the Dobrá Voda epicentral area, where regular monitoring started in May 2004 and an earthquake occurred on 13 March 2006. The measurement is carried out with the use of verified, stable and sensitive 3D crack gauges TM71 produced by GESTRA Sedloňov, Czech Republic. All the gaug...
Article
Full-text available
Information is given about the micro-displacement monitoring network in the Dobrá Voda epicentral area, where regular monitoring started in May 2004 and an earthquake occurred on 13 March 2006. The measurement is carried out with the use of verified, stable and sensitive 3D crack gauges TM71 produced by GESTRA Sedloňov, Czech Republic. All the gaug...
Article
Full-text available
Quaternary faulting in the western part of the Gulf of Corinth has been evidenced by geology and geomorphology, as well as by seismic recording. A series of three main normal fault segments are aligned in a steep southern coastal zone of the gulf. These fault segments, 15 to 25 km long, have an average strike of 90° - 105° and a northward dip of ab...
Article
Full-text available
Monitoring of tectonic movements along three active faults of Dinaric (NW-SE trending) fault system in W Slovenia using TM 71 extensiometers was set up in 2004. After two and a half years of measurements clear trends of displacement were recorded. The average left-lateral displacement along a crack in the inner fault zone of the Idrija fault in Ucj...
Article
Full-text available
Micro-displacement monitoring in Slopy and Zbojnicka caves is described. It started at the end of 2005 with the use of verified, stable and sensitive 3D crack gauges TM71 produced by GESTRA Sedlohov. Two gauges were installed in the caves across significant tectonic structures. Registered displacements are pertinent to the last significant earthqua...
Article
Full-text available
Stability conditions in a wider surrounding of the rock castle Drábské Světničky (Drábské Rooms) near the town of Mnichovo Hradiště were investigated. The area which has been intensively disturbed by large old as well as present slope movements is located in the north-western part of Příhrazy Platform. Solid, thick bedded sandstones, well resistant...
Article
Full-text available
On the Polish side of the Sudeten more than ten TM-71 crack-gauges, constructed by Kostak, have been installed for micro-movement monitoring since the 70'ties of the 20 th Century. The first instruments were installed for monitoring of gravitational movements of rock blocks on Szczeliniec Wielki Massif in the Table Hills Mts. Later the gauges were...
Article
Full-text available
Basic information is given about the installation of monitoring instrumentation in W part of Slovenia where measurements started at the beginning of 2004. The measurement is carried out with the use of a verified, very stable and sensitive deformeter TM71. Four instruments were installed either directly in or in the close vicinity of major Dinaric...