Martin Bednarik

Martin Bednarik
Earth Science Institute, Slovak Academy of Sciences · Gravimetry and Geodynamics

PhD

About

15
Publications
1,832
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44
Citations

Publications

Publications (15)
Article
Tidal strain time series recorded at the Vyhne Tidal Station are used to test thirteen different ocean tide loading models. Ten models have been calculated using SPOTL: EOT11a, HAMTIDE11a, OSU.TPXO72atlas, OSU.TPXO72, TPX070, DTU10, CSR4.0, FES2004, FES95.2.1, SCHW1 and three other models were chosen from the Free Ocean Tide Loading Provider (FOTLP...
Article
Two extensometer stations have been set up at the margin of the Pannonian Basin to monitor tectonic movements as well as Earth tides and related phenomena. Because the Sopronbánfalva Geodynamic Observatory (SGO) in Hungary and the Vyhne Tidal Station (VTS) in Slovakia are located in different geological, topographic, and tectonic environments, the...
Article
Full-text available
An important, yet until now neglected, aspect of the viscoelastic behaviour of lavas is the Kramers–Kronig consistency of their complex viscoelastic shear modulus. The most general linear viscoelastic model – the generalized Maxwell body with continuous relaxation time spectrum – produces a consistent storage and loss modulus, as can be verified by...
Article
Full-text available
Earthquakes hit urban centres in Europe infrequently, but occasionally with disastrous effects. Obtaining an unbiased view of seismic hazard (and risk) is therefore very important. In principle, the best way to test probabilistic seismic hazard assessments (PSHAs) is to compare them with observations that are entirely independent of the procedure u...
Article
Full-text available
A specially shaped (candlestick shape, high, slim and more or less cylindrical), intact and vulnerable stalagmite (IVSTM) in the Plavecká priepast' cave has been examined. This IVSTM is suitable for estimating the upper limit for horizontal peak ground acceleration (HPGA) generated by prehistoric and paleoearthquakes. These long-term information ab...
Article
Full-text available
The surface deformation of the Tatra Mountains region in Western Carpathians can nowadays be studied directly thanks to precise geodetic measurements using the GNSS. The strain or stress tensor field is, however, a rather complex “data structure” difficult to present legibly and with sufficient resolution in the form of a classical map. A novel and...
Article
Full-text available
The Vyhne Tidal Station of the Earth Science Institute of the Slovak Academy of Sciences is located in the former mining gallery of St. Anthony of Padua in the Vyhne valley, Štiavnick´e vrchy Mts., Central Slovakia. It is equipped with a 20.5 metre long quartz-tube extensometer measuring Earth’s tides, and long-term tectonic deformations of the Ear...
Article
Three-dimensional colour functions were designed for visually agreeable and computationally efficient stress state visualisation in failure analysis. The colours they generate depend on three aspects of the stress state: the distance to failure, the stress character (compressive or tensile), and the relative magnitude of the intermediate principal...
Thesis
Full-text available
The study provides a guided tour through all the stages of construction of a linear, anisotropic, viscoelastic model of a calcite tubular stalactite (soda straw) with the aim to study its seismometric properties in the frequency domain, assuming harmonic seismic excitation of the cave ceiling. The selective review of the present state of the quanti...
Article
Full-text available
The calcite crystals of the wall of tubular stalactites (soda straws) grow, typically, with their c-axis parallel to the axis of the stalactite. With the direction of the c-axis given, the question is whether the rotation angle with respect to the c-axis is somehow determined, too. Although monocrystalline soda straws have been reported, we will he...
Article
The paper exposes the role of the out-of-plane principal stress in the investigations of (brittle) failure of isotropic linear elastic continuum using plane strain (or plane stress) approximations. The plots in (σ m, τ m), (σ 3, σ 1) spaces for each of the examined criteria: the two-dimensional: Coulomb, Tresca, Hoek-Brown, and the three-dimensiona...
Article
Full-text available
Surfaces of many structures in the scope of earth sciences contain sharp edges and corners where mechanical stress concentrates, and where not only the real material but also the mathematical methods of displacement or stress field investigation are most likely to fail, or, as for the latter, to have at least some difficulties. How do the methods o...
Article
The quartz tube extensometer and associated electronics at the Vyhne tidal station operate in very unfriendly conditions of 100% humidity, which causes corrosion of metal parts (suspensions, wirings etc.), often leading to disturbances or complete dropouts of measurements. Response of the instrument to the regular calibration pulses serves not only...
Article
Investigation of the Earth's crust deformation is of great interest for studying recent global and geodynamical processes. For this reason a quartz tube extensometer was installed at the tidal station of the Geophysical Institute of the Slovak Academy of Sciences in Vyhne. High precision 10-9 - 10-11 extensometric (strain) data have been used recen...
Article
New developments in electronic and computer techniques especially, in the field of low power consumption, high memory and computation capacity and of drivers input-output capabilities offer the possibility to build fully automatic instruments for the observations of the horizontal and vertical motions of the Earth's surface. Therefore the number an...

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