Papers by Katalin Gribovszki
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Acta Geodaetica et Geophysica Hungarica, 2001
ABSTRACT
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AIP Conference Proceedings, 2008
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NATO Science for Peace and Security Series C: Environmental Security, 2009
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Acta Geodaetica Et Geophysica Hungarica, 2010
... Tóth L, Gy˝ori E, Mónus P, Zsıros T 2006: In: The Adria Microplate: GPS Geodesy, Tectonics, a... more ... Tóth L, Gy˝ori E, Mónus P, Zsıros T 2006: In: The Adria Microplate: GPS Geodesy, Tectonics, and Hazards. ... Final Report, MTA GGKI Szeizmológiai F˝oosztály Archıvuma, GGRI Seismological Department of HAS Varga P, Gribovszki K, Gy˝ori E, Bus Z 2009: Deterministic seismic ...
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ABSTRACT The examination of special shaped, vulnerable, intact stalagmites in Domica cave (Slovak... more ABSTRACT The examination of special shaped, vulnerable, intact stalagmites in Domica cave (Slovakia) is the continuation of our previous examination of speleothems in Baradla cave (north eastern Hungary). (The Domica and Baradla caves really are two different parts of the same cave system.) The aim of our investigation is to estimate the upper limit for horizontal peak ground acceleration generated by paleoearthquake. There are many vulnerable, special shaped (high, slim and more or less cylindriform) stalagmites in Domica cave. The most vulnerable of these stalagmites have 5 m height and 6 or less than 6 cm diameter at the profile of cylinder, which we have found in Devil's Hall of Domica cave.. The method of our investigation is the same as before: the density, the Young's modulus and the tensile failure stress of the samples originating from broken stalagmites (lying on the ground of Domica cave) have been measured in mechanical laboratory, whereas the natural frequency of intact stalagmite was determined by in situ observation. The value of horizontal ground acceleration resulting in failure and the natural frequency of stalagmite were assessed by theoretical calculations. Our results show, that the tensile failure stress of the samples originating from Devil's Hall of Domica cave higher, than the tensile failure stress of the samples originating from Olimposz Hall of Baradla cave, however the value of Young-modulus is lower. The age of the samples taken from a stalagmite standing in Domica cave have been determined by inductively coupled plasma mass spectrometry analysis (MC-ICPMS). Our measurements show that this stalagmite is still growing and the oldest and bottommost part of it is not older than 117 000 years. The age of the oldest part of stalagmite in Domica nearly the same (130 000 years) as the 5.1 m high stalagmite situated in Olimposz Hall of Baradla cave. The ag value (upper limit for horizontal peak ground acceleration) coming from theoretical calculation is almost the same (0.06g) as it is in the case of stalagmite in Olimposz Hall. On the grounds of our measurements and theoretical calculations, we can state that the geological structures close to Baradla and Domica caves did not excite such paleoearthquakes in the last thousand years, which would have produced horizontal ground acceleration larger than 0.06g This value can arise even in case of moderate sized earthquakes. The natural frequency of this stalagmite --situated in Devil's Hall-- is low, about 1 Hz. Since this low value is in the frequency range of nearby earthquakes, therefore resonance effect can occur. Because of the resonance the failure acceleration can be even smaller.
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Acta Geodaetica Et Geophysica Hungarica, 2004
... north-eastern part of the Pannonian depression and the active fault system of the crystalline... more ... north-eastern part of the Pannonian depression and the active fault system of the crystalline basement (modified version of Cornea's and Sp ... Katalin Gribovszki expresses her gratitude to the staff of Department of Earth Sciences, University of Trieste for the help and guidance ...
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Tectonophysics, 2013
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Journal of Applied Geodesy, 2000
ABSTRACT In September 2007 a geodetic network based on GPS measurements, precise levelling and co... more ABSTRACT In September 2007 a geodetic network based on GPS measurements, precise levelling and continuous borehole tilt measurements was established for surface displacement monitoring on the high bank of the River Danube at Dunaszekcső where a serious landslide began to develop at that time. The landslide took place on February 12, 2008. After rapid, enormous movements, which resulted in significant subsidence (8-10 m) and lateral displacements (4-5 m) on the high bank at Dunaszekcső and the emergence of a peninsula consisting of clastic material in the Danube's bed, the deformation rates significantly dropped. This observation was explained by the secondary metastable equilibrium of the moving blocks at that time. However, our subsequent geodetic data clearly showed that slow post-event movements (mainly subsidence, 0.5-1.0 cm/month) on both the northern and southern sliding blocks have been occurring for the last two years, which means that the sliding blocks did not reach an equilibrium in the mentioned period. At the same time, measurements on our extended geodetic network in the second half of 2010 referred to a possible southward spread of sliding (southern part of the Vár Hill) in the near future. Later on (spring 2011), field observations were also indicative of the initiation of movements on the southern part of the Vár Hill as predicted by the geodetic measurements. The areal extent of the block becoming unstable closely corresponds with the danger zone assigned by GPS observations.
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Geomorphology, 2014
ABSTRACT Five years of geodetic monitoring data at Dunaszekcső, Hungary, are processed to evaluat... more ABSTRACT Five years of geodetic monitoring data at Dunaszekcső, Hungary, are processed to evaluate recurrent landsliding, which is a characteristic geomorphological process affecting the high banks of the Middle Danube valley in Hungary. The integrated geodetic observations provide accurate three dimensional coordinate time series, and these data are used to calculate the kinematic features of point movements and the rigid body behavior of point blocks. Additional datasets include borehole tiltmeter data and hydrological recordings of the Danube and soil water wells. These data, together with two dimensional final element analyses, are utilized to gain a better understanding of the physical, soil mechanical background and stability features of the high bank. Here we indicate that the main trigger of movements is changing groundwater levels, whose effect is an order of magnitude higher than that of river water level changes. Varying displacement rates of the sliding blocks are interpreted as having been caused by basal pore water pressure changes originating from shear zone volume changes, floods of the River Danube through later seepage and rain infiltration. Both data and modeling point to the complex nature of bank sliding at Dunaszekcső. Some features imply that the movements are rotational, some reveal slumping. By contrast, all available observational and modeling data point to the retrogressive development of the high bank at Dunaszekcső. Regarding mitigation, the detailed analysis of three basic parameters (the direction of displacement vectors, tilting, and the acceleration component of the kinematic function) is suggested because these parameters indicate the zone where the largest lateral displacements can be expected and point to the advent of the rapid landsliding phase that affects high banks along the River Danube.
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Аннотация The project addressed the problem of pre-disaster orientation: hazard prediction, risk ... more Аннотация The project addressed the problem of pre-disaster orientation: hazard prediction, risk assessment, and hazard mapping, in connection with seismic activity and man-induced vibrations. The definition of realistic seismic input has been obtained from ...
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Acta Geodaetica et Geophysica Hungarica, 2004
ABSTRACT
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Acta Geodaetica et Geophysica Hungarica, 2008
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Acta Geodaetica et Geophysica Hungarica, 2005
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Acta Geodaetica et Geophysica Hungarica, 2006
ABSTRACT The mechanism of earthquake occurrence in the Pannonian Basin is not clear in most cases... more ABSTRACT The mechanism of earthquake occurrence in the Pannonian Basin is not clear in most cases (in other words, it is often not possible to find a relationship between the location of epicenters and the elements of the maps of recent tectonic movements), hence a GIS has been created in order to clarify the origin of these events. The special seismological GIS includes all relevant information (maps and joint database) concerned with earthquakes covering the whole territory of Hungary. GIS contains the following maps: special macro- and microseismic epicenters and their parameters; different active tectonic fault maps; digital terrain model of the recent relief; digital terrain models of different geological basements; appropriate geophysical anomaly maps; Quaternary sediment thickness; recent rivers, water streams and settlements. GIS enables us to carry out special operations between different layers by applying its tools in order to reveal the recent tectonic movements and to throw light upon the generation of possible earthquake occurrences. Results of the present investigation in GIS revealed that significant relation exists between the earthquake foci and recent tectonic lines. Some foci, however, can not be related to fracture lines. One part of earthquakes showed agreement with Pre-Tertiary basement areas of considerable slope, with the recent tectonic elements of Geomorphological maps and with the piedmonts of the North Hungarian Range. Some traces of recent movements have been found with the help of the multiplication map of Quaternary sediment thickness map and Recent relief (Digital Elevation Model).
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Acta Geodaetica et Geophysica Hungarica, 2004
ABSTRACT
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Papers by Katalin Gribovszki