A5048374978- Geophysical and Geoelectrical Methods
- Geophysical Methods and Applications
- Seismic Waves and Analysis
- Geomagnetism and Paleomagnetism Studies
- Historical Geopolitical and Social Dynamics
- Hungarian Social, Economic and Educational Studies
- Geological Formations and Processes Exploration
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Marine and environmental studies
- Plant and Biological Electrophysiology Studies
- Magnetic Field Sensors Techniques
- Climate variability and models
- Eastern European Communism and Reforms
- Central European national history
- Planetary Science and Exploration
- Non-Destructive Testing Techniques
- Atmospheric and Environmental Gas Dynamics
- Astro and Planetary Science
- Polish Historical and Cultural Studies
- Electromagnetic Simulation and Numerical Methods
- European Politics and Security
- Geochemistry and Geologic Mapping
- Magnetic and Electromagnetic Effects
- Electromagnetic Scattering and Analysis
HUN-REN Institute of Earth Physics and Space Science
2010-2024
Hungarian Academy of Sciences
2007-2021
Research Network (United States)
2021
Research Centre for Astronomy and Earth Sciences
2018-2020
University of Sopron
2000-2018
J. Selye University
2014
Institute of Magnetism
2011
Abstract In order to evaluate how much Total Solar Irradiance (TSI) has influenced Northern Hemisphere surface air temperature trends, it is important have reliable estimates of both quantities. Sixteen different the changes in TSI since at least 19 th century were compiled from literature. Half these are “low variability” and half “high variability”. Meanwhile, five largely-independent methods for estimating trends evaluated using: 1) only rural weather stations; 2) all available stations...
Depth of investigation and vertical resolution values are determined tabulated for 30 surface geoelectric arrays that have non-zero response, i.e., a depth characteristic (DIC) function due to buried thin horizontal sheet. In accord with experience, results show general reciprocal relationship between resolution. The most frequently used in multi-electrode studies (i.e., Wenner-[Formula: see text], Schlumberger, dipole-axial the pole-dipole array) offer reasonable compromises can be...
ABSTRACT We collected approximately one hundred independent geoelectric arrays from published geophysical literature. have presented them in a systematic way and with unified notation. The classification of is based on three divalent parameters: “superposition” measurements, “focusing” currents “colinearity” the array, creating 8 classes arrays. Among 102 we found literature, managed to classify 92 aforementioned way. Ten further techniques fell beyond proposed classification. propose may...
A statistical analysis was applied to Northern Hemisphere land surface temperatures (1850–2018) try identify the main drivers of observed warming since mid-19th century. Two different temperature estimates were considered—a rural and urban blend (that matches almost exactly with most current estimates) a rural-only estimate. The indicates long-term 0.89 °C/century 1850, while 0.55 °C/century. This contradicts common assumption that thermometer-based global indices are relatively unaffected...
We present a workflow for the improved interpretation of Nile River’s unique dataset implying quantitative water level data from A.D. 622 to 1921 with some breaks. In framework proposed methodology, innovative algorithms are presented (1) filling in missing data, (2) extraction spectral information content completed dataset, and (3) applying statistical pattern recognition using same imputed dataset. first step an inversion-based Fourier transformation method is developed replace reliable...
Abstract Since 2007, the Intergovernmental Panel on Climate Change (IPCC) has heavily relied comparison between global climate model hindcasts and surface temperature (ST) estimates for concluding that post-1950s warming is mostly human-caused. In Connolly et al., we cautioned this approach to detection attribution of change was highly dependent choice Total Solar Irradiance (TSI) ST data sets. We compiled 16 TSI five sets found by altering or ST, one could (prematurely) conclude anything...
For models having moderate departures from the basic distortion model (from so called "principal superim-position" model, that is where local three-dimensional and regional two-dimensional structures are superimposed) a special tensor decomposition method (the phase deviation method) was suggested by Bahr (1991). As far as we know, this technique has never got wide field application in field. In careful examination of solution, an error observed original derivation formulas. paper Bahr's...
The term “null array” is introduced for those electrode configurations where the measured potential difference zero above a homogeneous half‐space when using measuring dipole M 0 N . Different types of null arrays (three‐electrode, Schlumberger, and axial/equatorial arrays) their corresponding traditional are studied. It was shown in field study carried out karstified limestone area covered by thin sediments that it possible to obtain geologically meaningful results with null‐array...
It is known that second‐order magnetic phase transition, the transition between ferromagnetic (ferrimagnetic) and paramagnetic states of material at Curie temperature, accompanied by a sharp (theoretically infinite) enhancement susceptibility. A within Earth (usually mid‐crustal depths, depending on geothermal conditions type material) assumed to produce extremely high susceptibility zones thickness few hundreds meters. Such strongly magnetized may be sources well‐known but not‐yet explained...
ABSTRACT A combined application of two independent direct current geoelectric methods, potential gradient mapping (PM) and magnetometric resistivity (MMR), is proposed for the investigation high‐resistivity basement structures. From a one‐dimensional relation between horizontal electric magnetic fields (due to currents originating from point electrodes placed on surface two‐layered half‐space having basement) several advantages PM‐MMR method are shown two‐dimensional three‐dimensional...
Complex electromagnetic measurements along a profile crossing different great tectonic units in East-Central Europe (East European Platform, Paleozoic and Carpatho-Pannonian region) were carried out by Hungarian, Polish, Slovak Ukrainian institutes. Beside recent MT sounding curves, geomagnetic induction vectors, polar diagrams, apparent resistivity phase pseudosections, short description of earlier magnetotelluric (MT) magnetovariational (MV) experiments is also given. For interpretation...
A simple analytical solution is presented for computing direct current (DC) electric field distortion due to a small cube in homogeneous half‐space, measured with dipole–dipole array on the surface. Both transmitter and receiver may have any orientation; furthermore their position horizontal surface depth of can be freely selected. It shown that approximate method replace more complicated 3D numerical modelling algorithms. The approximation lies linearization problem: secondary source (i.e....
ABSTRACT At an archaeological site (Pilisszentkereszt Cistercian Monastery, Hungary) we carried out 3D tensorial geoelectric mapping measurements. We applied the well‐known form of Ohm’s differential law, where a 2 × resistivity tensor relates to horizontal current density vector and corresponding electric field vector. In DC apparent there are three independent rotational invariants, defined two alternative sets. field, electrode distance was fixed 15 m; perpendicular AB directions were...
Detailed magnetotelluric soundings along the Hungarian section of CEL-7 seismic profile (SW Hungary, where a series very deep 3D sedimentary basins is known from various geophysical-geological investigations) enabled us to produce magnetotellurics-based estimations for topography high-resistivity basement. Both TM and TE modes were used 1D inversion, resulting depth values compared depths, taken “Pre-Tertiary Basement Contour Map Carpathian Basin” by Kilenyi Sefara (1989), called as K-S depths.
ABSTRACT A part of the Békés Basin (an extensional sub‐basin Pannonian Basin, where basement under thick sediments is well known from deep boreholes and seismic measurements, many magnetotelluric (MT) soundings have been carried out for frequencies ranging 1 to 10 −3 Hz) was selected as a test area assess imaging performances various apparent‐resistivity definitions computed with rotational invariants either real complex impedance tensor, or its imaginary part, both. comparison (based on...
For the hydrogeological characterization of fissured rocks it is very important to know fissure directions. To determine dominating directions geophysically, so-called azimuthal geoelectric measurement had seemed be a realistic way, until its shortages (false in many cases) were revealed. In this paper, we improve measurement, on basis analogue modelling, by using Wenner array, which generally applied measurements. We study how measurements are needed carried out (each different measuring...