Acta Geodaetica et Geophysica

Items from 1 to 20 out of 876 results

article

Geoelectrical Structure of the Earth’s Mantle in Pannonian Basin

V. Yu. Semenov, A. Ádám, M. Hvozdara, V. Wesztergom

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 151-168

Data from four geomagnetic observatories: Nagycenk, Tihany, Hurbanovo and Wien-Kobenzl together with magnetotelluric data obtained at 4 points situated not far from these observatories were analyzed to estimate the geoelectrical mantle structure in the Pannonian Basin. Response functions were estimated in the period range from seconds to several hours by the MT method and from 3 days to 1 year by...

article

In memoriam Professor Lajos Stegena (1921–1997)

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 253-258

article

A Stable Iterative Scheme for Inversion of Direct Current Resistivity Sounding Data

Sri Niwas, Amit Mehrotra

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 15-25

This paper deals with a scheme for inversion of d.c. resistivity data wherein illconditioning of the system matrix is reduced by making initial guess in terms of reflection coefficients instead of resistivities and ridge regression inversion is performed by composing the system matrix wherein differential weights (ω_r and ω_t are provided to the set of columns pertaining to reflection coefficient and...

article

The Development of the Solar System — Relations to Physics and Cosmology

W. Schröder, H.-J. Treder

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 125-133

The Kantian cosmology “based on Newtonian principles” is founded on celestial mechanics, statistical mechanics and atomistic thermodynamics. However, these fundamental physical laws are working in the given cosmos.

article

Modelling of Solidification Processes in Magma Chambers Cooled from above

Peeyush Tewari, U. S. Gupta, Sri Niwas

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 3-13

Moving Boundary Formulation is used to analyze one dimensional model of magma chamber which gradually cools and solidifies after emplacement in the region. Cooling of a layer of pure melt (magma chamber) from above leads to a temperature profile that increases with depth and is thermally unstable. The vigor of convection thus produced, is determined by Rayleigh-Nusselt number based on the finite depth...

article

Focal Depth Estimation from Intensity Distribution

T. Zsíros

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 73-86

For the scarcity of data, isoseismal maps frequently cannot be drawn based on the intensity distributions of historic earthquakes. Therefore, the traditional focal depth estimations with isoseismals are out of question for such events. The method presented in this paper, instead of isoseismals, uses the discrete intensity distributions of earthquakes. The focal depth is determined from the observed...

article

Role of Solar Wind Wave Events in the Generation of Geomagnetic Pulsations

T. A. Plyasova-Bakounina

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 169-191

In contrast with the popular model of two sources of Pc pulsations, “external” and “internal”, a new concept assuming a common extra-magnetosphere origin is suggested, the idea being that the two distinct types of upstream waves in the solar wind lead to two types of Pc pulsations on the ground. The transverse monochromatic F — B dependent upstream waves are presumed responsible for generation...

article

Book reviews

J. Somogyi, P. Varga, G. Götz, J. Verö

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 259-262

article

The Mid-German Conductivity Anomaly and its Contribution to the Determination of the Variscan Deep Structure

G. Porstendorfer

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 135-150

It is possible to construct a precise isoline map of the scalar magnitude of the induction arrows for Germany in the period range 10 to 20 min based on the results of different study groups. In the central part of Germany, a minimum zone indicates high crustal conductivity to the North of the renewed southward increase of these scalar magnitudes and it corresponds to the location of the Mid-German...

article

Are Pulsations within the Magnetosphere Affected by the Orientation and Magnitude of IMF?

T. A. Plyasova-Bakounina

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 193-202

The paper discusses observational and theoretical characteristics of geomagnetic pulsation having a source in the solar wind (Pc_sw) and in the magnetosphere (Pc_mg), respectively. Possible pathways of propagation ere also shown.

article

Maximilian Hell: An Auroral Study in the 18th Century

J. Verő

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 235-243

In addition to a biography of M Hell and of his companion, J Sajnovics, the background of his youth, the Selmec Academy and its connection with the Jesuit order is shortly characterized. The circumstances and events of the Northern expedition and the best known result, the discovery of the Finnish-Hungarian linguistic relationship by Sajnovics are mentioned, then Hell’s views on auroras before and...

article

A Computer Program to Study the Effect of Transition Layer Parameters on the Schlumberger Apparent Resistivity

M. Banerjee, S. K. Singh, Nagendra P. Singh, T. Lal

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 105-120

A computer program has been developed for the preparation of master curves of Schlumberger apparent resistivity function (g&s/li) versus the various values of half current electrode spacings over a horizontally stratified three-layered earth model having the intermediate interstratum as the transition layer. The interstratum has two types of conductivity variation: one, the linear variation, and...

article

PC Implementation of the Sodes2 Program System and Optimization of the Paks Network

Saad Yazji

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 27-42

This paper informs about the implementation of the software SODES2 program system, which was written in the University of Karlsruhe in Germany, on microcomputers to solve second order design (S.O.D.) problem of two-dimensional networks. This program system relies on the least-squares approximation of the inverse criterion matrix. It was written in Fortran-77 working only on a mainframe computer of...

article

Professor emeritus Ernő Takács 70 years old

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 249-252

article

The Aqaba Eartquake of November 22, 1995 and Co-Seismic Deformation in Sinai Peninsula, Deduced from Repeated GPS Measurements

F. Kimata, A. Tealeb, H. Murakami, N. Furukawa, more

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 53-71

The new techniques of space geodesy, especially the Global Positioning System (GPS), allow the monitoring of ongoing crustal deformation and provide a powerful tool for the analysis of the regional seismotectonic regime and characterization of current strain accumulation and release.

article

The Optimal Design of the Monitoring Network of a Ground Fault in Syria

Saad Yazji

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 87-103

The optimal design is given of the monitoring network of the movements in the fault area beside a river and a dam in Syria. The optimal design is sought depending on the optimality criteria used to solve the second order design (S.O.D.), that means the precision, the reliability and the economy. A model is proposed to control the vertical fault movements according to the geodetic methodology and its...

article

Estimation of Coefficients of the 2D-Projective Transformation with the Cauchy-Function

L. Battha, J. Somogyi

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 245-248

The paper deals with the robust estimation of coefficients of the two dimensional projective transformation using the Cauchy-function and shows a solution.

article

Pioneers of Polar Aurorae in Hungary 1768–1910 and Spectral Research at Observatory Ógyalla by Konkoly-Thege

L. Křivský

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 121-123

The early history of auroral research in Hungary and especially at the observatory Ógyalla-Hurbanovo is reviewed, emphasizing Konkoly-Thege’s spectroscopic research.

article

Electromagnetic Induction Profile (PREPAN95) from the East European Platform (EEP) to the Pannonian Basin

A. Ádám, T. Ernst, J. Jankowski, W. Jozwiak, more

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 203-223

Complex electromagnetic measurements along a profile crossing different great tectonic units in East-Central Europe (East European Platform, Paleozoic Europe and Carpatho-Pannonian region) were carried out by Hungarian, Polish, Slovak and Ukrainian institutes. Beside recent MT sounding curves, geomagnetic induction vectors, polar diagrams, apparent resistivity and phase pseudosections, a short description...

article

Recent Crustal Movements and Seismicity Studies Around Active Faults, Aswan, Egypt

Abd El Monem S. Mohamed

Acta Geodaetica et Geophysica > 1997 > 32 > 1-2 > 43-52

Monitoring of recent crustal movements was carried out in Egypt for the first time in the Aswan region after the occurrence of the November 14,1981 earthquake with a magnitude of 5.5 in the Kalabsha area 60 km southwest from the Aswan High Dam. This earthquake was considered a very important event as it was located not far from the Aswan High Dam. Due to its possible association with the impoundment...

Publication date

Set your own date range

Year

2019 (35)
2018 (41)
2017 (38)
2016 (51)
2015 (34)
2014 (38)
2013 (35)
2012 (38)
2011 (33)
2010 (48)
2009 (42)
2008 (41)
2007 (30)
2006 (38)
2005 (36)
2004 (39)
2003 (36)
2002 (26)
2001 (35)
2000 (46)
1999 (38)
1998 (35)
1997 (43)
more

Keywords

GPS (44)
SEISMIC HAZARD (29)
EARTHQUAKE (28)
TEC (22)
IONOSPHERE (20)
SEISMICITY (19)
PANNONIAN BASIN (18)
MAGNETOTELLURICS (16)
TOTAL ELECTRON CONTENT (15)
GEOID (13)
NOCTILUCENT CLOUDS (13)
EARTHQUAKES (11)
INVERSION (11)
DEFORMATION (10)
GEOPHYSICS (10)
MAGNITUDE (10)
FOCAL DEPTH (9)
AURORA (8)
GEODYNAMICS (8)
GEOMAGNETIC ACTIVITY (8)
GEOREFERENCING (8)
GEODESY (7)
GNSS (7)
GOCE (7)
HISTORICAL MAPS (7)
IONOSONDE (7)
ROBUST ESTIMATION (7)
TECTONICS (7)
ACCURACY (6)
ASYMPTOTIC SCATTER (6)
EARTH ROTATION (6)
EGYPT (6)
GLONASS (6)
GRACE (6)
INTENSITY (6)
NNSS (6)
NUMERICAL SIMULATION (6)
ACCELERATION (5)
ATMOSPHERIC ELECTRICITY (5)
CARPATHIAN BASIN (5)
FOCAL MECHANISM (5)
GENETIC ALGORITHM (5)
HUNGARY (5)
MAGNETOTELLURIC SOUNDING (5)
MANTLE CONVECTION (5)
POLAR MOTION (5)
RELIABILITY (5)
SEMI-INTERSEXTILE RANGE (5)
SOLAR ACTIVITY (5)
SOLAR WIND (5)
SOURCE DIMENSIONS (5)
TRAVELLING IONOSPHERIC DISTURBANCES (5)
VRANCEA EARTHQUAKES (5)
ATMOSPHERIC ELECTRIC POTENTIAL GRADIENT (4)
ATTENUATION (4)
AURORAS (4)
CHAMP (4)
CRUSTAL DEFORMATION (4)
DEFORMATION MONITORING (4)
EARTH TIDES (4)
EARTHQUAKE HAZARD (4)
EARTH’S ROTATION (4)
EDGE DETECTION (4)
GEODETIC NETWORKS (4)
GEOMAGNETISM (4)
LANDSLIDE (4)
LEAST SQUARES (4)
LIQUEFACTION (4)
LITHOSPHERE (4)
MANTLE PLUMES (4)
MAP PROJECTIONS (4)
MESOPAUSE (4)
NOISE (4)
OLD MAPS (4)
OUTLIER (4)
PRECISION (4)
REGULARIZATION (4)
RETURN PERIOD (4)
RHEOLOGY (4)
SAMPLE MEDIAN (4)
SEISMIC RISK (4)
SPACE WEATHER (4)
SPECTRAL ANALYSIS (4)
ASTHENOSPHERE (3)
COMBINATION (3)
CONDUCTIVITY ANOMALY (3)
CRUST (3)
DEFLECTION OF THE VERTICAL (3)
DETERMINISTIC SEISMIC HAZARD COMPUTATION (3)
EARTH TIDE (3)
EARTHQUAKE FORECASTING (3)
EARTHQUAKE MECHANISM (3)
ENGINEERING GEODESY (3)
ERRORS-IN-VARIABLES MODEL (3)
FAULTS (3)
GEODETIC NETWORK (3)
GEOMAGNETIC PULSATIONS (3)
GEOMAGNETIC STORMS (3)
GEOPOTENTIAL MODEL (3)
GLOBAL OPTIMIZATION (3)
more

INFONA - science communication portal

Acta Geodaetica et Geophysica

Geoelectrical Structure of the Earth’s Mantle in Pannonian Basin

In memoriam Professor Lajos Stegena (1921–1997)

A Stable Iterative Scheme for Inversion of Direct Current Resistivity Sounding Data

The Development of the Solar System — Relations to Physics and Cosmology

Modelling of Solidification Processes in Magma Chambers Cooled from above

Focal Depth Estimation from Intensity Distribution

Role of Solar Wind Wave Events in the Generation of Geomagnetic Pulsations

Book reviews

The Mid-German Conductivity Anomaly and its Contribution to the Determination of the Variscan Deep Structure

Are Pulsations within the Magnetosphere Affected by the Orientation and Magnitude of IMF?

Maximilian Hell: An Auroral Study in the 18th Century

A Computer Program to Study the Effect of Transition Layer Parameters on the Schlumberger Apparent Resistivity

PC Implementation of the Sodes2 Program System and Optimization of the Paks Network

Professor emeritus Ernő Takács 70 years old

The Aqaba Eartquake of November 22, 1995 and Co-Seismic Deformation in Sinai Peninsula, Deduced from Repeated GPS Measurements

The Optimal Design of the Monitoring Network of a Ground Fault in Syria

Estimation of Coefficients of the 2D-Projective Transformation with the Cauchy-Function

Pioneers of Polar Aurorae in Hungary 1768–1910 and Spectral Research at Observatory Ógyalla by Konkoly-Thege

Electromagnetic Induction Profile (PREPAN95) from the East European Platform (EEP) to the Pannonian Basin

Recent Crustal Movements and Seismicity Studies Around Active Faults, Aswan, Egypt

Filter options

Publication date

Year

Keywords

INFONA - science communication portal

Acta Geodaetica et Geophysica

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Year

Keywords

Reporting an error / abuse

Sending the report failed

Accessibility options