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Del Ventisette C.,University of Florence | Ciampalini A.,University of Florence | Manunta M.,CNR Institute for Electromagnetic Sensing of the Environment | Calo F.,CNR Institute for Electromagnetic Sensing of the Environment | And 23 more authors.
Remote Sensing | Year: 2013

In the last few years, several advances have been made in the use of radar images to detect, map and monitor ground deformations. DInSAR (Differential Synthetic Aperture Radar Interferometry) and A-DInSAR/PSI (Advanced DInSAR/Persistent Scatterers Interferometry) technologies have been successfully applied in the study of deformation phenomena induced by, for example, active tectonics, volcanic activity, ground water exploitation, mining, and landslides, both at local and regional scales. In this paper, the existing European Space Agency (ESA) archives (acquired as part of the FP7-DORIS project), which were collected by the ERS-1/2 and ENVISAT satellites operating in the microwave C-band, were analyzed and exploited to understand the dynamics of landslide and subsidence phenomena. In particular, this paper presents the results obtained as part of the FP7-DORIS project to demonstrate that the full exploitation of very long deformation time series (more than 15 years) can play a key role in understanding the dynamics of natural and human-induced hazards. © 2013 by the authors.

Trumpy E.,CNR Institute of Geosciences and Earth Resources | Coro G.,National Research Council Italy | Manzella A.,CNR Institute of Geosciences and Earth Resources | Pagano P.,National Research Council Italy | And 6 more authors.
International Journal of Digital Earth | Year: 2015

Geothermal data are published using different IT services, formats and content representations, and can refer to both regional and global scale information. Geothermal stakeholders search for information with different aims. E-Infrastructures are collaborative platforms that address this diversity of aims and data representations. In this paper, we present a prototype for a European Geothermal Information Platform that uses INSPIRE recommendations and an e-Infrastructure (D4Science) to collect, aggregate and share data sets from different European data contributors, thus enabling stakeholders to retrieve and process a large amount of data. Our system merges segmented and national realities into one common framework. We demonstrate our approach by describing a platform that collects data from Italian, French, Hungarian, Swiss and Icelandic geothermal data providers. © 2015 Taylor & Francis

Kovacs P.,Magyar Foldtani Es Geofizikai Intezet MFGI | Csontos A.,Magyar Foldtani Es Geofizikai Intezet MFGI | Heilig B.,Magyar Foldtani Es Geofizikai Intezet MFGI | Hegymegi L.,MinGeo Kft. | And 3 more authors.
Magyar Geofizika | Year: 2012

Tihany Geophysical Observatory was founded in 1954 to monitor geomagnetic variations. In addition to its original task, however, it has always provided opportunity for other geophysical activities, such as observation and study of paleomagnetic, geothermic, seismologic, and different space phenomena. Geomagnetic data, gathered since 1954 provide an excellent data base for investigating magnetic variations at various time-scales ranging from a few seconds (pulsations) to several decades (secular variations). The investigation of the secular variations in the observatory is complemented, from time to time, by secular or national network campaigns. While fast geomagnetic variations inform on the dynamic processes of the Sun-Earth system, secular variations provide information on the internal processes of the Earth. Study of the dynamics of the space environment is promoted by the recording of ULF and VLF magnetic and electromagnetic phenomena. The observatory contributed to the development of some magnetic instruments and data recording system, as well. Tihany Geophysical Observatory is one of the founding members of INTERMAGNET, the worldwide network of observatories. It coordinates the MM100 meridional magnetometer array organized for monitoring the dynamical state of the plasmasphere. Currently, the network is complemented by new stations and merged with the SEGMA array, within the framework of an EU FP7-funded project, PLASMON, under the name of EMMA. The ULF records of EMMA observatories, together with VLF observations of other stations, are aimed at real-time modeling of the equatorial mass density profile of the plasmasphere. Within the framework of the forthcoming STORM FP7 project, the nonlinear dynamics of the solar system plasma will be studied using records of current ESA and NASA space missions.

Janos K.,Magyar Foldtani es Geofizikai Intezet MFGI | Andras M.,Magyar Foldtani es Geofizikai Intezet MFGI
Magyar Geofizika | Year: 2012

Geophysical data processing and interpretation along regional deep seismic refraction profiles (like CEL07 and CEL08) were published in previous issues of Hungarian Geophysics. The construction of geophysical base-maps and base-profiles at Geophysical Mapping Division of Eötvös Loránd Geophysical Institute is going on for a long while. This study presents the gravity, magnetic and magnetotelluric data, their processing and our non-seismic interpretation results comparing with the seismic reflection section of PGT-1 profile. It shows that vertical exaggeration of a seismic section may lead to new seismic interpretation. © 2012 Magyar Geofi zikusok Egyesülete.

Kiss J.,Magyar Foldtani Es Geofizikai Intezet MFGI | Guthy T.,Magyar Foldtani Es Geofizikai Intezet MFGI | Zilahi-Sebess L.,Magyar Foldtani Es Geofizikai Intezet MFGI
Magyar Geofizika | Year: 2015

Since its discovery in 1909, the investigation of the Mohorovičić (Moho) discontinuity is one of the primary objects of geophysical research. The Moho research in Hungary began with a considerable success: Gálfiand Stegena (1955, 1957, 1960), using large explosive sources in drill-holes have obtained reflections from the crust-mantle boundary. Their results were novelty when they published them in Europe. Later, Hungarian geophysicists succeeded in observing seismic reflection arrivals from the upper mantle and in determining the depth of the lithosphere-asthenosphere boundary. The principal aim of Moho research was to become acquainted with the structure of earth crust. Later this research became important because of the aspects of geothermal and plate tectonics studies, too. Carpathians (and the Carpathian Basin) located in the Alpine orogenic zone have developed due to considerable crust motions. Knowledge of Moho's structure may contribute to understanding these geodynamical processes. This article summarizes the different phases of Moho studies in Hungary, from the birth of Moho's first depth map up to the present days; from the several published seismic Moho maps up to the different gravity studies of Moho's effects. We present maps got by different processing of gravity data and correlat them with the Moho depth maps based on seismic data. We show also a map of Moho's depth calculated by using the Airy-Heiskanen isostatic model. © 2015 Magyar Geofizikusok Egyesülete.

This is our third paper in the theme of spectral analysis. Our subject of investigation in this case is the Hungarian Bouguer anomaly map. In a previous paper published in Hungarian Geophysics, we studied the signatures of Bouguer anomaly map of Carpathian- Pannonian Region, and we determined wide minimum zones across Pannonian Basin interpreted by us as deep shear zones. These minimum zones spaded the spacious gravity maximum of the Pannonian Basin overwriting the effect of isostasy. The Hungarian gravity dataset including more than 385.000 stations has a better spatial resolution of gravity field than the previous dataset of Carpathian-Pannonian Region. We studied this dataset by spectral analysis, too: 1) to check the previous result, and 2) to get new geological information. The depth slicing of Bouguer anomaly map and the interpretation of different filtered maps can be useful from point of view of structural geology. Different utility areas (crustal and basement blocks) can be interpreted using the supposed density distribution of the depth-sliced Bouguer anomaly maps. © 2014 Magyar Geofizikusok Egyesülete.

Bodoky T.,Magyar Foldtani Es Geofizikai Intezet MFGI | Kiss J.,Magyar Foldtani Es Geofizikai Intezet MFGI
Magyar Geofizika | Year: 2014

The paper points out that, if the gravity Bouguer anomaly map of NW-Hungary is studied, then between the city of Pápa and the Somló hill a large negative anomaly can be seen, which resembles the gravity anomalies of the proven terrestrial impact craters of similar size. Results of different processing of gravity data and other available geophysical data of the area of that anomaly and its surroundings confirm that a buried round structure of 20-25 km diameter can be found here, which shows features typical for terrestrial impact craters. © 2014 Magyar Geofizikusok Egyesülete.

In the present article first we review the knowledge about the plate tectonics by a special examination of the ocean-ocean and ocean-continent conversions of plates - the former one is interesting from point of view of the calc-alkaline volcanism, the latter one from point of view of the mountain range formation. We establish that the phenomena of plate tectonics are followed by calc-alkaline volcanism and by obduction of oceanic crust; they both may appear as effective magnetic source bodies. Another magnetic source body of the region can be the basalt of the continental rift zones as well. We examined the magnetic anomaly map of Europe and we prepared a primarily visual - i.e., a little bit subjective - lineament detection in the anomaly map. There is a good correspondence between the interpreted magnetic and the gravity lineaments presented earlier. They reflect the geodynamical processes influenced by the magnetic/gravity effects. We develop some (structural) models based on the position of the known surface volcanism and the hardly known buried ones, which are in harmony with the magnetic anomaly map and they explains the momentary and the presupposed locations of volcanic rocks in different geological times. We did not manage to find solution for all problems, but we may possibly contribute to the common thinking by this article. © 2014 Magyar Geofizikusok Egyesülete.

Kiss J.,Magyar Foldtani Es Geofizikai Intezet MFGI | Bodoky T.,Magyar Foldtani Es Geofizikai Intezet MFGI
Magyar Geofizika | Year: 2015

The paper studies the driving forces of subductions of lithospheric plates. Plate movements and plate driving forces are briefly reviewed, density differences caused by cooling are numerically studied and mantle convections are looked over. It reaches the conclusion that the role of mantle convections at subductions is much more significant than that of density differences. © 2015 Magyar Geofizikusok Egyesülete.

Optimized pseudo-random sequences are calculated and tested for the purpose of reducing possible damage to buildings by vibratory sources during seismic reflection acquisitions. The common linear sweeps used at vibratory measurements cause resonance in infrastructure, hence the potential for damage increases. A pseudo-random sweep signal can be a natural choice to decrease resonance effects, but the sequences produced by simple random number generators have disadvantages. In this paper requirements are set and an optimization process is employed for producing pseudo-random sweeps to achieve satisfactory results. Two strategies are considered for pre-processing: autocorrelation and deconvolution. Analysis of optimum sweep examples shows that the peak energy is increased, while side-lobe energy is decreased compared to a simple pseudorandom sweep. Field tests reveal that the peak particle velocity values are reduced substantially, while correlated and deconvolved records are of similar quality compared to a linear sweep driven record. © 2013 Magyar Geofizikusok Egyesülete.

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