ABSTRACT Management of waste disposal is a major issue that authorities had and still have to deal with. The construction of landfills used to be the main way to manage the great volume of waste. At the present time, the construction of... more
ABSTRACT Management of waste disposal is a major issue that authorities had and still have to deal with. The construction of landfills used to be the main way to manage the great volume of waste. At the present time, the construction of sanitary landfills is the dominant option in Greece, while old waste disposal sites where no protection standards had been followed still exist. In both cases, geological and hydrogeological setting of these areas is of a major importance. In this paper, two cases studies are presented. One case refers, to the active sanitary landfill of Thessaloniki where during the remediation of a new cell, underground water has been found. This was a major problem for the construction of the new landfill since water flow beneath the geomembrane can be destructive. The detection of the flow path and the confrontation of the problem was very important. Resistivity survey allowed the mapping of the underground water flow and appropriate measures have been taken according to the suggestions of the geophysical results. In the second case, an old waste disposal site has been investigated since outflows of leakage occurred. The flow paths of the leakage have been detected and remediation measures have been suggested.
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Research Interests: Geology, Paleontology, Sea Level, Multidisciplinary, Gravimetry, and 15 moreMiddle East, Deconvolution, Gravity Anomaly, Sediment, Data Integrity, Geophysical, Crust, Continental Crust, Lithosphere, Gravity Anomalies, Rifting, Bouguer Anomaly, Magnetic Anomalies, Oceanic crust, and Convergent boundary
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Summary The exploitation of chromite ore deposits in Greece is evident by the presence of many abandoned mines. The fresh interest by AKTOR S.A. in chromite ore deposits in Mt. Vourinos, N.Greece, is directly related to the boost in Cr... more
Summary The exploitation of chromite ore deposits in Greece is evident by the presence of many abandoned mines. The fresh interest by AKTOR S.A. in chromite ore deposits in Mt. Vourinos, N.Greece, is directly related to the boost in Cr prices controlled by international market trends.
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Summary The problem of rising moisture in historic walls is studied in terms of detection of the affected areas by GPR and ERT prospecting. The tests were carried out at the wall of a tower of the Heptapyrgion (Akropolis) fortress of... more
Summary The problem of rising moisture in historic walls is studied in terms of detection of the affected areas by GPR and ERT prospecting. The tests were carried out at the wall of a tower of the Heptapyrgion (Akropolis) fortress of Thessaloniki. The GPR survey was carried out employing 250 and 500MHz antennas along parallel transects of the wall. 2D GPR models were constructed and their response was computed to aid the attempted interpretation of the actual data. ERTs were also carried out along the same transects and the results compared to those of GPR. In general both methods agree with respect to the detection of areas of increased moisture content. Further, the condition of the interior of the walls can be assessed.
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Abstract The well-preserved Troodos ophiolite complex comprises the dominant element of the geology of Cyprus. Aeromagnetic data from a 1969 survey and a Bouguer anomaly map of Cyprus were processed to interpret the magnetic and gravity... more
Abstract The well-preserved Troodos ophiolite complex comprises the dominant element of the geology of Cyprus. Aeromagnetic data from a 1969 survey and a Bouguer anomaly map of Cyprus were processed to interpret the magnetic and gravity anomalies associated with the ophiolite rocks.
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ABSTRACT Magnetization differences in rocks are related with differences in the content of magnetic minerals within rock units. Assuming that magnetic properties (susceptibility and/or remanence magnetization) are discernible between the... more
ABSTRACT Magnetization differences in rocks are related with differences in the content of magnetic minerals within rock units. Assuming that magnetic properties (susceptibility and/or remanence magnetization) are discernible between the various rock units, magnetic field anomalies could provide valuable information for the texture of lithological units and even be correlated with distinct lithologies. Delineating edges of magnetized structures is a common application of magnetic data to geological interpretation. We evaluate a number of edge mapping techniques in order to study the magnetic anomaly caused by Philippi granitoid and to estimate its lateral extension. Edge mapping methods can definitely improve the interpretation of magnetic data. They can delineate the locations of the edges of the subsurface magnetic sources. Applied on the magnetic data of the Philippi granitoid edge mappers succeed to map the edges of the granitoid. The PSG-HGM mapper is a robust method that can detect contacts even in the presence of noise. TDXAS filter was able to detect signal from shallow and deeper contacts.
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ABSTRACT Airborne magnetic surveys provide a cost effective, quick and accurate way to map the subsurface distribution of magnetization for large, usually inaccessible, areas. Differences in magnetization of rock units are related with... more
ABSTRACT Airborne magnetic surveys provide a cost effective, quick and accurate way to map the subsurface distribution of magnetization for large, usually inaccessible, areas. Differences in magnetization of rock units are related with differences in the content of magnetic minerals within rock units (i.e. their magnetic susceptibility) and their remanent magnetization. Assuming that these properties are discernible between the various rock units, magnetic field anomalies could provide valuable information for the texture of lithological units and even be correlated with distinct lithologies. Here, we evaluate a number of edge mapping techniques applied on a part of the magnetic map of Macedonia and Thrace (N. Greece) in order to delineate the edges of the magnetic sources. The magnetic field anomaly which is studied is created by the so called Philippi granitoid. The mappers used comprise functions of the anomaly and its derivatives. The aimed in locating the lateral limits of subsurface magnetized granitoid.
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The studied area lies north of the city of Konitsa in Greece and includes the Albanian village of Koukes. Specifically, it lies between the geographic latitude (ö) 40ï 02' up to 40ï 07' and in geographic longitude (ë)... more
The studied area lies north of the city of Konitsa in Greece and includes the Albanian village of Koukes. Specifically, it lies between the geographic latitude (ö) 40ï 02' up to 40ï 07' and in geographic longitude (ë) 20ï 37' up to 20ï 45'. The geothermic field in Sarandaporos -Konitsa lies in the cross-border area between Albania and Greece. The
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Page 1. REGISTRATION OF GEOPHYSICAL IMAGES Alexandra A. Karamitrou Laboratory of Exploration Geophysics Aristotle University of Thessaloniki, Greece, alexakara@geo.auth.gr Maria Petrou Informatics & Telematics ...
Research Interests: Computer Science, Artificial Intelligence, Computer Vision, Magnetic Resonance Imaging, Image Registration, and 9 moreGeoscience and remote sensing, Stochastic Optimization, Mutual Information, Conductivity, Mathematical Model, Geophysical, Archaeological, Magnetic resonance image, and Similarity Geometry
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Nowadays gravimetric data are extensively interpreted by approximating the subsurface situation with simple polygonal structures. Algorithms to calculate the effect of such structures have been presented for bodies striking at right... more
Nowadays gravimetric data are extensively interpreted by approximating the subsurface situation with simple polygonal structures. Algorithms to calculate the effect of such structures have been presented for bodies striking at right angles to profiles under interpretation and having effectively infinite strike lengths, (Talwani, Worzei and Landisman 1959). Such methods have been termed 2-D. A slight modification of the method was used to interpret three-dimensional bodies (Talwani and Ewing 1960). Methods have also been proposed in order to overcome the disadvantage of the infinite strike length in 2-D interpretation. Such techniques, supposing finite strike lengths, are termed 2 1/2-D interpretational methods (Cady 1980). The microcomputer program presented in this work is based on the method proposed by Tsuboi, Tomoda and Aki (Tomoda and Aki 1955; Tsuboi 1983). It is a 2-D method for determining directly from gravity data the depth to a single density interface. It consists of calculating the deviation of the interface from mean depth by means of excess mass under each point on a profile where the gravity anomaly has been measured.
Research Interests: Geology and Microcomputer
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Several thermal manifestations have been recorded in the area where the river Nestos forms its delta in northern Greece. The geophysical research presented here had as its objective the study of the trend of the deep basement. It... more
Several thermal manifestations have been recorded in the area where the river Nestos forms its delta in northern Greece. The geophysical research presented here had as its objective the study of the trend of the deep basement. It consisted of 26 deep soundings of maximum current spacing AB/2 = 3000 m and the interpretation of gravity anomalies along some profiles drawn on the Bouguer anomaly map. Two-D gravity and geoelectrical models revealed the presence of intense tectonic activity. Geothermal interest is focused on some concealed horsts.
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Inversion filters can be computed on the basis that a particular signal can be considered as the convolutant of two distinct and analytically determined functions. Therefore, if such filters are convolved with the measured field, they... more
Inversion filters can be computed on the basis that a particular signal can be considered as the convolutant of two distinct and analytically determined functions. Therefore, if such filters are convolved with the measured field, they provide the distribution of the function which was not inverted. If the non-inverted function has been chosen in a manner to define the surface projection of the buried target, a plan view of the subsurface conditions has been provided.
Research Interests: Geology and Prospecting
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ABSTRACT Compressional velocity structure of the crust and the upper mantle in south-eastern Europe (broader Aegean area) is studied by inverting residuals of the first P arrivals from earthquakes in this region (16°E-31°E, 34°N-43°N).... more
ABSTRACT Compressional velocity structure of the crust and the upper mantle in south-eastern Europe (broader Aegean area) is studied by inverting residuals of the first P arrivals from earthquakes in this region (16°E-31°E, 34°N-43°N). The data used are from regional events recorded by the permanent network of stations during the period 1971-1987, enriched with data from experiments with portable seismographs in four regions of this broad area. This study confirms the strong variations of crustal thickness in this area as well as the subduction of the eastern Mediterranean lithosphere under the southern Aegean and gives further detailed information on the crustal and upper mantle structure of the area. Important new information is the existence of a low-velocity crustal layer in western Greece and Albania and that the velocity anomaly in the mantle under the southern Aegean extends much farther and deeper to the northeast than the Benioff zone of the intermediate depth earthquakes indicates. Furthermore, evidence is presented about the possible existence of older subduction in the northern Aegean and about the influence of the tectonic regime on the velocity field.
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A non destructive ERT survey at the south wall of Acropolis at Athens is described. The survey aimed to investigate the area behind the wall mainly to image the ways that the water is drained downwards from the Acropolis hill. This is... more
A non destructive ERT survey at the south wall of Acropolis at Athens is described. The survey aimed to investigate the area behind the wall mainly to image the ways that the water is drained downwards from the Acropolis hill. This is major threat for the integrity of the monument evidenced already by the distortion of the wall. Several technical issues were encountered performing a survey on a wall. Further, modifications to the inversion algorithm had to be implemented. The results comprise images of the water ways.
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Nikos Papadopoulos, Gregory Tsokas, Apostolos Sarris, Panagiotis Tsourlos and George Vargemezis assess the preservation of standing monuments and ancient water management facilities. Archaeological prospection or archaeogeophysics... more
Nikos Papadopoulos, Gregory Tsokas, Apostolos Sarris, Panagiotis Tsourlos and George Vargemezis assess the preservation of standing monuments and ancient water management facilities. Archaeological prospection or archaeogeophysics includes the diverse geophysical methods employed either in planned excavations to guide the archaeological research in advance of and during the excavation process or in salvage excavations to provide a rapid assessment during the development of infrastructure in urban or rural environments. On a more general basis, these techniques are also applicable to support regional archaeological surveys by locating areas of archaeological interest and contributing to the settlement pattern analysis (Sarris and Jones, 2000). Unlike the destructive nature of the archaeological excavations, geophysical prospection techniques are non-invasive, providing at the same time a rapid reconnaissance of a site without disturbing the ground or the monuments themselves. The success or the failure of these techniques strongly depends on the contrasting physical properties that exist between the archaeological buried targets and the hosting material.
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The study area is a part of Dammam Dome that is situated at King Fahd University of Petroleum & Minerals (KFUPM) campus, Dhahran, Kingdom of Saudi Arabia. The gravity survey was conducted as a pilot case study to explore part of... more
The study area is a part of Dammam Dome that is situated at King Fahd University of Petroleum & Minerals (KFUPM) campus, Dhahran, Kingdom of Saudi Arabia. The gravity survey was conducted as a pilot case study to explore part of Dammam Dome in greater detail. Gravity data were collected solely during night hours due to low noise levels. A significant part of the survey was conducted during the summer holiday period, , when there was no student are on campus. A total of 235 gravity measurements were made using a Scintrex CG5 gravitometer, while a Trimble R10+ differential GPS (DGPS) was used to measure the stations’ location and elevation with the highest accuracy. All gravity data were reduced using several algorithms, and their outcomes were cross-compared. The Complete Bouguer anomaly map for the campus was then generated. Several enhancement filters including edged detection and shallow to deeper source separation were applied. Data were inverted, and 2.5D and 3D models were created to image the subsurface conditions. The main purpose of this study is to better understand the subsurface geology, tectonic settings of the Dammam Dome by applying the high-resolution gravity method before carrying out any comprehensive geophysical (seismic) 3D survey.
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Research Interests: History, Archaeology, Ground Penetrating Radar (GPR), Documentation, Bronze Age Europe (Archaeology), and 10 moreArchaeological Prospection, Near surface Geophysics, Bronze Age, Geophysical Prospection, History and archaeology, Santorini, Akrotiri auf Thera - Akrotiri on Thera, Prospection, Geopysics, and Akrotiri
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Research Interests: Archaeology and Curvelet
This work uses two, and three-dimensional Electrical Resistivity Tomographies (ERTs) applied on standing monuments to investigate moisture presence and possible moisture migration through time-lapse monitoring. The whole process was... more
This work uses two, and three-dimensional Electrical Resistivity Tomographies (ERTs) applied on standing monuments to investigate moisture presence and possible moisture migration through time-lapse monitoring. The whole process was applied to one of the main pillars in Thessaloniki’s Rotunda (Central Macedonia, Greece). Two-dimensional ERTs applied along a single line directly on the wall. Small diameter stainless steel nails were used as electrodes and were inserted into the mortar of the monument in order not to damage the structure. In addition, three dimensional ERT synthetic models were produced with conventional and non-conventional optimized array protocols. The synthetic models provided helpful information about the best possible electrode layout for further real three dimensional ERT time-lapse investigation of the structure. Inversion results from two-dimensional and three-dimensional ERTs provided helpful information about the pillar’s current status, and the resistivity variations over time may indicate moisture migration inside the wall.
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<p>This paper presents a general overview of gravimetric measurements carried out for the first order gravimetric network of... more
<p>This paper presents a general overview of gravimetric measurements carried out for the first order gravimetric network of Albania.   Data compensation, correction methodologies, interpretation and related results have been presented as well. Relative gravimetric measurements were carried out in 42points,  with two CG-5 instruments. Real Vertical Gradients have been measured at all the points of first order network which together with other corrections,  are used in the final data compensation in order to bring the final values at reference point as absolute ones. Apart from the first order network, other 38 second order and 138 third order gravimetric points have been measured in a grid 2x2 km, in the  flat and most dense area (Tirana-Durresi) of Albania,  with the  scope the determination of  Geoid Gravimetric Height on that region. The gravimetric measurements were realized with two Scintrex CG-5 gravimeters for three orders. For the first order points were used two gravimeters simultaneously, whereas for the points of second and third order only one. In this paper we present the results for only the first order measurements. The measurements were carried out during the period from August to October 2018, in collaboration with Aristotle University of Thessaloniki, Department of Geophysics. The project was supported by the Agency of Geospatial Information of Albania.</p>
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Page 1. PP 6.7 A comparison between inverse filtering and multiple source Werner deconvolution Gregory N. Tsokas *, Aristotelian University of Thessaloniki, Greece; Richard 0. Hansen, Pearson deRidder and Johnson Inc. Introduction ...
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Rapport sur les campagnes 2012-2013 aux abords Nord de l'Artémision de Thasos. Résultats sur la demeure protobyzantine DOM5 (en particulier : phasage du chantier d'agrandissement du triklinos ; destruction par un seîsme en 620 ;... more
Rapport sur les campagnes 2012-2013 aux abords Nord de l'Artémision de Thasos. Résultats sur la demeure protobyzantine DOM5 (en particulier : phasage du chantier d'agrandissement du triklinos ; destruction par un seîsme en 620 ; environnement de la demeure) et sur les édifices qui l'ont précédé (BAT25, d'époque archaïque, et BAT24, en usage du IVe s. av. J.-C. jusqu'à son intégration dans l'aile Nord de la demeure protobyzantine DOM5).
Research Interests: Archaeology, Late Antique and Byzantine Studies, Byzantine Archaeology, Housing and Dwelling (Architecture), Greek Archaeology, and 10 moreLate Roman Archaeology, Ancient Mosaics, Archaeomagnetism, Archaeomagnetic Dating, Architecture and urbanism, Restauration and Conservation, Mosaic Restoration and Conservation, Archeometallurgy, Roman Mosaics, and Chantiers Moyen Age
I have been a panel coordinator at the international conference, entitled "Troy-Tenea-Rome. Mythological and historical itineraries meet for the first time" which was held on December 5, 2019 in Corinth, Greece. Other coordinators of the... more
I have been a panel coordinator at the international conference, entitled "Troy-Tenea-Rome. Mythological and historical itineraries meet for the first time" which was held on December 5, 2019 in Corinth, Greece. Other coordinators of the panel 3 were Anastasia Gadolou, P. Panagiotis Iossif, Christina Papageorgopoulou and N. Grigorios Tsokas. The conference was organized by the Tenea Project, headed by Elena Korka.
Research Interests: Archaeology, Classical Archaeology, Classics, Greek History, Roman History, and 15 moreAnatolian Archaeology, Greek colonies in Magna Graecia, Greek Colonisation, Greek Archaeology, Ancient Greek History, Greek religion (Classics), Anatolian Archaeology (Archaeology), Ancient Greece (History), Ancient Greece, Greek Colonization (Magna Graecia and Sicily), Classics: Ancient History and Archaeology, Arqueología romana / Roman archeology, Ancient Greece and Rome, Excavations, and Roman Archaeology
In Honor of Prof. Liritzis Ioannis: Essays in Archaeology & Archaeometry and the Hellenic Contribution to Egyptology