bluuebunny/crossref_metadata_2025 huggingface dataset:
ON COAST LINE OSCILLATIONS DURING LAST DECADES. BORSHI BEACH CASE, ALBANIAN RIVIERA
Authors: Marku S. , Doda V.
Published: July 2017

The oscillations of coast line in Albania, and simultaneously the Quaternary deposits in Albania were little studied until the decade of 90th of 20th century. Up to now, the studies consider those deposits as fluvial sediment; meanwhile, the coast line was categorized as of erosional and accumulative type. In those studies, the role of sea waves and euastatic change of sea level in the process of sediment supply in coastline is neglected. Transgression and regression was interpreted according to Theory of Geosynclinals, as tectonic subsidence or uplift of continental area. From observations in Borshi beach, during August 2013 and September 2015, result that the sediment in this area originate mainly from the erosion of coast line rocks, and less from sediments transported by continental flows. Some traces of marine sediments inside the continental area, in ahigher hypsometric quote regarding the actual coastline traces of erosion in some infrastructure works dated of the decade 70’ and 80’ of 20th century, are argument of a temporal rise of sea level during the decade 90’ of past century.
GEOMETRY OF HOLOCENE TIDAL NOTCHES – SEA LEVEL MARKERS AT PERACHORA PENINSULA, GULF OF CORINTH, GREECE
Authors: Schneiderwind S. , Kázmér M. , Boulton S. , Papanikolaou I. , Reicherter K.
Published: July 2017

Tidal notches are a generally accepted sea level indicator that, when different from mean sea level, witness tectonic activity at or near coastlines. However, how to infer related information is controversial since tectonic uplift from a single seismic event is not likely to exceed several decimetres. High resolution laser scanning offers the availability of close-up views on exposures and to detect evidence for multiple sea level indicators in between major emergence. Statistically representative profiles along exposure were analysed in order to prove for already described tidal notches and to highlight similar shapes in consistent geometries along coastal cliffs of Perachora Peninsula.
PALAEOSEISMOLOGICAL INVESTIGATION OF THE GYRTONI FAULT (THESSALY, CENTRAL GREECE)
Authors: Tsodoulos I. , Chatzipetros A. , Koukouvelas I. , Caputo R. , Pavlides S. , Stamoulis K. , Gallousi C. , Papachristodoulou C. , Ioannides K. , Belesis A. , Kremastas E. , Kalyvas D.
Published: July 2017

Two paleoseismological trenches were excavated across the Gyrtoni Fault in NE Thessaly and studied in order to understand the recent seismotectonic behavior of this structure. Twenty five fluvial-colluvial sediment and pottery samples from both the upthrown and the downthrown fault blocks were investigated. Optically Stimulated Luminescence (OSL) dating has been applied to date both sedimentary depositspalaeosoils and pottery fragments. Paleoseismological analysis of the two trenches indicates evidence of three surface faulting events in the time span between 1.42 ±0.06 ka and 5.59 ± 0.13 ka. The observed vertical displacement per event of ~0.50 m corresponds to an Mw 6.5 ± 0.1 earthquake. An average fault slip rate of 0.41 ± 0.01 mm/yr and an average recurrence of 1.39 ± 0.14 ka for earthquakes were estimated. The results documented the activity of the fault and since the return period from the most recent event (minimum age 1.42 ± 0.06 ka) has expired, the possibility for reactivation of this active structure in the near future should be included in Seismic Hazard Assessment.
LANDSLIDES IN VITSI (FLORINA) TERRITORY
Authors: Ambas V.Ch. , Katsaros E.E. , Alexoudi M.N. , Olasoglou E.M. , Tsapanos T.M. , Koravos G.Ch. , Drakatos G.N. , Tzamos E.I.
Published: July 2017

Landslides can provoke lifeline’s performance malfunction, injuries or fatalities and may diminish accessibility to critical facilities and surrounding properties. The scope of this research is to describe and to identify the triggering factors for three landslides along the road from Drosopigi village to the top of Vitsi Mountain at Florina territory using all the available data. Several information were collected for this area, such as the annual rate of the rainfall/ snowfall, the rainfall intensity/day, the seismicity, the geomorphology, the geology, the lithology and the hydrologic conditions. Moreover, in-situ investigations of the landslides, geotechnical and laboratory tests were carried out in three geotechnical boreholes to indentify the soil formations nearby the landslides. Taking into account that the landslides are located 18km, 22km and 25km,away from the epicenters of two historical earthquakes with magnitudes Mw= 6.0 και 6.5 and also that last winter heavy rainfalls/snowfalls were observed in the area with very low temperatures (-15OC), slope’s failure may have been triggered by an earthquake, by snowfalls/rainfalls or by human activities?
APPLICATION OF TERRESTRIAL LASER SCANNING (LIDAR) IN ROCK SLOPE STABILITY. ΑΝ ΕXAMPLE FROM NORTHERN GREECE
Authors: Ampatzi G. , Chatzigogos N. , Makedon M. , Papathanassiou G. , Marinos V.
Published: July 2017

The scope of this study is to investigate the failure mechanisms of the eastern coastal zone of Mount Athos, using the LiDar device for the 3D mapping of the structural features of the rock mass. Therefore emphasis was given to the study of the planes of discontinuities that can trigger potential failures. All slopes were scanned by LiDar device in order to capture their structure and especially the orientation and the spacing of the discontinuities. The data were processed in order to produce the microtectonic model of the slopes and evaluate the potential slope failures. Finally some remedial measures are proposed.The results and the reliability as well as the constrictions of the applied methodology are discussed for future applications.
INVESTIGATION OF FAILURES AND VERTICAL DISPLACEMENTS OCCURRING AT THE CHOREMI VILLAGE, NEAR THE MEGALOPOLIS’ MINES
Authors: Avramidou E. , Psychari E. , Kanaris D. , Tzampoglou P. , Loupasakis C.
Published: July 2017

The current study investigates the catastrophic phenomena affecting Choremi village, at the west boundaries of the Megalopolis’ mines. For this purpose, field survey was carried out, failures in the houses were recorded, the level of aquifer was measured and soil samples were collected for the conduction of laboratory tests and mineralogy analysis. The conclusions of the investigation were verified by slope stability analysis. By evaluating all available data, it is clear that the displacements damaging the village occur due to slope failure and swelling of the clay formations of the narrow study area.
HYDROCHEMICAL STUDY OF THE HOT GROUNDWATER OF AMPELIA AREA, EASTERN THESSALY, GREECE. A NEW AREA WITH GEOTHERMAL INTEREST
Authors: Kanellopoulos C. , Christopoulou M. , Vakalopoulos P. , Efthimiopoulos Th. , Xenakis M.
Published: July 2017

Ampelia area is a newly discovered area with geothermal interest and no surface manifestations (hidden resource). It is located in Farsala basin and belongs to the Enipeas graben. The geothermal anomaly is related with the E-W trending faults, which mainly control the basin development and the NNW-SSE trending faults of the area. The temperature values from the deep water boreholes (>200m depth) range from 20 to 41oC. The chemical composition of the studied groundwater samples varies in all chemical parameters. Most of the samples have affected by shallow cold aquifers (high E.C. and NO3- values). The most representative samples (T > 30oC) are from the deepest boreholes (hydrochemical type Na-HCO3), which cut the fractured crystalline basement, i.e. limestones, flysch and ophiolitic rocks. They present the highest pH values (pH > 8) and the lowest E.C. compared with the rest of the samples. Their Ni and Cr concentrations are very low, indicating that the groundwater is notin contact with the ultramafic rocks from the ophiolite sequence. According to silica chemical geothermometers for the most representative samples, the expected temperature values of a potential geothermal reservoir range from ~ 60 to 100oC.
SIMULATION OF THE GEOTHERMAL RESERVOIR OF THERMA - NIGRITA, CENTRAL MACEDONIA, GREECE
Authors: Kavouri K. , Arvanitis A. , Athanassoulis C. , Xenakis M.
Published: July 2017

The geothermal field of Therma - Nigrita is among the most important low enthalpy fields in Greece. It is located at the SW part of the Strymon basin (Central Macedonia). The geothermal research at Nigrita was launched by IGME during 1980- 1982. Actually, it is exploited mainly for agricultural use and thermal spa. The geothermal field of Therma - Nigrita, officially characterized by Ministerial Decision, covers an area of 10 km², has a pressurized reservoir at 70-500 m depth, showing temperatures of 40-64°C and geothermal fluids containing large amounts of CO2. In this paper the development of a 3D model for the reservoir of Therma - Nigrita, is presented. For this purpose the FEFLOW code is employed which simulates fluid flow and heat transfer in the geothermal reservoir under transient state conditions. Following, three different management scenarios are tested for a ten-year period. The first scenario examines the evolution of the reservoir under no-exploitation conditions, the second one represents the current exploitation scheme and in the third scenario the production rates are doubled. According to the simulation results, the decrease in temperature is not expected greater than 1% for all scenarios, while the effect on hydraulic heads is significant for both scenarios 2 and 3.
SAND AS A SOIL STABILIZER
Authors: Kollaros G. , Athanasopoulou A.
Published: July 2017

Clayey soils often exhibit undesirable engineering behaviour such as low strength, swelling and shrinkage characteristics etc. To improve these properties, the common method followed is stabilization. An experimental program carried out in this study aims to highlight the physical mechanisms of stabilization of an expansive soil by adding an inert material (sand). The study aimed to analyze the effect of stabilization on the variation of soil consistency and the results have shown that soil consistency improved appreciably. The findings of the laboratory testing procedures also presented substantial improvement in strength with the addition of sand percentages up to 60% by weight of soil, as well a noticeable alteration in the moisture-density relation. The soil tested could be used as subgrade material in pavement structures for low volume bearing roads, after its stabilization with fine sand. A further step in the investigation process could be the analysis of the swelling potential of clayey soils in conjunction with the addition of other waste materials along with sand, as well as the cost-benefit relationships of stabilization with sand in large projects like the highway construction.
DISTRIBUTION OF RARE EARTH ELEMENTS IN METAMORPHIC ROCKS OF PLATTENKALK GROUP AT CENTRAL CRETE, GREECE
Authors: Stathogianni F. , Manoutsoglou E. , Staboliadis I. , Pantelaki O. , Kallithrakas-Kontos N.
Published: July 2017

Within the metamorphic rocks of the Plattenkalk Group, in an occurrence at Tallaia Mountains, central Crete, light rare earth elements Cerium and Lanthanum are found. The studied rare earths are seen in an epidote group mineral, allanite. Scanning Electron Microscopy of the samples showed clearly the crystals of allanite (prekinematic crystals) and their grain size. Mineral processing was conducted for the size fractions: (<10 μm), (10-212 μm) and (212-1000 μm), according to the magnetic properties and grain size of allanite. After magnetic separation of the fraction (<10 μm) and (212-1000 μm) rare earths Ce and La were observed to have higher concentrations in the magnetic products. In conclusion, (according to the microscopic and mineral processing data) the optimum grain size for the beneficiation of allanite is the size fraction (10-212 μm).
LABORATORY INVESTIGATION ON THE CORRELATION BETWEEN THE FRICTION ANGLE OF ROCK JOINTS AND THE CONSTANT MI OF THE HOEK AND BROWN CRITERION
Authors: Tsikrikis A. , Papaliangas T. , Marinos V.
Published: July 2017

A correlation between the non-dilational friction angle (φm) of rock discontinuities and the constant mi of the Hoek and Brown criterion for intact rock is investigated, using the results of a focus oriented laboratory program. The program consisted of two types of laboratory tests: a series of triaxial compression tests on intact rock samples for the determination of the constant mi and an independent series of direct shear tests on tensile fractures of the same rock types for the determination of the rock joint friction angle φm. Four typical rock types from Northern Greece were used: a granite, a sandstone, a limestone and a marble, covering a range of mi between 8 and 34, and an unconfined compressive strength between 60 and 120 MPa. Apart from the certain range of parameters that is presented for this specific rocks, the experimental results show that the non-dilational friction angle of the rock fracture determined by direct shear testing (φm) decreases logarithmically with the value of the constant mi.
GEOLOGICAL MAPPING IN URBAN AREAS. A CASE STUDY FROM THE INNER CITY OF THESSALONIKI, GREECE
Authors: Zervopoulou A. , Pavlides S.
Published: July 2017

The methodology of geological mapping in urban areas differs from the ordinary field research. An urban area has no outcrops, has a smooth surface, diverted water lines and covered geology. The data types commonly collected in urban areas are from few outcrops (if there are some), borehole records, geophysical prospecting data, geological maps, digital elevation models (DEM), shallow excavations, palaeoseismological trenches and publication archives. This research at subsurface of the city produces new thematic maps for the initial surface under the building area, the water network, the geology and finally the fault system. This paper demonstrates a methodology and provides a way to solve engineering geology problems in urban areas.
CHANGES IN PARAMETERIZATIONS OF REGIONAL CLIMATE MODEL REGCM4.4.5: THE ROLE OF LAND COVER ON REGIONAL CLIMATE OVER MEDITERRANEAN
Authors: Velikou K. , Tolika K. , Anagnostopoulou Ch.
Published: July 2017

A parameter that affects significantly the local, regional and global climate system is land cover and the changes that may occur to it. During winter season, heavy precipitation assists vegetation growth of Mediterranean forests and woodlands, whereas during summer, absence of precipitation and severe heat waves result to arid and semiarid vegetation. For that reason, it was quite interesting to track the changes that may occur in the climate of the Mediterranean region due to land cover/land use changes on regional climate over the Mediterranean region. The main objective of the study is the assessment of the impacts of land cover/land use changes on regional climate over the Mediterranean region. The examined regional climate model used in the study is RegCM4.4.5. Its spatial resolution is 25x25km and different simulations were performed with changes in land cover/land use for the time period 1981-1990. The different simulated data were compared in order to examine the modifications that occur from land cover/land use changes in evapotranspiration and surface albedo to direct and diffuse radiation in the domain of study.
ACCELEROMETRIC DATA AND WEB PORTAL FOR THE VERTICAL CORINTH GULF SOFT SOIL ARRAY (CORSSA)
Authors: Kassaras I. , Roumelioti Z. , Ktenidou O.-J. , Pitilakis K. , Voulgaris N. , Makropoulos K.
Published: July 2017

Strong motion data recorded during the 15-year operation of the CORinth Gulf Soft Soil Array (CORSSA) in the highly seismic region of Aegion have been homogenized and organized in a MySQL database. In the present work we describe the contents of the database and the web portal through which these data are publicly accessible. CORSSA comprises one surface and four downhole 3-D broadband accelerometric stations. It was installed in 2002, in the framework of European project CORSEIS, aiming at gathering data for studying site effects, liquefaction, and non-linear behaviour of soils, as well as earthquake source properties. To date, the array has recorded 549 local and regional events with magnitudes ranging from 1.1 to 6.5. Although the vast majority of the recorded events caused weak ground motion at the CORSSA site, the scientific value of the data set pertains to the sparsity of this kind of infrastructure in most parts of the world.
DIONYSOS SATELLITE OBSERVATORY AND HIGHER GEODESY LABORATORY: HISTORY AND PERSPECTIVES
Authors: Marinou A. , Anastasiou D. , Papanikolaou X. , Paradissis D. , Zacharis V.
Published: July 2017

Dionysos Satellite Observatory and Higher Geodesy Laboratory have been in operation since the 60s and their main objective is to fulfill academic and research needs, determined through the ongoing scientific and technological advance in the field of geodesy. They are involved in all scientific domains related to the determination of earth’s size and figure, as well as its temporal variations. Their field of expertise is Satellite Geodesy, (spanning a wide range of applications like reference systems, tectonic geodesy, etc.), as well as the study of the geoid and earth's gravity field.
THE 16 APRIL 2015 MW6.1 EARTHQUAKE SEQUENCE NEAR KASOS ISLAND AT THE EASTERN HELLENIC SUBDUCTION ZONE
Authors: Kiratzi A.A.
Published: July 2017

Broad band seismic waveforms are used to determine the source model of the 16 April 2015 (UTC 18:07:44) earthquake, Mw6.1, which occurred 14 km SW of Kasos Island, in the eastern Hellenic subduction zone. The mainshock is connected with oblique leftlateral motion on a reverse fault, dipping to SE. Most of the aftershocks are compatible with strike-slip or oblique normal faulting, with the T-axes showing along arc extension. A finite fault slip inversion was performed, allowing for the rake angle to vary across the fault, to capture the variation in the slip vectors. The rupture initiated in the lower crust, at a centroid depth of 23 km, and propagated mainly towards SW. The slip is confined in depth within ~17km and 27km, mainly in a single asperity, with the peak slip of the order of 60 cm. The slip model provided synthetic seismograms which matched satisfactory the observed, and with forward modelling the ShakeMap was calculated. The 2015 Kasos earthquake sequence is compatible with shear motions parallel to the strike of the subduction zone. It provides evidence that part of the deformation in the eastern Hellenic subduction is taken up by the simultaneous operation of reverse faulting and of minor strike-slip and oblique normal faulting, with slip vectors aligned ~ parallel to the Pliny and Strabo Trenches and the long axis of the local bathymetry.
SHEAR WAVE ANISOTROPY MEASUREMENTS ABOVE SMALL EARTHQUAKES IN TRICHONIS LAKE, GREECE
Authors: Stavropoulou V. , Giannopoulos D. , Sokos E. , Konstantinou K.I. , Tselentis G.A.
Published: July 2017

On April 2007, an earthquake swarm occurred in the vicinity of Trichonis Lake, western Greece. The seismic activity started on April 10th, 2007 after the occurrence of three moderate size earthquakes MW 5.0-5.2. We performed shear wave splitting measurements on seismic events recorded during the first week of the seismic activity by a portable network of 8 stations that was installed in the area by the University of Patras Seismological Laboratory. We were able to take measurements from 5 stations as the seismicity was concentrated mostly at the eastern part of the lake. Two splitting parameters were measured through the data processing, the time-delays between the fast and slow shear wave components and the polarization directions of the fast components. In general, the data analysis revealed the presence of shear wave anisotropy in the study area. The average value of normalized time-delays was calculated at 6.9 ±1.1 ms/km while the fast polarization directions had an average of 130o ±14o. The mean fast polarization directions were consistent with what is expected concerning the local stress field, as it was sub-parallel to the strike of the major faults at the eastern part of the lake and almost perpendicular to the direction of extension. Therefore, the findings can be interpreted by an anisotropic volume of stress-aligned micro-cracks within the upper crust according to the extensive dilatancy anisotropy model.
ROCK MAGNETIC AND PALAEOMAGNETIC ANALYSES ON LITHIC FRAGMENTS FROM THE ARCHAEOLOGICAL SITE OF AKROTIRI, SANTORINI
Authors: Tema E.
Published: July 2017

Rock magnetic and palaeomagnetic analyses on lithic clasts collected from the pumice fall deposited inside the archaeological site of Akrotiri have been applied in order to estimate the deposition temperature of the first volcanic products of the Minoan eruption. A total of 50 lithic clasts have been collected from four different locations inside the excavation of Akrotiri. All samples have been stepwise thermally demagnetized and the obtained results have been interpreted through principal component analysis. The equilibrium temperature obtained after the deposition of the pumice fall varies from sample to sample but generally shows temperatures around 240-280oC. These temperatures are in good agreement with those estimated from lithic clasts from the Megalochori Quarry while they are higher compared with those from ceramic fragments from Akrotiri. The new temperature data presented here show that the pumice fall was still relatively hot when deposited inside the archaeological site and even if it interacted with the buildings, often causing the collapse of roofs, it still remained hot with mean temperature around 260oC.
EVIDENCE OF PRECURSORY PATTERNS IN AGGREGATED TIME SERIES
Authors: Adamaki K.A. , Roberts R.G.
Published: July 2017

We investigate temporal changes in seismic activity observed in the West Corinth Gulf and North-West Peloponnese during 2008 to 2010. Two major earthquake sequences took place in the area at that time (in 2008 and 2010). Our aim is to analyse Greek seismicity to attempt to confirm the existence or non-existence of seismic precursors prior to the strongest earthquakes. Perhaps because the area is geologically and tectonically complex, we found that it was not possible to fit the data well using a consistent Epidemic Type Aftershock Sequence (ETAS) model. Nor could we unambiguously identify foreshocks to individual mainshocks. Therefore we sought patterns in aggregated foreshock catalogues. We set a magnitude threshold (M3.5) above which all the earthquakes detected in the study area are considered as “mainshocks”, and we combined all data preceding these into a single foreshock catalogue. This reveals an increase in seismicity rate not robustly observable for individual cases. The observed effect is significantly greater than that consistent with stochastic models, including ETAS, thus indicating genuine foreshock activity with potential useful precursory power, if sufficient data is available, i.e. if the magnitude of completeness is sufficiently low.
LOCATING ASPERITIES BY MEANS OF STOCHASTIC ANALYSIS OF SEISMIC CATALOGS
Authors: Arvanitakis K. , Gounaropoulos C. , Avlonitis M.
Published: July 2017

In this study it is proposed that spatially detecting low b values in certain segment faults in conjunction to the spatial earthquake density of the corresponding areas, can be used in order to locate faults asperities. This hypothesis is tested in the area of Corinth Gulf where we have processed data from the earthquake catalog of the Aristotle University of Thessaloniki, during a significant period of 45 years, from 1970 until 2015. From the calculations of b values and earthquake density in certain regions asperity patterns have been observed: asperity located by small b values and low densities coincide with proposition of possible asperity found in literature. Based on these facts we reproduce the hypothesis of an Asperity in the south area of Corinth Gulf between the Helike and Xilokastro faults.
EARTHQUAKE FORECAST BY TIME-DEPENDENT HAZARD MODELS
Authors: Console R.
Published: July 2017

This presentation outlines methodological aspects of earthquake forecasting. The recurring debates concerning predictability of earthquakes clearly show how this problem is centred on the difficulty of systematically testing the numerous methodologies that in the years have been proposed and sustained by the supporters of prediction. This difficulty starts, sometimes, from the lack of a quantitative and rigorous definition of the concerned precursor, and other times from the lack of continuous observations, upon which statistical analyses could be based. After an introduction concerning the definition of earthquake precursors, the way how to validate forecast hypotheses and the cost associated to their operational application, I give two examples of time-dependent hazard models, for long-term and short-term earthquake forecasts respectively. Considering the long-term forecast modelling, the effect of stress change due to previous historical earthquakes on the probability of occurrence of future earthquakes on neighbouring faults is taken into account. Following a standard methodology developed a couple of decades ago, the probability of occurrence in the next 50 years for a characteristic earthquake on known seismogenic structures can be estimated by a time-dependent renewal model. Then, a physical model for the Coulomb stress change caused by previous earthquakes on these structures is applied. The influence of this stress change on the occurrence rate of characteristic earthquakes is computed taking into account the permanent perturbation (clock advance). The method so developed is applied to the computation of earthquake hazard of the main seismogenic structures recognized in the Southern Apennines region, for which both historical and paleoseismological data are available. A popular short-term time dependent hazard forecast model is the epidemic model. In this model earthquakes are regarded as the realization of a stochastic point process, and their magnitude distribution is described by the Gutenberg-Richter law with a constant b-value. The occurrence rate density is computed by the sum of two terms, one representing the independent, or spontaneous activity, and the other representing the activity induced by previous earthquakes. While the first term depends only on space, the second one is factored into three terms that respectively include the magnitude, time and location of the past earthquakes. An example of application of the epidemic model to the 2009 L’Aquila seismic series is shown.
SIMULATIONS OF SEISMIC ACTIVITY IN THE CORINTH GULF, GREECE, FAULT SYSTEM
Authors: Console R. , Carluccio R. , Papadimitriou E. , Karakostas V.
Published: July 2017

The characteristic earthquake hypothesis is not strongly supported by observational data because of the relatively short duration of historical and even paleoseismological records. For instance, for the Corinth Gulf Fault System (CGFS), historical information on strong earthquakes exist for at least two thousand years, but they can be considered complete for M > 6.0 only for the latest 300 years, and therefore only few characteristic earthquakes are reported for individual fault segments. The use of a physics-based earthquake simulator has allowed the production of catalogues lasting 100,000 years and containing more than 500,000 events of magnitudes > 4.0. Our simulation algorithm is based on several physical elements, such as an average slip rate due to tectonic loading for every single segment in the investigated fault system, the process of rupture growth and termination, and interaction between earthquake sources, including small magnitude events. The application of our simulation algorithm to the CGFS provided realistic features in time, space and magnitude behaviour of the seismicity. These features include longterm periodicity of strong earthquakes, short-term clustering of both strong and smaller events, and a realistic earthquake magnitude distribution departing from the Gutenberg-Richter distribution in the moderate and higher magnitude range.
A MAGNITUDE INDEPENDENT SPACE-TIME EARTHQUAKE CLUSTERING ALGORITHM (MISTIC)
Authors: Leptokaropoulos K.M. , Gkarlaouni C.G
Published: July 2017

This paper introduces "MISTIC", a magnitude independent program for the analysis of spatio-temporal earthquake clustering, developed on the basis of a simple clustering algorithm which is implemented in Matlab. The method is conceptually based upon the comparison of the inter-event time and the epicentral/hypocentral distance between subsequent events, with pre-defined values, without any magnitude constraints. The code identifies spatial concentrations of the seismic activity which exhibit enhanced occurrence rates, significantly higher than the average or background seismicity rates. The visualization tools provided by the program’s interface, enable the user to directly test and control the whole process. The calculations are performed fast even for relatively large catalogs. The description of the algorithm along with some examples are presented in this work. Moreover, an application in the local microseismicity catalog for Samos-Karaburun area, in eastern Aegean Sea, is also demonstrated. The identified clusters which are extracted from the analysis, exhibit special characteristics varying from a typical mainshock/ aftershock behaviour to a swarm-like activity. Further testing and improvement of the source code are scheduled in order to constitute "MISTIC" a fast and useful tool for seismic cluster analysis.
CHARACTERISTICS OF SEISMIC EXCITATIONS IN CORINTH GULF (GREECE)
Authors: Mesimeri M. , Karakostas V. , Papadimitriou E. , Tsaklidis G.
Published: July 2017

Seismic excitations occur as mainshock-aftershock sequences (MS-AS) encompassing a strong event called mainshock with the largest magnitude in the set, or as earthquake swarms (ES) when a distinctive main event is absent. In regions as the gulf of Corinth, where active deformation is manifested with frequent seismicity bursts, it is important to distinguish MS-AS from ES for providing information on the physical process of earthquake generation and contribute to the seismic hazard assessment. For this purpose, a highly accurate local earthquake catalogue was compiled and an effort was made for clusters identification after establishing certain criteria based on spatio-temporal seismicity properties. The skewness and kurtosis of moment release history were calculated considering the normalized time of every event in a cluster since the starting time of the cluster and its seismic moment. For MS-AS we found large positive values for skewness and kurtosis contrary to ES that exhibit negative to low positive values for skewness and even lower values for kurtosis.In order to verify the classification of clusters, the b-value, the spatial size and the number of events of each cluster were examined. Finally, a scaling relation between the length of the rupture zone and magnitude derived for the MS-AS sequences.
SEISMIC RISK ASSESSMENT IN THE ATTICA BASIN
Authors: Farangitakis G.P. , Brentas O.G. , Andreadakis E. , Lekkas E.
Published: July 2017

This paper aims to determine the exposure-based earthquake risk posed in the Attica Basin, Greece using a GIS based methodology. The hazard level is based on grouped geological formations according to the New Ground Anti-Earthquake Regulation of Greece and the structural setting of the area. Vulnerability is calculated using two different methodologies. The first one uses a deterministic approach by attributing population values to each building block divided by the of each municipality and the second one uses a probabilistic approach by using centroids based on a building block level and then creating their kernel density. Both of these approaches are combined with land use maps to create the final vulnerability layers. Risk is calculated in two ways, using the product and a weighted overlay of the hazard and vulnerability layers. In the Risk maps, proof of concept comes from overlaying the damages from the earthquakes of 1981 and 1999 that affected Attica Basin. Moreover, both the maps show high Risk probability in the area of the east part of the Attica Basin but without significant damages from past earthquakes. This suggests that the Kifisos Fault Zone might act as a seismic barrier depending of the location of the epicentre.
3D NUMERICAL MODELLING OF THE SEISMIC RESPONSE OF THE THESSALONIKI URBAN AREA: THE CASE OF THE 1978 VOLVI EARTHQUAKE
Authors: Smerzini C. , Pitilakis K. , Hashemi K.
Published: July 2017

This study aims at showing the numerical modelling of earthquake ground motion in the Thessaloniki urban area, using a 3D spectral element approach. The availability of detailed geotechnical/geophysical data together with the seismological information regarding the relevant fault sources allowed us to construct a large-scale 3D numerical model suitable for generating physics based ground shaking scenarios within the city of Thessaloniki up to maximum frequencies of about 2 Hz. Results of the numerical simulation of the destructive MW6.5 1978 Volvi earthquake are addressed, showing that realistic estimates can be obtained. Shaking maps in terms of ground motion parameters such as PGV are used to discuss the main seismic wave propagation effects at a wide scale.
NEAR FAULT VELOCITY PULSE ESTIMATION: THE CEPHALONIA FEB. 3, 2014 EARTHQUAKE (M6.0)
Authors: Theodoulidis N. , Grendas I.
Published: July 2017

Near fault ground motions can be significantly different than those further away from the seismic source. Within the near fault zone ground motions are drastically influenced by the rupture mechanism, the direction of rupture propagation relative to the site and possible permanent displacement related to the fault slip. During the past two decades several sophisticated theoretical or/and empirical methods have been proposed to simulate near fault motion requiring input parameters that hardly can be provided with accuracy, leading thus to extended parametric studies and uncertainties. In this paper, a simple but effective analytical model that mathematically represents near fault ground motions (Mavroeidis and Papageorgiou, 2003) is applied and tested in the case of Cephalonia, Feb. 3, 2014 earthquake (Μ6.0). Its validity and reliability are examined and an effort to distinguish source and possible site effects is attempted for the town of Lixouri (LXR1 accelerograph) where the highest damage levels was observed.
USE OF AMBIENT VIBRATIONS IN UNDERSTANDING LOCAL SITE EFFECTS AT BROADBAND SEISMIC STATIONS OF THE HELLENIC UNIFIED SEISMOLOGICAL NETWORK (HUSN)
Authors: Kementzetzidou D. , Paradisopoulou P. , Gkogkas K. , Arampatzi E. , Kyriakidou E. , Melissanidou E. , Theodoulidis N.
Published: July 2017

The evaluation of ambient seismic noise at the Hellenic Unified Seismic Network (HUSN) stations is investigated in this study. Ambient vibration recordings combined with the horizontal to vertical (H/V) spectral ratio technique helps in characterizing local site effects. This technique was applied at 17 sites ambient noise measurements. We selected a number of 1-hr waveform segments during day and night for summer and winter. For each site the H/V spectral ratio was calculated and the results were combined with geological and geophysical information. The goal was to show the network performance as far as the station quality and noise level at each site concerns in order to provide possible structural improvements, seismic station relocations or to detecting operational problems.
UNDERSTANDING THE PHYSICS OF KAPPA (Κ0): INSIGHTS FROM THE EUROSEISTEST NETWORK
Authors: Ktenidou O.J. , Abrahamson N. , Drouet S. , Cotton F.
Published: July 2017

this study we estimate the spectral decay factor κ0 for the EUROSEISTEST array. Site conditions range from soft sediments to hard rock over 14 surface and 6 downhole accelerographs. First, we separate local and regional high frequency attenuation and measure κ0. Second, we use the existing knowledge of the geological profile and material properties to correlate κ0 with different site characterisation parameters (Vs30, resonant frequency, depth-to-bedrock). Third, we use our results to improve our physical understanding of κ0. We propose a conceptual model comprising two new notions. On the one hand, we observe that κ0 stabilises for high Vs values; this may indicate the existence of regional values for hard rock κ0. If so, we propose that borehole measurements may be useful in determining them. On the other hand, we find that material damping may not suffice to account for the total measured attenuation. We propose that, apart from damping, additional site attenuation may be caused by scattering from small-scale profile variability. If this is so, then geotechnical damping measurements may not suffice to infer overall crustal attenuation under a site; but starting with a regional (borehole) value and adding damping, we might define a lower bound for site-specific κ0.
UNCERTAINTIES ON VS PROFILES AND SITE RESPONSE AT A VERTICAL STRONG MOTION ARRAY
Authors: Makra K. , Raptakis D.
Published: July 2017

Παρουσιάζουμε μια λεπτομερή μελέτη πολλών VS προσομοιωμάτων στη θέση TST του νπειραματικού πεδίου Euroseistest. Επωφελούμαστε από 62 διαθέσιμα προσομοιώματα που προέκυψαν στην ίδια θέση από μετρήσεις και μεθόδους όπως σεισμική συμβολομετρία, ανάλυση τάσεων-παραμορφώσεων και προσομοίωσης ανόπτησης σε σεισμικές καταγραφές, συμβατικές σεισμικές διασκοπήσεις (αντιστροφή επιφανειακών κυμάτων, crosshole and downhole), και σεισμικό θόρυβο σε δίκτυα. Όλα τα προσομοιώματα ομαδοποιήθηκαν σύμφωνα με τις τεχνικές ανάλυσης σε 5 μέσους όρους, Τα αποτελέσματα έδειξαν ότι διαφέρουν μεταξύ τους καθώς εξαρτώνται από τις υποθέσεις κάθε τεχνικής. Οι διαφοροποιήσεις τους σε σχέση με τον μέσο όρο τους, αν και μικρές, είναι σημαντικές στις κατακόρυφες ασυνέχειες που ορίζουν τους σχηματισμούς διαφορετικής δυστμησίας, εισάγοντας σχετική αβεβαιότητα. Αποτελέσματα της σεισμικής απόκρισης με βάση τα προσομοιώματα έδειξαν ανάλογη αβεβαιότητα με σημαντική υποεκτίμηση της ενίσχυσης, γεγονός που πρέπει να διαχειρίζεται με προσοχή στον αντισεισμικό σχεδιασμό των κατασκευών.
ON THE EARTHQUAKE OCCURRENCES IN JAPAN AND THE SURROUNDING AREA VIA SEMI MARKOV MODELING
Authors: Panorias C. , Papadopoulou A. , Tsapanos T.
Published: July 2017

In the present paper, the earthquake occurrences in the area of Japan, are studied by a semi Markov model which is considered homogeneous in time. The data applied refer to earthquakes of large magnitude (Mw>6.0) during the period 1900-2012. We consider 9 seismic zones derived from the typical 11 zones for the area of Japan, due to the lack of data for 3 zones (9-th,10-th and 11-th). Also, we define 3 groups for the magnitudes, corresponding to 6-7,7.1-8 and M> 8.0. Thus, we consider for our semi Markov model a finite state space, S={ ( ,)j i ZR | i=1,...9, j=1,2,3}, where i Z defines the i-th seismic zone and j R states the j-th magnitude scale. We applied the data to describe the interval transition probabilities for the states and the model's limiting behaviour for which is sufficient an interval of time of seven years. The time unit of the model is considered to be one day. Some interesting results, concerning the interval transition probabilities and the limiting state vector, are derived.
AN OBJECT BASED IMAGE ANALYSIS APPROACH FOR THE EXTRACTION OF THE KOLOUMBO VOLCANO AND ASSOCIATED DOMES-CONES FROM A DIGITAL SEABED ELEVATION MODEL
Authors: Βampourda D. , Argialas D. , Nomikou P. , Tzotsos A.
Published: July 2017

This paper concerns the study of the seafloor through digital seabed elevation models, using object based image analysis methods. The goal of this research was the automated extraction of geomorphological features from the seabed in regions presenting intense volcanic activity. The study area is located around the submarine volcano of the Kolοumbo (in the submarine area northeast of the Santorini island, Greece). For this purpose, a Digital Elevation Model (DEM) of the seabed with a spatial resolution of 50m was used. Derivatives of the DEM, such us Slope, Topographic Position Index (TPI) and Terrain Ruggedness Index (TRI) were created in the open source software "QGIS 2.4". The implementation of the object based image analysis approach was performed in eCognition 8.7 software. Nine segmentation and classification levels were created in order to produce the final level segmentation "level 5", where the final geomorphological features were classified. The results of the method were evaluated using classification stability measures and qualitative and quantitative comparison of the results with existing map.
Unmet goals in the treatment of Acute Myocardial Infarction: Review
Authors: Farah Alejandro , Barbagelata Alejandro
Published: July 2017

Reperfusion therapy decreases myocardium damage during an acute coronary event and consequently mortality. However, there are unmet needs in the treatment of acute myocardial infarction, consequently mortality and heart failure continue to occur in about 10% and 20% of cases, respectively. Different strategies could improve reperfusion. These strategies, like generation of warning sign recognition and being initially assisted and transferred by an emergency service, could reduce the time to reperfusion. If the first electrocardiogram is performed en route, it can be transmitted and interpreted in a timely manner by a specialist at the receiving center, bypassing community hospitals without percutaneous coronary intervention capabilities. To administer thrombolytic therapy during transport to the catheterization laboratory could reduce time to reperfusion in cases with expected prolonged transport time to a percutaneous coronary intervention center or to a center without primary percutaneous coronary intervention capabilities with additional expected delay, known as pharmaco-invasive strategy. Myocardial reperfusion is known to produce damage and cell death, which defines the reperfusion injury. Lack of resolution of ST segment is used as a marker of reperfusion failure. In patients without ST segment resolution, mortality triples. It is important to note that, until recently, reperfusion injury and no-reflow were interpreted as a single entity and we should differentiate them as different entities; whereas no-reflow is the failure to obtain tissue flow, reperfusion injury is actually the damage produced by achieving flow. Therefore, treatment of no-reflow is obtained by tissue flow, whereas in reperfusion injury the treatment objective is protection of susceptible myocardium from reperfusion injury. Numerous trials for the treatment of reperfusion injury have been unsuccessful. Newer hypotheses such as “controlled reperfusion”, in which the interventional cardiologist assumes not only the treatment of the culprit vessel but also the way to reperfuse the myocardium at risk, could reduce reperfusion injury.
Adaptation in the visual cortex: a case for probing neuronal populations with natural stimuli
Authors: Snow Michoel , Coen-Cagli Ruben , Schwartz Odelia
Published: July 2017

The perception of, and neural responses to, sensory stimuli in the present are influenced by what has been observed in the past—a phenomenon known as adaptation. We focus on adaptation in visual cortical neurons as a paradigmatic example. We review recent work that represents two shifts in the way we study adaptation, namely (i) going beyond single neurons to study adaptation in populations of neurons and (ii) going beyond simple stimuli to study adaptation to natural stimuli. We suggest that efforts in these two directions, through a closer integration of experimental and modeling approaches, will enable a more complete understanding of cortical processing in natural environments.
Monitoring of the Dynamics of the Level of Mathematics Competence Formation
Authors: Бурмистрова  , Burmistrova N.
Published: July 2017

The author studies the problem of diagnostics of modern educational results of multilevel mathematical preparation of students of economic universities. In accordance with the requirements of FGOS VO 3+ the competence format of the diagnosed quality of training is considered. As a result of multilevel mathematical preparation it is suggested to consider mathematical competence, the structure of which includes the motivational-value, cognitive, creative-activity and refl exive-evaluative components. In accordance with the proposed component composition there are determined the criteria for evaluating mathematical competence. There are selected systemic and procedural characteristics of pedagogical monitoring that provide an opportunity to determine the level of the integrated assessment of mathematical competence as a component of the graduates’ professional competence in the context of implementing the social partnership system. The results of the conducted pedagogical experiment are presented, there are carried out the analysis and interpretation, which allowed estimating the dynamics of the diagnosed phenomenon of mathematical competence as an integrative personal quality.
Development Questions of the Professional Career of the Teacher: Domestic Experience and Foreign Approaches
Authors: Чернобай  , Chernobay Elena , Шевелева  , Sheveleva N. , Дзядевич  , Dzyadevich E.
Published: July 2017

The article considers the problems of development of professional career of the teacher in Russia. The historical view on the formation of a teacher’s career is presented, the relation in diff erent periods of history in the education system is shown to the topic of professional promotion of teaching. Also, the article gives a brief overview of the development of foreign models of the teaching career (France, Germany, Scotland, etc.), new approaches to the professional development and promotion of the teacher in modern Russia are indicated.
Possibilities of the Scientometric Database eLIBRARY.RU for Independent Assessment of the Quality of the Municipal Methodological Service
Authors: Васина  , Vasina Olga , Малышева  , Malysheva Ekaterina , Григорьева  , Grigorieva Natalia
Published: July 2017

This article examines the importance of introducing an assessment of the quality of the activities of the municipal methodological service (MMC) as an organization cooperating with the pedagogical community of the municipality, and in order to improve the skills of its staff and the professionalism of the institution as a whole. Examples of the criteria are given by which the work of the methodical service can be evaluated, and also the experience of cooperation with the electronic library eLIBRARY.RU in the part of its use for forming an independent quality assessment system for MMC activity.
On Logical Characterisation of Human Concept Learning based on Terminological Systems
Authors: Badie Farshad
Published: July 2017

The central focus of this article is the epistemological assumption that knowledge could be generated based on human beings’ experiences and over their conceptions of the world. Logical characterisation of human inductive learning over their produced conceptions within terminological systems and providing a logical background for theorising over the Human Concept Learning Problem (HCLP) in terminological systems are the main contributions of this research. In order to make a linkage between ‘Logic’ and ‘Cognition’, Description Logics (DLs) will be employed to provide a logical description and analysis of actual human inductive reasoning (and learning). This research connects with the topics ‘logic & learning’, ‘cognitive modelling’, and ‘terminological knowledge representation’.