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Prof. Maria Kouli
HELLENIC MEDITERRANEAN UNIVERSITY

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0 Image Analysis
0 Remote Sensing
0 Risk Analysis
0 geohazards
0 GIS and applications

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Journal article
Published: 07 August 2021 in Bulletin of the Geological Society of Greece
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In recent years, there is a growing interest concerning the development of a multi-parametric system for earthquakes’ short term forecast identifying those parameters whose anomalous variations can be associated to the complex process of such events. In this context, the Robust Satellite Technique (RST) has been adopted herein with the aim to detect and map thermal anomalies probably related with the strong earthquake of M6.3 occurred near the city of Larissa, Thessaly on March 3rd 2021 10:16:07 UTC. For this purpose, 10 years (2012-2021) of daily Night-time Land Surface Temperature (LST) remotely sensed data from Moderate Resolution Imaging Spectroradiometer (MODIS), were analyzed. Pixels characterized by statistically significant LST variations on a daily scale were interpreted as an indicator of variations in seismic activity. Quite intense (Signal/Noise ratio > 2.5) and rare, spatially extensive and time persistent, TIR signal transients were identified, appearing twenty five days before the Thessaly main shock (pre-seismic anomalies: February 6th, February 11th March 1st), the day of the main earthquake (co-seismic anomaly) and after the main shock (post-seismic anomalies: March 4th, 10th and 17th). The final dataset of thermal anomalies was combined with geological and structural data of the area of interest, such as active faults, composite seismogenic sources, earthquake epicenter and topography in order to perform preliminary spatial analysis.

ACS Style

Maria Kouli; Sofia Peleli; Vassilis Saltas; John P Makris; Filippos Vallianatos. Robust Satellite Techniques for mapping thermal anomalies possibly related to seismic activity of March 2021, Thessaly Earthquakes. Bulletin of the Geological Society of Greece 2021, 58, 105 -130.

AMA Style

Maria Kouli, Sofia Peleli, Vassilis Saltas, John P Makris, Filippos Vallianatos. Robust Satellite Techniques for mapping thermal anomalies possibly related to seismic activity of March 2021, Thessaly Earthquakes. Bulletin of the Geological Society of Greece. 2021; 58 ():105-130.

Chicago/Turabian Style

Maria Kouli; Sofia Peleli; Vassilis Saltas; John P Makris; Filippos Vallianatos. 2021. "Robust Satellite Techniques for mapping thermal anomalies possibly related to seismic activity of March 2021, Thessaly Earthquakes." Bulletin of the Geological Society of Greece 58, no. : 105-130.

Journal article
Published: 17 April 2021 in Sensors
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Strong motion sensor networks deployed in metropolitan areas are able to provide valuable information for civil protection Decision Support Systems (DSSs) aiming to mitigate seismic risk and earthquake social-economic impact. To this direction, such a network is installed and real-time operated in Chania (Crete Island, Greece), city located in the vicinity of the seismically active south front of the Hellenic Subduction Zone. A blend of both traditional and advanced analysis techniques and interpretation methods of strong ground motion data are presented, studying indicative cases of Chania shaking due to earthquakes in the last couple years. The orientation independent spectral acceleration as well as the spatial distribution of the strong ground motion parameters such as the Peak Ground Acceleration (PGA), Peak Ground Velocity (PGV), Peak Ground Displacement (PGD) and Arias Ιntensity observed at the urban area of Chania are presented with the use of a Geographic Information System (GIS) environment. The results point to the importance of the strong ground motion networks as they can provide valuable information on earthquake hazards prior to and after detrimental seismic events to feed rapid systems supporting civil protection decisions for prevention and emergency response.

ACS Style

Georgios Chatzopoulos; Ilias Papadopoulos; Filippos Vallianatos; John Makris; Maria Kouli. Strong Ground Motion Sensor Network for Civil Protection Rapid Decision Support Systems. Sensors 2021, 21, 2833 .

AMA Style

Georgios Chatzopoulos, Ilias Papadopoulos, Filippos Vallianatos, John Makris, Maria Kouli. Strong Ground Motion Sensor Network for Civil Protection Rapid Decision Support Systems. Sensors. 2021; 21 (8):2833.

Chicago/Turabian Style

Georgios Chatzopoulos; Ilias Papadopoulos; Filippos Vallianatos; John Makris; Maria Kouli. 2021. "Strong Ground Motion Sensor Network for Civil Protection Rapid Decision Support Systems." Sensors 21, no. 8: 2833.

Journal article
Published: 29 October 2020 in International Journal of Applied Earth Observation and Geoinformation
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Many islands of the Aegean Sea show strong geothermal activity due to volcanism in the area. In this paper, Robust Satellite Techniques (RST) are used to isolate, from other known possible sources, those thermal anomalies possibly related to geothermal activity in the Miocene volcanic field of Lesvos Island (Northern Aegean). For this purpose, 12 years (2003–2014) of daily Night-time Land Surface Temperature (LST) products, from Moderate Resolution Imaging Spectroradiometer (MODIS) acquisitions were analyzed. The final dataset contained 770 thermal anomalies whose spatial correlation with geological and structural data of Lesvos - such as caldera rims, ring faults, major tectonic lineaments and hydrothermal alterations mapped by processing SENTINEL-2 MSI satellite images – has been particularly investigated. In the approximately 20 ma geothermal field of Lesvos, geothermal activity seems to be also associated with the extensional regime of the broader area that leads to lithosphere thinning and consequent heat transfer in the multi-fractured terrain of Lesvos through volcanic and tectonic faults. Achieved results seem to confirm the possibility to use RST-based thermal anomalies to identify temporal variations in the geothermal activity probably due to the uplifting and circulation of the hydrothermal waters.

ACS Style

Sophia Peleli; Maria Kouli; Francesco Marchese; Teodosio Lacava; Filippos Vallianatos; Valerio Tramutoli. Monitoring temporal variations in the geothermal activity of Miocene Lesvos volcanic field using remote sensing techniques and MODIS – LST imagery. International Journal of Applied Earth Observation and Geoinformation 2020, 95, 102251 .

AMA Style

Sophia Peleli, Maria Kouli, Francesco Marchese, Teodosio Lacava, Filippos Vallianatos, Valerio Tramutoli. Monitoring temporal variations in the geothermal activity of Miocene Lesvos volcanic field using remote sensing techniques and MODIS – LST imagery. International Journal of Applied Earth Observation and Geoinformation. 2020; 95 ():102251.

Chicago/Turabian Style

Sophia Peleli; Maria Kouli; Francesco Marchese; Teodosio Lacava; Filippos Vallianatos; Valerio Tramutoli. 2020. "Monitoring temporal variations in the geothermal activity of Miocene Lesvos volcanic field using remote sensing techniques and MODIS – LST imagery." International Journal of Applied Earth Observation and Geoinformation 95, no. : 102251.

Journal article
Published: 28 December 2019 in Applied Sciences
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The drainage basins of Greece are analyzed in terms of hierarchy and discussed in view of Tsallis Entropy. This concept has been successfully used in a variety of complex systems, where fractality, memory and long-range interactions are dominant. The analysis indicates that the statistical distribution of drainage basins’ area in Greece, presents a hierarchical pattern that can be viewed within the frame of non-extensive statistical physics. Our work was based on the analysis of the ASTER GDEM v2 Digital Elevation Model of Greece, which offers a 30 m resolution, creating an accurate drainage basins’ database. Analyzing the drainage size (e.g., drainage basin area)-frequency distribution we discuss the connection of the observed power law exponents with the Tsallis entropic parameters, demonstrating the hierarchy observed in drainage areas for the set created for all over Greece and the subsets of drainages in the internal and external Hellenides that are the main tectonic structures in Greece. Furthermore, we discuss in terms of Tsallis entropy, the hierarchical patterns observed when the drainages are classified according to their relief or the Topographic Position Index (TPI). The deviation of distribution from power law for large drainages area is discussed.

ACS Style

Filippos Vallianatos; Maria Kouli. Evidence of Hierarchy in the Drainage Basins Size Distribution of Greece Derived from ASTER GDEM-v2 Data. Applied Sciences 2019, 10, 248 .

AMA Style

Filippos Vallianatos, Maria Kouli. Evidence of Hierarchy in the Drainage Basins Size Distribution of Greece Derived from ASTER GDEM-v2 Data. Applied Sciences. 2019; 10 (1):248.

Chicago/Turabian Style

Filippos Vallianatos; Maria Kouli. 2019. "Evidence of Hierarchy in the Drainage Basins Size Distribution of Greece Derived from ASTER GDEM-v2 Data." Applied Sciences 10, no. 1: 248.

Journal article
Published: 22 March 2018 in Geosciences
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Seawater intrusion into near-shore aquifers is one of the main environmental problems that affect Mediterranean islands. Crete is the biggest and most populated island of Greece, characterized by limited surface waters and strong dependence on groundwater sources as the primary source of natural water supply for extensive agricultural activity and human use. Freshwater demand in Crete has increased notably the last decades. The Geropotamos aquifer is located on the north-central coast of Crete and freshwater management is in a delicate balance with saltwater at coastal areas of the aquifer due to the scarce precipitation and high evaporation as well as the intense over exploitation of the groundwater resources. The geological setting of the study area is considered complex and the local tectonic regime is characterized by two sets of faults orientated NW-SE and NE-SW. Investigation of the aquifer using a survey grid of 1179 Transient ElectroMagnetic soundings (TEM) in 372 sites, has resulted in 1D models, and 2D/3D visualization of geoelectric structures, depicting the zones of salination of groundwater in the aquifer. Geological mapping, hydro-lithological data and geochemical analysis of 24 water samples (22 boreholes and 2 springs) are in agreement with results obtained from TEM soundings, supporting our interpretation that the aquifer is degraded by saline intrusion which likely occurs along fractures in a fault zone, emphasising the critical role of fracture pathways in salination problems of coastal aquifers.

ACS Style

Despina Kalisperi; Maria Kouli; Filippos Vallianatos; Pantelis Soupios; Stephen Kershaw; Nikos Lydakis-Simantiris. A Transient ElectroMagnetic (TEM) Method Survey in North-Central Coast of Crete, Greece: Evidence of Seawater Intrusion. Geosciences 2018, 8, 107 .

AMA Style

Despina Kalisperi, Maria Kouli, Filippos Vallianatos, Pantelis Soupios, Stephen Kershaw, Nikos Lydakis-Simantiris. A Transient ElectroMagnetic (TEM) Method Survey in North-Central Coast of Crete, Greece: Evidence of Seawater Intrusion. Geosciences. 2018; 8 (4):107.

Chicago/Turabian Style

Despina Kalisperi; Maria Kouli; Filippos Vallianatos; Pantelis Soupios; Stephen Kershaw; Nikos Lydakis-Simantiris. 2018. "A Transient ElectroMagnetic (TEM) Method Survey in North-Central Coast of Crete, Greece: Evidence of Seawater Intrusion." Geosciences 8, no. 4: 107.

Article
Published: 17 March 2018 in Pure and Applied Geophysics
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The essential goals of this paper are to test the transient electromagnetic (TEM) response in a fractured geological complex medium and to better understand the physics introduced by associating a roughness parameter β to the geological formation. An anomalous fractional diffusion approach is incorporated to describe the electromagnetic induction in rough multi-scaled geological structures. The multi-scaling characteristics of Geropotamos basin in Crete are revealed through the analysis of transient step-off response of an EM loop antenna. The semi-empirical parameters derived from late-time TEM measurements are correlated with the multi-scale heterogeneities of the medium. Certain interesting properties of the late-time slope γ(β) and the power law of near surface resistivity distribution, as extracted from TEM inversion for different depth, are presented. The analysis of the parameter γ(β) which scales the induced voltage in the loop in the late stage of the electromagnetic response leads to a different view of the EM geophysical data interpretation. We show that it is strongly correlated with areas of high fracture density within the geological formations of the Geropotamos area. For that reason, it is proposed as a local multi-scaling empirical index. The results of this paper suggest that anomalous diffusion could be a viable physical mechanism for the fractal transport of charge carriers, explaining observed late-time TEM responses across a variety of natural geological settings.

ACS Style

Filippos Vallianatos; Maria Kouli; Despina Kalisperi. Evidence of Hierarchy in the Complex Fractured System of Geropotamos (Crete, Greece), as Extracted from Transient Electromagnetic Responses. Pure and Applied Geophysics 2018, 175, 2895 -2904.

AMA Style

Filippos Vallianatos, Maria Kouli, Despina Kalisperi. Evidence of Hierarchy in the Complex Fractured System of Geropotamos (Crete, Greece), as Extracted from Transient Electromagnetic Responses. Pure and Applied Geophysics. 2018; 175 (8):2895-2904.

Chicago/Turabian Style

Filippos Vallianatos; Maria Kouli; Despina Kalisperi. 2018. "Evidence of Hierarchy in the Complex Fractured System of Geropotamos (Crete, Greece), as Extracted from Transient Electromagnetic Responses." Pure and Applied Geophysics 175, no. 8: 2895-2904.

Proceedings article
Published: 08 September 2014 in Near Surface Geoscience 2014 - 20th European Meeting of Environmental and Engineering Geophysics
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The geological setting of Geropotamos aquifer on the north-central coast of Crete, Greece, is considered complex, while the local tectonic regime of the study area is characterized by two sets of faults orientated NW-SE and NE-SW. Investigation of the aquifer using the Transient ElectroMagnetic method (TEM) has resulted initially in 1D models of geoelectric structures and a final 3D geoelectrical model was constructed, depicting the zones of salination of groundwater in the aquifer. Groundwater samples were analysed and the most important chemical parameters were determined to provide an independent dataset for comparison with the TEM results, while Groundwater Quality Maps were produced. TEM and geochemical data correspond and provide verification of the TEM approach. As a result, saline intrusion is likely to occur along fractures in a fault zone through bedrock, and this work emphasises the critical role of fracture pathways in salination problems of coastal aquifers.

ACS Style

D. Kalisperi; P. Soupios; S. Kershaw; M. Kouli; P. Barsukov; F. Vallianatos; N. Lydakis-Simantiris. Geophysical and Geochemical Study of Geropotamos Aquifer in the North-central Coast of Crete, Greece. Near Surface Geoscience 2014 - 20th European Meeting of Environmental and Engineering Geophysics 2014, 1 .

AMA Style

D. Kalisperi, P. Soupios, S. Kershaw, M. Kouli, P. Barsukov, F. Vallianatos, N. Lydakis-Simantiris. Geophysical and Geochemical Study of Geropotamos Aquifer in the North-central Coast of Crete, Greece. Near Surface Geoscience 2014 - 20th European Meeting of Environmental and Engineering Geophysics. 2014; ():1.

Chicago/Turabian Style

D. Kalisperi; P. Soupios; S. Kershaw; M. Kouli; P. Barsukov; F. Vallianatos; N. Lydakis-Simantiris. 2014. "Geophysical and Geochemical Study of Geropotamos Aquifer in the North-central Coast of Crete, Greece." Near Surface Geoscience 2014 - 20th European Meeting of Environmental and Engineering Geophysics , no. : 1.

Conference paper
Published: 12 August 2014 in Second International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2014)
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The Rethymnon Prefecture in the Crete Island, Greece, suffers from severe landslide phenomena due to its complicated geological structure with intensive tectonic fragmentation. This research applies the analytical hierarchy process (AHP) method for landslide susceptibility analysis in the Potamon watershed located inside the Rethymnon Prefecture. The following landslide conditioning factors were selected: geological formations, slope angle, aspect, curvature, distance to faults, distance to roads, distance to rivers, land use types and normalized difference vegetation index (NDVI) extracted from a Landsat-ETM satellite image. A landslide susceptibility map is prepared on the basis of available digital data. The landslide susceptibility map is validated through the comparison of the results with the already documented landslides occurring in the study area. The results indicate that the predicted susceptibility map is in good agreement with the past landslide occurrences, and, therefore, the map is trustworthy for future land-use planning of the study watershed.

ACS Style

Maria Kouli; Pantelis Soupios; Filippos Vallianatos. Integrated GIS and remote sensing analysis for landslide susceptibility mapping in Crete. Second International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2014) 2014, 9229, 92290D .

AMA Style

Maria Kouli, Pantelis Soupios, Filippos Vallianatos. Integrated GIS and remote sensing analysis for landslide susceptibility mapping in Crete. Second International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2014). 2014; 9229 ():92290D.

Chicago/Turabian Style

Maria Kouli; Pantelis Soupios; Filippos Vallianatos. 2014. "Integrated GIS and remote sensing analysis for landslide susceptibility mapping in Crete." Second International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2014) 9229, no. : 92290D.

Journal article
Published: 13 June 2014 in Environmental Earth Sciences
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In the current research, the weighted linear combination (WLC) and the weights of evidence (WofE) methods were applied for landslide susceptibility zonation mapping in the Chania Prefecture of Crete Island, Greece. Several thematic maps representing various landslide conditioning factors, such as geology formations, faults proximity, altitude, slope gradient, aspect, curvature, rivers proximity, precipitation, roads proximity and land use types have been generated in a GIS environment. Three landslide susceptibility maps were created, one for each method and a combined one by applying the logistic regression approach to the WLC and WofE susceptibility maps. The maps were evaluated and validated using the efficiency rate curve, the receiver-operator curve and the spatially agreed areas methods. The resulting landslide susceptibility maps have uncertainties introduced due to the subjective knowledge of experts in the case of WLC method and to the quality of the recorded landslides sample in the case of the WofE method. Nevertheless, the performance of the three approaches was found to be almost equal with all methods to produce quite satisfactory results. Besides the comparison of the applied methods, the current study contributes to the risk management of the area, providing the first landslide susceptibility maps for Chania Prefecture.

ACS Style

M. Kouli; C. Loupasakis; P. Soupios; D. Rozos; F. Vallianatos. Landslide susceptibility mapping by comparing the WLC and WofE multi-criteria methods in the West Crete Island, Greece. Environmental Earth Sciences 2014, 72, 5197 -5219.

AMA Style

M. Kouli, C. Loupasakis, P. Soupios, D. Rozos, F. Vallianatos. Landslide susceptibility mapping by comparing the WLC and WofE multi-criteria methods in the West Crete Island, Greece. Environmental Earth Sciences. 2014; 72 (12):5197-5219.

Chicago/Turabian Style

M. Kouli; C. Loupasakis; P. Soupios; D. Rozos; F. Vallianatos. 2014. "Landslide susceptibility mapping by comparing the WLC and WofE multi-criteria methods in the West Crete Island, Greece." Environmental Earth Sciences 72, no. 12: 5197-5219.

Conference paper
Published: 05 August 2013 in First International Conference on Remote Sensing and Geoinformation of Environment
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For the seismic action estimation according to Eurocode (EC8) one has to characterize site conditions and suitably estimate soil amplification and corresponding peak ground motion for the site. For this reason, as specified, one has to define a design spectrum through the ground-type/soil-category (S), and the peak ground acceleration (PGA) of the reference return period (TNCR) for the corresponding seismic zone and for structural technical requirements chosen by the designer. Ground type is defined through geophysical/geotechnical parameters, i.e. (a) the average shear wave velocity up to 30 meters depth, (b) the Standard Penetration Test blow-count, and (c) the undrained shear strength of soil. Through the “GEO-CHARACTERIZATION” THALIS-PROJECT we combine different geophysical and geotechnical methods in order to more accurately define the ground conditions in selected sites of the Hellenic Accelerometric Network (HAN) in the area of Crete Island. More specifically in the present efforts, geological information shear wave velocity and attenuation model calculated from seismic surface geophysical measurements is used. Additionally we utilize the ground acceleration recorded through HAN from intermediate depth earthquakes in the broader area of South Aegean Sea. Using the recorded ground motion data and the procedure defined in EC8, the corresponding elastic response spectrum is calculated for selected sites. The resulting information are compared with the values defined for the corresponding EC8 spectrum for the seismic zone comprising the island of Crete. As a final outcome of this work we intend to propose regional normalized elastic spectra for seismic design of structures and urban development planning and compare them with Eurocode.

ACS Style

A. Savvaidis; B. Margaris; N. Theodoulidis; V. Lekidis; Ch. Karakostas; M.-D. Mangriotis; I. Kalogeras; S. Koutrakis; A. Vafidis; M. Steiakakis; Z. Agioutantis; D. Rozos; C. Loupasakis; Th. Rondoyanni; P. Tsangaratos; U. Dikmen; N. Papadopoulos; A. Sarris; P. Soupios; E. Kokkinou; M. Kouli; F. Vallianatos. Geo-characterization according to recent advances of Eurocode (EC8). First International Conference on Remote Sensing and Geoinformation of Environment 2013, 8795, 879513 .

AMA Style

A. Savvaidis, B. Margaris, N. Theodoulidis, V. Lekidis, Ch. Karakostas, M.-D. Mangriotis, I. Kalogeras, S. Koutrakis, A. Vafidis, M. Steiakakis, Z. Agioutantis, D. Rozos, C. Loupasakis, Th. Rondoyanni, P. Tsangaratos, U. Dikmen, N. Papadopoulos, A. Sarris, P. Soupios, E. Kokkinou, M. Kouli, F. Vallianatos. Geo-characterization according to recent advances of Eurocode (EC8). First International Conference on Remote Sensing and Geoinformation of Environment. 2013; 8795 ():879513.

Chicago/Turabian Style

A. Savvaidis; B. Margaris; N. Theodoulidis; V. Lekidis; Ch. Karakostas; M.-D. Mangriotis; I. Kalogeras; S. Koutrakis; A. Vafidis; M. Steiakakis; Z. Agioutantis; D. Rozos; C. Loupasakis; Th. Rondoyanni; P. Tsangaratos; U. Dikmen; N. Papadopoulos; A. Sarris; P. Soupios; E. Kokkinou; M. Kouli; F. Vallianatos. 2013. "Geo-characterization according to recent advances of Eurocode (EC8)." First International Conference on Remote Sensing and Geoinformation of Environment 8795, no. : 879513.

Conference paper
Published: 05 August 2013 in First International Conference on Remote Sensing and Geoinformation of Environment
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ACS Style

Filippos Vallianatos; Maria Kouli. Evidence of nonextensive statistical physics behavior in the watershed distribution in active tectonic areas: examples from Greece. First International Conference on Remote Sensing and Geoinformation of Environment 2013, 879525 -879525-10.

AMA Style

Filippos Vallianatos, Maria Kouli. Evidence of nonextensive statistical physics behavior in the watershed distribution in active tectonic areas: examples from Greece. First International Conference on Remote Sensing and Geoinformation of Environment. 2013; ():879525-879525-10.

Chicago/Turabian Style

Filippos Vallianatos; Maria Kouli. 2013. "Evidence of nonextensive statistical physics behavior in the watershed distribution in active tectonic areas: examples from Greece." First International Conference on Remote Sensing and Geoinformation of Environment , no. : 879525-879525-10.

Journal article
Published: 28 April 2013 in Environmental Earth Sciences
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Effective management of groundwater resources is a well-known problem in several areas around the world. It is especially important to areas suffering from an intrinsic lack of fresh water, such as islands. Detailed study of available aquifers is of particular interest in the highly touristic Greek island of Crete. The increasing water demand makes water resources management extremely important for sustainable development. This is the case in the prefecture of Chania in Western Crete, where there has been a lack of success of many different groundwater management plans that have been produced over the years and submitted for application to water management authority. The inefficiency of the management plans is verified by the continuous water shortage reported every year which forces the public authorities to transfer water from far away sources and wells. Until today there are only geological data as well as information from the borehole logs; therefore, the current work is focused to study in detail the tectonic and hydrogeological characteristics of the Keritis watershed to make a correlation of the available geoenvironmental information with the geophysical data of the study aquifer. Transient electromagnetic soundings were conducted to obtain detailed information about: the tectonic, hydrogeological, hydrolithological, and geometrical characteristics of the aquifer under investigation. In addition, optimum areas of water well drilling were identified to minimize the uncertainty and the total cost (economical, managerial, etc.) of future groundwater surveys.

ACS Style

Asimina Kanta; Pantelis Soupios; Pavel Barsukov; Maria Kouli; Filippos Vallianatos. Aquifer characterization using shallow geophysics in the Keritis Basin of Western Crete, Greece. Environmental Earth Sciences 2013, 70, 2153 -2165.

AMA Style

Asimina Kanta, Pantelis Soupios, Pavel Barsukov, Maria Kouli, Filippos Vallianatos. Aquifer characterization using shallow geophysics in the Keritis Basin of Western Crete, Greece. Environmental Earth Sciences. 2013; 70 (5):2153-2165.

Chicago/Turabian Style

Asimina Kanta; Pantelis Soupios; Pavel Barsukov; Maria Kouli; Filippos Vallianatos. 2013. "Aquifer characterization using shallow geophysics in the Keritis Basin of Western Crete, Greece." Environmental Earth Sciences 70, no. 5: 2153-2165.

Journal article
Published: 15 February 2012 in Environmental Earth Sciences
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In Geropotamos River Basin, located on the north-central part of Crete, Greece, two main factors were believed to be affecting the geochemistry of the groundwater with high salt contents: seawater intrusion and/or Miocene evaporates. To identify the origin of the high salinity in groundwater, a hydrogeochemical and isotopic study was performed. Water samples from 22 wells and 2 springs were analyzed for physico-chemical parameters, major ions analysis, as well as stable isotopes (δ18O, δD). From the present survey, in which detailed hydrogeochemical investigation was conducted, the uncertainty of the contamination sources was decreased in the northern part of Geropotamos Basin. The results complement the scenario in which seawater and the widespread human activities are the principal sources of groundwater contamination. Moreover, the results of the stable isotopes analyses (δ18O and δD) support the same hypothesis and make seawater intrusion the most probable cause for the highest salinity waters. It is indicated that saline intrusion is likely to occur along fractures in a fault zone through otherwise low-permeability phyllite–quartzite bedrock, which demonstrates the critical role of fracture pathways in salination problems of coastal aquifers.

ACS Style

Francesco Sdao; Serena Parisi; Despina Kalisperi; Stefania Pascale; Pantelis Soupios; Nikos Lydakis-Simantiris; Maria Kouli. Geochemistry and quality of the groundwater from the karstic and coastal aquifer of Geropotamos River Basin at north-central Crete, Greece. Environmental Earth Sciences 2012, 67, 1145 -1153.

AMA Style

Francesco Sdao, Serena Parisi, Despina Kalisperi, Stefania Pascale, Pantelis Soupios, Nikos Lydakis-Simantiris, Maria Kouli. Geochemistry and quality of the groundwater from the karstic and coastal aquifer of Geropotamos River Basin at north-central Crete, Greece. Environmental Earth Sciences. 2012; 67 (4):1145-1153.

Chicago/Turabian Style

Francesco Sdao; Serena Parisi; Despina Kalisperi; Stefania Pascale; Pantelis Soupios; Nikos Lydakis-Simantiris; Maria Kouli. 2012. "Geochemistry and quality of the groundwater from the karstic and coastal aquifer of Geropotamos River Basin at north-central Crete, Greece." Environmental Earth Sciences 67, no. 4: 1145-1153.

Journal article
Published: 20 October 2009 in Environmental Earth Sciences
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Groundwater preservation comprises a major problem in water policy. The comprehension of the groundwater/hydraulic systems can provide the means to approach this problem. Generally, drilling is expensive and time-consuming. On the other hand, new techniques have been applied during the last few decades that provide useful information on the depth and quality of aquifers. Among them, transient electromagnetic method (TEM) is an appealing method that provides fast results with minimum field crew and solves several hydrogeological problems. Many portable systems for single-site measurements are commercially available. The TEM-Fast 48HPC was used for acquiring 106 soundings in the northwestern Crete in Greece for defining the hydrogeological characteristics of the study area, since there were no available data from boreholes. Detailed geological, hydrolithological and tectonic survey was applied prior to the geophysical measurements. All the data were integrated to produce a secure and reliable hydrogeological model for the study area prior to any future hydrowell. Specifically, geometrical and hydraulic data of the study area groundwater were acquired. Two unconnected aquifers were detected and their possible contamination due to saltwater intrusion was analyzed and eliminated. Moreover, a location for borehole construction and groundwater pumping based on the potential of the aquifer system was proposed. Finally, the contribution of TEM (and electrical resistivity tomography) geophysical methods in studying complex coastal aquifers is shown by this work.

ACS Style

Pantelis M. Soupios; Despina Kalisperi; Asimina Kanta; Maria Kouli; Pavel Barsukov; Filippos Vallianatos. Coastal aquifer assessment based on geological and geophysical survey, northwestern Crete, Greece. Environmental Earth Sciences 2009, 61, 63 -77.

AMA Style

Pantelis M. Soupios, Despina Kalisperi, Asimina Kanta, Maria Kouli, Pavel Barsukov, Filippos Vallianatos. Coastal aquifer assessment based on geological and geophysical survey, northwestern Crete, Greece. Environmental Earth Sciences. 2009; 61 (1):63-77.

Chicago/Turabian Style

Pantelis M. Soupios; Despina Kalisperi; Asimina Kanta; Maria Kouli; Pavel Barsukov; Filippos Vallianatos. 2009. "Coastal aquifer assessment based on geological and geophysical survey, northwestern Crete, Greece." Environmental Earth Sciences 61, no. 1: 63-77.

Journal article
Published: 08 May 2009 in Natural Hazards
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The central part of Rethymnon Prefecture, Crete Island, suffers from severe landslide phenomena because of its geological and geomorphological settings alternated by the human activities. The main landslide preparatory and triggering causal factors are considered to be the ground conditions (lithology), geomorphological processes (fluvial erosion, etc.), and the man-made actions (excavations, loading etc.). The purpose of this study is to develop a decision support and continuous monitoring system of the area by composing landslide hazard and risk maps. For that reason, several approaches of the weighted linear combination (WLC), a semi-quantitative hazard analysis method, were adopted in a Geographic Information Systems (GIS) environment. The results were validated using a pre-existing landslide database enriched with new landslide locations mapped through image interpretation of a processed IKONOS satellite image. The validation results showed that the WLC method coupled with remote sensing (RS) and GIS techniques can support engineering geological studies concerning landslide vulnerability of hazardous areas.

ACS Style

Maria Kouli; Constantinos Loupasakis; Pantelis Soupios; Filippos Vallianatos. Landslide hazard zonation in high risk areas of Rethymno Prefecture, Crete Island, Greece. Natural Hazards 2009, 52, 599 -621.

AMA Style

Maria Kouli, Constantinos Loupasakis, Pantelis Soupios, Filippos Vallianatos. Landslide hazard zonation in high risk areas of Rethymno Prefecture, Crete Island, Greece. Natural Hazards. 2009; 52 (3):599-621.

Chicago/Turabian Style

Maria Kouli; Constantinos Loupasakis; Pantelis Soupios; Filippos Vallianatos. 2009. "Landslide hazard zonation in high risk areas of Rethymno Prefecture, Crete Island, Greece." Natural Hazards 52, no. 3: 599-621.

Journal article
Published: 26 April 2008 in Environmental Earth Sciences
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Soil erosion is a growing problem in southern Greece and particularly in the island of Crete, the biggest Greek island with great agricultural activity. Soil erosion not only decreases agricultural productivity, but also reduces the water availability. In the current study, an effort to predict potential annual soil loss has been conducted. For the prediction, the Revised Universal Soil Loss Equation (RUSLE) has been adopted in a Geographical Information System framework. The RUSLE factors were calculated (in the form of raster layers) for the nine major watersheds which cover the northern part of the Chania Prefecture. The R-factor was calculated from monthly and annual precipitation data. The K-factor was estimated using soil maps available from the Soil Geographical Data Base of Europe at a scale of 1:1,000,000. The LS-factor was calculated from a 30-m digital elevation model. The C-factor was calculated using Remote Sensing techniques. The P-factor in absence of data was set to 1. The results show that an extended part of the area is undergoing severe erosion. The mean annual soil loss is predicted up to ∼200 (t/ha year−1) for some watersheds showing extended erosion and demanding the attention of local administrators.

ACS Style

Maria Kouli; Pantelis Soupios; Filippos Vallianatos. Soil erosion prediction using the Revised Universal Soil Loss Equation (RUSLE) in a GIS framework, Chania, Northwestern Crete, Greece. Environmental Earth Sciences 2008, 57, 483 -497.

AMA Style

Maria Kouli, Pantelis Soupios, Filippos Vallianatos. Soil erosion prediction using the Revised Universal Soil Loss Equation (RUSLE) in a GIS framework, Chania, Northwestern Crete, Greece. Environmental Earth Sciences. 2008; 57 (3):483-497.

Chicago/Turabian Style

Maria Kouli; Pantelis Soupios; Filippos Vallianatos. 2008. "Soil erosion prediction using the Revised Universal Soil Loss Equation (RUSLE) in a GIS framework, Chania, Northwestern Crete, Greece." Environmental Earth Sciences 57, no. 3: 483-497.

Journal article
Published: 15 May 2007 in Journal of Hydrology
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Knowledge of aquifer parameters is essential for the management of groundwater resources. Conventionally, these parameters are estimated through pumping tests carried out on water wells. Few boreholes may be available and carrying out pumping tests at a number of sites may be costly and time consuming. The application of geophysical methods in combination with pumping tests provides a cost-effective and efficient alternative to estimate aquifer parameters. A geophysical method is used to obtain aquifer characteristics that are estimated through the pumping tests. A correlation is established between these parameters at other sites where pumping has not been carried out. In this way, the entire investigation area could be covered to characterize an aquifer system. This study has been carried out in the Keritis basin in Chania, Crete – Greece, where the aquifer characteristics are required for the management of groundwater in the region.

ACS Style

Pantelis M. Soupios; Maria Kouli; Filippos Vallianatos; Antonis Vafidis; George Stavroulakis. Estimation of aquifer hydraulic parameters from surficial geophysical methods: A case study of Keritis Basin in Chania (Crete – Greece). Journal of Hydrology 2007, 338, 122 -131.

AMA Style

Pantelis M. Soupios, Maria Kouli, Filippos Vallianatos, Antonis Vafidis, George Stavroulakis. Estimation of aquifer hydraulic parameters from surficial geophysical methods: A case study of Keritis Basin in Chania (Crete – Greece). Journal of Hydrology. 2007; 338 (1-2):122-131.

Chicago/Turabian Style

Pantelis M. Soupios; Maria Kouli; Filippos Vallianatos; Antonis Vafidis; George Stavroulakis. 2007. "Estimation of aquifer hydraulic parameters from surficial geophysical methods: A case study of Keritis Basin in Chania (Crete – Greece)." Journal of Hydrology 338, no. 1-2: 122-131.

Journal article
Published: 24 February 2007 in Environmental Earth Sciences
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An integrated suite of environmental methods was used to characterize the hydrogeological, geological and tectonic regime of the largest waste disposal landfill of Crete Island, the Fodele municipal solid waste site (MSW), to determine the geometry of the landfill (depth and spatial extent of electrically conductive anomalies), to define the anisotropy caused by bedrock fabric fractures and to locate potential zones of electrically conductive contamination. A combination of geophysical methods and chemical analysis was implemented for the characterization and management of the landfill. Five different types of geophysical surveys were performed: (1) 2D electrical resistance tomography (ERT), (2) electromagnetic measurements using very low frequencies (VLF), (3) electromagnetic conductivity (EM31), (4) seismic refraction measurements (SR), and (5) ambient noise measurements (HVSR). The above geophysical methods were used with the aim of studying the subsurface properties of the landfill and to define the exact geometrical characteristics of the site under investigation.

ACS Style

Pantelis Soupios; Nikos Papapdopoulos; Ilias Papadopoulos; Maria Kouli; Filippos Vallianatos; Apostolos Sarris; Thrassyvoulos Manios. Application of integrated methods in mapping waste disposal areas. Environmental Earth Sciences 2007, 53, 661 -675.

AMA Style

Pantelis Soupios, Nikos Papapdopoulos, Ilias Papadopoulos, Maria Kouli, Filippos Vallianatos, Apostolos Sarris, Thrassyvoulos Manios. Application of integrated methods in mapping waste disposal areas. Environmental Earth Sciences. 2007; 53 (3):661-675.

Chicago/Turabian Style

Pantelis Soupios; Nikos Papapdopoulos; Ilias Papadopoulos; Maria Kouli; Filippos Vallianatos; Apostolos Sarris; Thrassyvoulos Manios. 2007. "Application of integrated methods in mapping waste disposal areas." Environmental Earth Sciences 53, no. 3: 661-675.

Journal article
Published: 18 August 2006 in Neues Jahrbuch für Mineralogie - Abhandlungen
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ACS Style

Maria Kouli; Karen St. Seymour. Plagioclase microtextures and their importance for magma chamber dynamics examples from Lesvos, Hellas and Teide, Canary Islands. Neues Jahrbuch für Mineralogie - Abhandlungen 2006, 182, 323 -336.

AMA Style

Maria Kouli, Karen St. Seymour. Plagioclase microtextures and their importance for magma chamber dynamics examples from Lesvos, Hellas and Teide, Canary Islands. Neues Jahrbuch für Mineralogie - Abhandlungen. 2006; 182 (3):323-336.

Chicago/Turabian Style

Maria Kouli; Karen St. Seymour. 2006. "Plagioclase microtextures and their importance for magma chamber dynamics examples from Lesvos, Hellas and Teide, Canary Islands." Neues Jahrbuch für Mineralogie - Abhandlungen 182, no. 3: 323-336.

Journal article
Published: 10 August 2006 in Environmental Earth Sciences
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A geophysical investigation of a landfill area was conducted as inextricable phase of a preliminary geotechnical, geological and hydrogeological study of the area under investigation. Electrical resistivity tomography (ERT), one of the most promising prospecting techniques mainly concerning its effective contribution to resolve several environmental problems, was applied for the geophysical modeling. ERT is a robust imaging method the theory and implementation of which are well documented in geophysical research literature. The survey site is located in Akrotirion Peninsula, about 7 km east of Chania city in Crete I. The geological setting comprises Trypalion limestones, marly limestones and a clayed weathered layer. Cavities are also identified at various scales which are recent tectono-karstic voids. Due to the above-mentioned geological singularity and in the light of the requirement for an environmentally safe construction of the landfill, an ERT survey was carried out. Specifically, seven geoelectrical tomographies were conducted reaching the prospecting depth of 36 m. The resulted images conduced, to overcome geotechnical problems since the spatial distribution of karstic voids was determined, to plan the future sites for waste disposal as the geological conditions were studied in detail and to reliably estimate the thickness of the already deposited wastes. The resulted images were confirmed using available borehole logs and ambient noise measurements.

ACS Style

Pantelis Soupios; Ilias Papadopoulos; Maria Kouli; Irene Georgaki; Filippos Vallianatos; Eleni Kokinou. Investigation of waste disposal areas using electrical methods: a case study from Chania, Crete, Greece. Environmental Earth Sciences 2006, 51, 1249 -1261.

AMA Style

Pantelis Soupios, Ilias Papadopoulos, Maria Kouli, Irene Georgaki, Filippos Vallianatos, Eleni Kokinou. Investigation of waste disposal areas using electrical methods: a case study from Chania, Crete, Greece. Environmental Earth Sciences. 2006; 51 (7):1249-1261.

Chicago/Turabian Style

Pantelis Soupios; Ilias Papadopoulos; Maria Kouli; Irene Georgaki; Filippos Vallianatos; Eleni Kokinou. 2006. "Investigation of waste disposal areas using electrical methods: a case study from Chania, Crete, Greece." Environmental Earth Sciences 51, no. 7: 1249-1261.