A5011462369- GNSS positioning and interference
- earthquake and tectonic studies
- Geophysics and Gravity Measurements
- Earthquake Detection and Analysis
- Ionosphere and magnetosphere dynamics
- Inertial Sensor and Navigation
- Seismology and Earthquake Studies
- High-pressure geophysics and materials
- Soil Moisture and Remote Sensing
- Advanced Computational Techniques and Applications
- Geochemistry and Geologic Mapping
- Law, logistics, and international trade
- Air Quality Monitoring and Forecasting
- Food Supply Chain Traceability
- 3D Surveying and Cultural Heritage
- Precipitation Measurement and Analysis
- Geological and Geophysical Studies Worldwide
- Remote Sensing and LiDAR Applications
- Astronomical Observations and Instrumentation
- Smart Agriculture and AI
- Maritime and Coastal Archaeology
- Seismic Waves and Analysis
- Marine and environmental studies
- Seismic Performance and Analysis
- Geophysics and Sensor Technology
Aristotle University of Thessaloniki
2016-2023
Telio (Norway)
2023
On 3 March 2021, the Mw6.3 Tyrnavos earthquake shook much of Thessalia region, leading to extensive damage in many small towns and villages activated area. The first main shock was followed next day, on 4th by an “equivalent” with Mw6.0 adjacent fault segment. These are largest earthquakes strike northeastern part since M6.3, 1941 Larissa earthquake. shocks triggered liquefaction mainly along banks Titarisios tributary where alluvial flood deposits most probably amplified ground motions. Our...
SUMMARY The Northern Thessaly Basin in central Greece ranks amongst the most well pronounced extensional (graben) basins backarc Aegean Sea region, with well-mapped faults having an ∼E–W orientation, compatible ongoing predominant ∼N–S extension. southern margin of basin is bounded by major associated strong (M6 to M7) earthquakes, whereas along its northern margin, events are more scarce, documented catalogues. Along this a weak, albeit persisting foreshock activity, culminated within 3 d,...
In this study, we show how the Global Navigation Satellite System (GNSS)-derived vertical velocities contribute to correction of tide gauge (TG) measurements used for sea level rise estimation in Greece. Twelve sites with records local heights are processed order estimate their trend. Certain error sources related TGs, e.g. equipment changes, data noise, may lead biased or erroneous estimations height. Therefore, it would be preferred follow a robust technique detect and reduce outlier...
A sequence of earthquakes occurred on March 3rd and 4th in Northern Thessaly, northern Greece, associated with previously unknown, blind normal faults within the crystalline Palaeozoic basement Pelagonian geotectonic zone. Surficial ground deformation, such as liquefaction phenomena fluvial plains, well soil fissures rock falls, have been mapped. Geological indications unmapped seismic fault, i.e., reactivated shear zones, open cracks, etc., identified bedrock. Based geological indications,...
This paper is one of a series papers dealing with the investigation Lower ionospheric variation on occasion an intense tectonic activity.In present paper, we investigate TEC variations during seismic activity in transition between Dead Sea fault and East Anatolian (SE Turkey) February 6th, 2023. The Total Electron Content (TEC) data are been provided by EUREF Network. These were analysed using Discrete Fourier Analysis order to turbulence band content. results this indicate that...
Abstract In this study, an updated crustal velocity field for the Greece area was estimated using a time series analysis that covers duration of 16 years (2001–2016) from 227 Global Navigation Satellite System (GNSS) permanent stations. The GPS processing carried out GNSS Analysis software at MIT (GAMIT) and expressed with respect to Eurasian plate. For analysis, we applied robust Median Interannual Difference Adjusted Skewness trend estimator mitigate effects discontinuities due geophysical...
Abstract. Tropospheric delay comprises one of the most important error sources in satellite navigation and is caused when radio signals broadcasted by GPS satellites propagate into atmosphere. It usually projected onto zenith direction using mapping functions named as Zenith Delay (ZTD). ZTD described sum Hydrostatic (ZHD) Wet (ZWD) with aid surface pressure temperature integrated water vapor can be estimated. The main objective this study to evaluate tropospheric performance for GNSS...
This study investigates the ionospheric total electron content (TEC) variations prior to earthquake (MW = 6.9) of 24 May 2014 in Samothraki island north Aegean Sea Greece. TEC estimates were analyzed using data from GNSS (GPS+Glonass) permanent networks with aim detect possible anomalies associate seismic event. The test period covers one week data, 4 days before and two after Selected stations are scattered around epicenter distances 16 up 1375 km. values estimated for every hour PPP...
Greece has always been an interesting study area for the geodesists due to its intense geodynamic behaviour. Especially, exploitation of a modern geodetic velocity field using GNSS becomes crucial requirement purposes. The main aim present is assessment model. This procedure based on unification various reference frames, implemented from individual extended campaigns in different epochs with effective involvement Hellenic Military Geographic Service. implementation velocities inhomogeneous...
On this study the theoretical and practical approach of an optimal geodetic referenceframe realization is described in detail. The Hellenic area due to its strong geodynamic behaviorcreates a rather inhomogeneous velocity field. This issue plays critical role stable longtermgeodetic datum. methodology Minimization Kinetic Energy Criterion(MKEC) defined analyzed on permanent GNSS network consisting 151 stations. Thesites velocities values were estimated from seven years continuously data....
The contribution of GPS networks in monitoring seismic events is important because they can provide a direct geometrical information on the Earth's crust using satellite observations In this study position displacements permanent stations are determined due to intense North Aegean area after strong earthquake May 24, 2014. horizontal coseismic for Samothrace Island were estimated at 9.4 cm and Lemnos 5.2 respectively. A period seven days was enough show that deformation evolved into two days.
Tropospheric remote sensing based on high-grade Global Navigation Satellite Systems (GNSS) is nowadays an established technique termed as GNSS-Meteorology. The GNSS signal propagation delay in the troposphere provides information to infer Integrated Water Vapor (IWV), comprising a valuable data source for Numerical Weather Prediction (NWP) models. This study aimed at investigating performance of low-cost dual-frequency receiver tropospheric monitoring. For this purpose, near real-time...
Remote sensing of the atmosphere with high-grade Global Navigation Satellite System (GNSS) is nowadays an established technique in GNSS-Meteorology. GNSS signal propagation delay troposphere provides information Water Vapor (WV), which most abundant greenhouse gas (accounting for ~70% global warming) and not well-estimated by current meteorological models. derived WV has been proved a valuable data source high-resolution limited area Numerical Weather Prediction (NWP) Nowadays, low-cost...
The assessment and interpretation of the geodetic results regarding detection possible spatial displacements deformation parameters have to be combined with a realistic geophysical model for area. Usually, this study is carried out by fitting data polynomial function, which considered sufficient describe adequately pattern. In terms computational steps needed, can accomplished simultaneously analysis observations in dynamic adjustment or non sequential approach. main goal article give short...
This is one of a series papers in which  we investigate the Lower ionospheric variation on occasion intense tectonic activity.In present paper, we TEC variations during seismic activity Thessaly, March 2021 over Europe. The Total Electron Content (TEC) data are been provided by the  Hermes GNSS Network managed GNSS_QC, AUTH Greece, HxGN/SmartNet-Greece Metrica S.A, and EUREF Network. These were analysed using Discrete Fourier Analysis order to turbulence. results this...
Abstract In this study an updated crustal velocity field for the Greece area was estimated using a time series analysis that covers duration of 16 years from 227 Global Navigation Satellite System (GNSS) permanent stations. The GNSS processing carried out Analysis software at MIT (GAMIT) and expressed with respect to Eurasian plate. For time-series analysis, we applied robust Median Interannual Difference Adjusted Skewness (MIDAS) trend estimator mitigate effects discontinuities due...
One of the principal techniques for ground-based ionospheric monitoring is based on high-grade Global Navigation Satellite System (GNSS) receivers. Recently, availability low-cost commercial GNSS modules encouraged their exploitation in frames several positioning engineering applications. The aim this study to investigate capability a receiver with performance comparable that clear advantages cost, size and power consumption. A comparative between LeicaGR30 geodetic receiver, low-cost,...
Abstract In recent years, sophisticated 3D reconstruction and measuring techniques such as Terrestrial Laser Scanning (TLS), LiDAR applications, Photogrammetry have gained popularity for surveying mapping of physical environments. Using a case study UNESCO-recognized Byzantine Bath monument, we examine the accuracy reliability different techniques. To assess dependability modern measurement systems, created models area interest using combination Scanning, technology in conjunction with...
In this paper, we investigate the Lower ionospheric variations from TEC observations during intense seismic activity of October 2020 in area Greece. The data were analysed using both, statistical analysis order to detect uneven gross and Discrete Fourier turbulence. results investigation indicate that High-Frequency limit fo turbulence content, increases as aproaching occurrence time earthquake, pointing earthquake epicenter, accordance with our previous investigations. We conclude...
The Precise Point Positioning (PPP) analysis method adapted for monitoring coordinate displacements from GNSS permanent stations data. One week period data were analyzed covering the Samothrace strong earthquake event of 6.8M. sample processed with Bernese v5.2 PPP engine and online web platform JPL which uses GIPSY/OASIS v6.3 software package. Also, validation purposes output results compared those derived by network means GAMIT processing MIT. Our experiments proved ability to measure...