During the last twenty-three years I have been engaged in a variety of research activities. My principal interest is active tectonics, but the necessity to use a series of interdisciplinary tools and technologies to advance scientific knowledge, has driven my interests in many neighboring topics. I list below the main topics I can deliver international standards research (incl. reviews), always leading or being part of a team of qualified experts.
1. Crustal deformation due to earthquakes and tectonic strain. I am particularly interested in the quantification of the deformation and the comparative use of strain metrics (dilatation, second invariant etc) in understanding magnitude/patterns of strain. I use GPS observations and InSAR maps to quantify strain rates in Greece.
2. Tectonic Geomorphology and in particular the relation of erosional platforms (such as triangular facets) to fault slip rates. I use a combination of field geology, space geodesy and digital morphometry on global DEMs (ASTER, SRTM).
3. Seismology with emphasis on relocation of earthquake sequences for fault mapping, paleoseismology for estimating recurrence intervals along strike of active faults, use of software such as Z-map to map b-value distributions across the earthquake cycle (inter-, co-, post seismic) to map stress levels, seismotectonics, Coulomb stress distribution following large earthquakes and its relation to seismicity levels.
4. Operation of early warning systems for earthquakes, volcanic eruptions and tsunamis based on GNSS technology. I have developed a prototype of an early warning platform at NOA based on GNSS. The platform uses state-of-the-art software to process GNSS signals from dual-frequency geodetic receivers along the Hellenic Arc.
5. Operation of GPS networks to map crustal deformation (including subsidence) using static observations from both permanent and campaign stations. I also make use of RTK GNSS observations in tectonic geomorphology and fault mapping.
6. Microzonation studies to map active faults and/or subsiding areas so as to contribute to safe urban planning and construction of important buildings, objects (bridges etc). I use a combination of field geology, seismology, applied geophysics and space geodesy.
7. Ground subsidence due to groundwater extraction, oil/gas exploitation. I also use a combination of field geology, remote sensing, seismology, applied geophysics and space geodesy.
8. Mineral exploration using satellite and airborne data from multispectral (and hyperspectral) sensors. I use image processing software to map clay minerals and pathfinder minerals in regions with well-exposed volcanic alterations.