PERSON IN CHARGE:: Prof. Evangelos Lagios

lagios@geol.uoa.gr

  Dr. Evangelos Lagios, Professor

Tel. (+30 1) 7274424, 7247445, Fax: (+30 1) 7243217

E-mail: lagios@geol.uoa.gr

  Dr. Nikolaos Voulgaris, Lecturer

Tel. (+30 1) 7274431,

E-mail: voulgaris@geol.uoa.gr

  Dr. Ioannis Alexopoulos, Lecturer (407)

Tel. (+30 1) 72 74 106,

E-mail: jalexopoulos@geol.uoa.gr

  Dr. Issaak Parcharidis, Research Associate

Tel. (+30 1) 7274392

E-mail: parchar@geol.uoa.gr

  Dr. (Mrs.) Spyridoula Vassilopoulou, Research Associate

Tel. (+30 1) 7274392

E-mail: vassilopoulou@geol.uoa.gr

  Dr. Athanassios Ganas, Research Associate

Tel. (+30 1) 7274392, 3490195

E-mail: aganas@gein.noa.gr

POST-GRADUATE STUDENTS

  Mr. Ioannis Giannopoulos, Student Doctorate

Tel. (01) 7243217

E-mail: ggiann@cc.uoa.gr

  Mr. Stylianos Chailas, Doctorate Student

Tel. (01) 7243217

E-mail: schailas@cc.uoa.gr

  Mr. Pavlos Dafnis, Doctorate Student

Tel. (01) 7243217

E-mail: dafnis@geol.uoa.gr

Giannopoulos J., Lagios E. & Sigmundsonn F. (1996). Global Positioning System (GPS) Monitoring on Santorini (Thera) Volcano. Proc. 2nd Workshop on European Laboratory Volcanoes, May 2-4, Santorini, Greece (Publ. Europ. Comm. DGXII Environment and Climate Res. Progr.), 271-279.

Lagios E., Chailas S., Giannopoulos J. & Sotiropoulos P. (1998). Surveillance of Nissyros Volcano : Establishment and remeasurement of Rn & GPS networks. Proc. 8th Intern. Congress Geol. Soc. Greece, Patra, May 27-29, Vol. 32/4, 215-227.

Lagios E. (2000). Intense crustal deformation rates on Nissyros Island (Greece), deduced from GPS studies, may foreshadow a forthcoming volcanic event. Proc. 2^nd Intern. Conf. On Earthquake Hazard and Seismic Risk Reduction, Sept. 15-21,1998, Yerevan, Armenia (in press).

Lekkas, E., Lozios, S., Bertakis, G. & Vassilopoulou, S. (1995). - Management of geoenvironment problems (Natural Hazards). A method for landslide hazard assesment using Geographical Information Systems (G.I.S.). XV Congress of the Carpatho-Balkan Geological Association, Special Publications of the Geol. Soc. Greece, No 4/3, p.998-1001.

Lekkas, E., Vassilopoulou, S., Chatzinakos, I., (1998). – Engineering geological conditions – Landslide phenomena in the village of Ropoto (Trikala – Greece). 8^th Congress of the IAEG Engineering Geology – A Global view of the Pacific Rim., Editors D. P. Moore, O. Hungr. Vol. III, p. 1807 – 1812, Vancouver.

PAPADOPOULOS T.D., STAVRAKAKIS G.N., ALEXOPOULOS J., VOULGARIS N. & DRAKOPOULOS J. (1997). AUTO-SEISMO-GEOTECH. A GIS based multidisciplinary microzonation project - Part II Geophysical investigations. Proc. of European Union of Geosciences (EUG 9), 23-27 March, Strasbourg - France.

Parcharidis, Is., Psomiadis, E., Stamatis, G. (1998): Using Landsat TM images to study karstic phenomena. ITC Journal, 1998-2, 118-123.

PARCHARIDIS, Is. (1998). Morphostructure patterns in satellite multi-spectral Landsat TM images. Geologica Carpathica, 49, 5, 307-313.

PARCHARIDIS Is., POSCOLIERI M., NIKOLAKOPOULOS K. and SERELIS K., (1999). Revised geomorphic and geologic outlines of Lesvos island by a comparative analysis of TM Landsat data and classical maps. Proceedings of International Geoscience and Remote Sensing Symposium (IEEE, Hamburg 28-6/2-7/ 1999), v. II, p.876-878.

PARCHARIDIS IS., GATSIS I., PSOMIADIS EM. & STAMATIS G. (1999). Landsat TM data and information technology to potential water pollution detection in Vegoritis-Petron lakes (Greece). Proceedings of the 6^th Intern. Conference on Environmental Science and Technology (Global NEST), vol. I, p. 401-409

PARCHARIDIS, Is., GARTZOS, E. & PSOMIADIS, E., 1999. Alteration zones detection in Lesbos island, through the application of Landsat band ratio images. Mineral Wealth, 112, p. 37-46

PARCHARIDIS IS., PAVLOPOULOS A., SERELIS K. & TSINTZOURAS S. (1999). Man made impact monitoring in Messologhi lagoon system using multispectral ERS.SAR data. Proceedings of the 6^th Intern. Conference on Environmental Science and Technology (Global NEST), vol.II, p. 416-423

Vassilopoulou S. (2000). Geodynamics of the Argolis Peninsula with the G.I.S development and use of Remote Sensing Data. Phd Thesis, University of Athens, Department of Geology. p. 210

http://www.geowarn.org

Quiescent but active volcanoes in regions of high geodynamic unrest present a severe hazard and risk potential and require integrated monitoring, satellite surveying and modelling. Monitored geodetic, seismic and geochemical data together with satellite images will be transferred and unified in a coherent way to allow integration into a geo-spatial information system (GIS). An interactive and user-friendly multimedia tool will then be introduced as platform encompassing a workflow of graphical 2- to 4-D landscape models and all monitored data. Hazard and scenario modelling in space and time will be achieved within the CD-ROM/WWW-based multimedia platforms. An early-warning system and emergency plan, applicable to other volcanic areas and educational video spots will be delivered to generate public awareness. A quick reference manual serves for trouble shooting and quality assurance. The volcanic island of Nisyros (South Aegean Sea), that suffered a seismic crisis between 1996-1998 is seen as a unique example to accomplish the multi-parametric data set. The Nisyros case will then be compared with another European volcanic field, Campi Flegrei/Solfatara (Italy), which bears a high potential for volcanic reactivation and accompanied earthquakes.

Surveillance of Nisyros Volcano: Geophysical and Geodetic measurements 1999.

Council of Europe, E.C.P.F.E.

GPS and Radon networks were established on Nisyros Island, for the surveillance of its active volcano in June 1997. Repeated measurements of the GPS network can provide a picture of the crustal deformation of the area due to the probable upward magma motion or/and the breakout of an intense seismic activity.

Parallel to the measurements of the GPS network for the determination of vertical and horizontal crustal deformation of the area, a Radon network was also re-measured. The Radon level variations were therefore determined, and a correlation to the observed seismic activity is aimed, especially by using the continuous time-series radon values provided by a permanently established multi-parameter radon-measuring station in Mandrakion (Nisyros), transmitting the data to Athens via satellite in real-time.

It has been shown that no significant horizontal deformation has generally taken place in Nisyros for the last two years 1998 and 1999. The presently therefore observed deformation is the one remained in Nisyros since the end of 1997, after the earthquake crisis of 1996/97, being basically controlled by two major faulting zones of the island. The previously (1997) registered uplift at all GPS stations of the network (20-40 mm) presenting a picture of a “bulge”, seems to have been adjust to previous normal levels, with the exception of the stations at the western and northern part of the island, where their uplift character (about 20mm) still prevails.

The Radon level variation over Nisyros has not increased; on the contrary, some stations having systematically larger radon values compared to the others exhibit now half-level values than usual.

The above observations seem to be compatible with the seismicity of the area, which seems to be at a low admittedly level.

Santorini GPS Network

A GPS network for crustal deformation studies was established on Santorini Island System, during summer 1994, for the surveillance of the Santorini Volcano. The GPS network, consisting of fourteen stations on the mainland of Thera, four on Nea Kammeni and two on Therassia, was also remeasured in 1995. The results of the measurements and the accuracy of the GPS Network is basically on a few millimeters level. The remeasurements of the network indicates that there is not any deformation in the area, and a current stability of the caldera is inferred. There was a remeasurement of the network along certain long baselines during 1996. The only change observed is the one on the line Pyrgos – Nea Kammeni, indicating a difference of 21± 6mm, 10± 4mm and 15± 5mm along the X, Y and Z directions, respectively. However, there is no change observed between the line Pyrgos – Therasia during the same time period (1995 – 1996)

GPS network and InSAR

GPS network and InSAR

The Unit of Space Applications in Geosciences provides a centralized source of software and hardware facilities for the following applications, available for the community of the Geology Faculty of the University of Athens:

1. Global Positioning System (GPS)
2. SAR Interferometry
3. Satellite Image Processing

1. HARDWARE

Two (2) high-performance PLATO 700 MHz Pentium III

768 MB of memory

18 GB of disk space

20-inch high-resolution monitors

Internal CD-ROM drives and CD-Writer

Network commun. Cards etc.

Two (2) Laptop (One HP Omnibook XE II, and one TOSHIBA Satellite)

Pentium III 450

64 MB of memory

Internal CD-ROM driver

Video Camera

Network commun. Cards etc.

Two (2) Pentium II 300 MHz

64 MB of Memory

8.2 GB of disk space

17-inch high-resolution monitors

Internal CD-ROM drivers

Network commun. Cards etc.

• Epson Stylus Color 1160, A3
• Epson Stylus photo 750, A4
• HP DeskJet 815, A4
• A3 ScanMaker Microtek 9600 XL
• CD Rewritable Recorder

3. GPS Receivers

Geodetic GPS receivers of type WILD SR 299 (to be upgraded to SR 399).

2. SOFTWARE

2.1 Satellite Image Processing

• Five licenses for ERDAS Imagine; a satellite image processing and analysis software package.

2. SAR Interferometry

• A single-user license for EarthView InSAR; a software designed to produce digital elevation models and height change maps through the use of repeat pass SAR interferometry.

• A single-user license for Earth-View Advanced Precision Processor (APP); an advanced SAR Processor for a full choice of SAR processing algorithms and parameters.

2. GIS

• A single-user license for Arc View 3.2 (including Spatial and 3-D Analyst extensions).

The Unit has large and growing archives of SPOT, LANDSAT TM, LANDSAT ETM, ERS-1, ERS-2, SIR-C and IKONOS Images.

These are available for research projects and educational purposes. The data cover the whole Hellenic area and most of the adjacent regions.