A. Zanutta

University of Bologna, Bolonia, Emilia-Romagna, Italy

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Publications (30)12.79 Total impact

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    ABSTRACT: A campaign of absolute gravity (AG) measurements was conducted with both FG5 and A10 meters on Ross Island and in Terra Nova Bay in November and December 2011. It resulted from a collaboration between Danish, French, Italian, New Zealand and US agencies and institutes, under the POLENET program. For the second time in 2 years, AG was measured at McMurdo Station and Scott Base. For the fifth time in 21 years, it was measured at Mario Zucchelli Station. Moreover, AG field observations were initiated at various GPS stations of the A-NET network. We will report on the very last campaign, show the gravity trends at McMurdo Station, Scott Base and Mario Zucchelli Station, and describe how they compare to estimates of the gravity variation derived from space measurements by the GRACE twin satellites.
    04/2013;
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    ABSTRACT: The Italian geodetic infrastructure in Antarctica has been constantly developed during the last two decades. The integration of geodetic instruments with other geophysical sensors has been driving the planning and design of the geodetic infrastructure at Mario Zucchelli Station (MZS) and in a wide area around the base. Our purpose is to maximize the interdisciplinary use of the geodetic observations and to widen the field of investigation. The first geodetic GPS network was established in the area of Mt. Melbourne in the late 80s to study the local movement and deformation of the volcanic cone. A wider geodetic network was materialized on rocky outcrops in 1999-2000 with the purpose to study crustal deformations in the Northern Victoria Land (NVL). The project, named VLNDEF (Victoria Land Network for DEFormation Control), also aims at colleting measurements to constrain Glacial Isostatic Adjustment (GIA) models. VLNDEF is formed by 28 points that are accessible by means of helicopter, the maximum distance of points from the Italian base MZS being about 500 km. A permanent GPS station (TNB1) was installed in 1998 at MZS with DOMES N. 66036M001. In addition, to increase redundancy in the long term observations at MZS, an additional permanent GPS station TNB2 was installed in 2008 on a marker materialized a couple of years earlier and a few meters apart from TNB1. In addition, during 2008 three semi permanent remote stations were installed: VL01 (Cape Hallett), VL05 (Cape Philips), VL18 (Starr Nunatak). They are powered by a set of batteries and solar panels and provide a few months of data every year. Since its establishment, VLNDEF has been surveyed ten times, of which three are surveys of the whole network. GPS measurements are the core of the Italian geodetic infrastructure and are complemented by tide gauge measurements (since 2006), radiosoundings (during the Austral summer), on-ground meteorological parameters, episodic absolute and relative gravity measurements, geomagnetic field measurements and other geophysical observations. The deformation patterns obtained with GPS observations over the VLNDEF network are coupled with the data acquired during the geological and geomorphological surveys; the set of observations is used to study the neo-tectonics of NVL. We present the most recent geodetic results derived from the VLNDEF GPS data set and a recent cinematic model of the whole area. We present the preliminary geoid model in the northern part of the network.
    04/2013;
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    ABSTRACT: During the Antarctic Italian expedition carried out in 1999 a geodetic network was materialized on rocky outcrops throughout the Northern Victoria Land (NVL), Antarctica. The project, named VLNDEF (Victoria Land Network for DEFormation control), started with the goal to detect neotectonic phenomena present in the region and to supply metrical information to constrain Glacial Isostatic Adjustment (GIA) models. The project is part of GIANT (Geodetic Infrastructure in ANTarctica) framework of the SCAR (Scientific Committee on Antarctic Research), an international program since 1992, with the supervision of Antarctic Neo-TECtonics (a committee of specialists). Objectives of this work are the evaluation of absolute motions of the VLNDEF GPS sites expressed in the ITRF reference frame and the estimation of relative residual intra-plate velocities, in order to investigate the present-day kinematics of NVL region. The network is formed by 28 points that are accessible by means of helicopter, the maximum distance of points from the Italian base Mario Zucchelli Station (MZS) being about 500 km. A permanent GPS station (TNB1) was installed in 1998 at MZS with Domes #66036M001. Three semi permanent remote stations (VL01 Cape Hallett, VL05 Cape Philips, VL18 Starr Nunatak), powered by sets of batteries and solar panels, provide a few months of data acquisition every year. Nine GPS measurement campaigns were conducted during the Antarctic summers 1999/2011, three of which being complete repetitions of the network. The computation of coordinates and velocities of the VLNDEF points has been implemented taking into account the campaign style dataset of 12 years and its framing into a global network, by means of different scientific software packages: Bernese V.5.0 and Gamit-Globk. In order to homogeneously process the data set, the same up-to-date data analysis strategy, ancillary files (IGS orbits and clock model, physical bias models, etc.), datum and constraints have been adopted. The coordinates obtained from the two different software packages were compared to spot out differences and to obtain a final set of coordinates and velocities to be adopted as reference solution. The regional velocity field of NVL land is presented together with some Antarctic permanent stations long time series.
    AGU Fall Meeting Abstracts. 12/2011;
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    ABSTRACT: The concept of "Industrial Archaeology" was introduced in the 1950s in England in order to consider the branch of Archaeology that, in integration with engineering, architecture and economics, studies the industrial past, with the purpose of document, protect and exploite the industrial-cultural heritage. The systematic study of this kind of structures and artefacts need a wide range approach, that starts from the investigation about the object historic fonts until its complete qualitative and quantitative description, also considering the characteristics of the surrounding territory. This task often needs the integration of different survey techniques for data capturing and processing, in order to perform the 3D modeling and to analize the structural deformations of manufactured articles. The paper presents the surveying and monitoring activities on the important structure of the Casalecchio di Reno dyke, near Bologna. The first historic notes on the dyke are very old; they are dated back to the I millenium A. D. and report the news of a wooden barrage of the Reno canal. The construction of the actual structure is in the period 1360-1367 and suffered during the centuries numerous interventions and restores. The surveying activities on the dyke were realized in 2005-2006 and 2009 and involved different techniques (classical topography, high precision geometric levelling, range-based method by terrestrial laser scanning, digital photogrammetry, thermal imagery) integrated together in a unique local reference system, in order to study the stability and the movements of the structure in a established period of time and to realize a 3D model. Together with detail surveys on the single parts of the structure, an analysis at a larger territorial scale was performed by aerial photogrammetry, either using current imagery and historical data. The topographic measurements with traditional differential techniques have achieved a very high level precision and the realized three dimensional mesh on the dyke surface has permitted the establishment of a unique local reference system also used for all the other surveys; the 3D model from terrestrial laser scanning permits the comparison between the object current shape and some geometric information, as for example the slope, derived from historic drawings. The overall activity has been performed in the framework of an important consolidation and restoration work carried out after severe problems suffered by the structure after the 2008-2009 winter season.
    International Journal of Geophysics 04/2010; 12:15547.
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    Geografia Fisica e Dinamicca Quaternaria 01/2009; 32:117-127. · 0.61 Impact Factor
  • ION GNSS, International Technical Meeting; 01/2009
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    P. Baldi, N. Cenni, M. Fabris, A. Zanutta
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    ABSTRACT: The evolution of the Patigno landslide, a deep-seated gravitational slope deformation in the Northern Apennine range (Italy), was investigated using archival photogrammetry, and GPS observations from a permanent station located inside the landslide. Historical aerial photographs of the area taken in 1975 (scale 1:13,000), 1987 (1:13,000) and 2004 (1:30,000) were co-registered into the same reference frame using an unconventional method based on the detection of homologous points in multi-temporal models. Three DTMs were produced using a Digital Photogrammetric Workstation and compared. The displacement vectors of 293 points in the landslide were determined. The average movement velocity of the GPS station since 2004 (about 3.5 cm yr− 1) agrees with the mean displacement rate obtained from photogrammetry. Furthermore, the estimated velocity varies seasonally between 3 and 6 cm yr− 1. This variability correlated with rainfall suggests that the creep of the landslide is influenced by hydrological factors.
    Geomorphology 01/2008; 102:435-444. · 2.58 Impact Factor
  • 01/2008: chapter VLNDEF project for geodetic infrastructure definition of Northern Victoria Land, Antartica: pages 37-72; Springer Verlag - Berlin Heidelberg., ISBN: 9783540748816
  • Antonio Zanutta, Luca Vittuari, Stefano Gandolfi
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    ABSTRACT: GPS measurements were collected within the framework of the VLNDEF (Victoria Land Network for DEFormation control) project, which was started in 1999 with the aim of detecting crustal deformation in Northern Victoria Land (Antarctica). The network was established in 1999 and is composed of one permanent station (TNB1), which has been observing since 1998, and 28 periodically surveyed control points. Three complete campaigns and some partial surveying of the network have been carried out to date.Data processing and analysis have been performed using an undifferenced approach for the network position within the ITRF. A double-differences-based strategy has been applied for movement detection. The data processing and analysis of results have been carried out for all available data, both periodically acquired and long time series.GPS measurements collected between December 1999 and February 2006 indicate a mean “absolute” motion of the region of ve = 11.3 mm/yr and vn = − 11.1 mm/yr and rock uplift rates of vu = 2.8 mm/yr. These values are consistent with Antarctic plate motion and the general postglacial rebound models of the region. The relative motions within VLNDEF are small and only few points show velocities greater than the confidence levels.
    Global and Planetary Change 01/2008; · 3.71 Impact Factor
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    ABSTRACT: Scientific investigations in Antarctica are, for many different reasons, a challenging and fascinating task. Measurements, observations and field operations must be carefully planned well in advance and the capacity of successfully meeting the goals of a scientific project is often related to the capacity of forecasting and anticipating the many different potential mishaps. In order to do that, experience and logistic support are crucial. On the scientific side, the team must be aware of its tasks and be prepared to carry out observations in a hostile environment: both technology and human resources have to be suitably selected, prepared, tested and trained. On the logistic side, nations, institutions and any other organisation involved in the expeditions must ensure the proper amount of competence and practical support. The history of modern Italian Antarctic expeditions dates back to the middle 80’s when the first infrastructures of “Mario Zucchelli Station”, formerly Terra Nova Bay Station, were settled at Terra Nova Bay, Northern Victoria Land. Only a few years later, the first geodetic infrastructures were planned and built. Italian geodetic facilities and activities were, ever since, being constantly maintained and developed. Nowadays, the most remarkable geodetic infrastructures are the permanent Global Positioning System (GPS) station (TNB1) installed at Mario Zucchelli and the GPS geodetic network Victoria Land Network for DEFormation control (VLNDEF) entirely deployed on an area extending between 71° S and 76° S and 160° E and 170° E. These facilities do not only allow carrying out utmost geodetic investigations but also posses interesting capacities on the international multidisciplinary scientific scenario. In order to fully exploit their potentiality, management and maintenance of the infrastructure are crucial; nevertheless, in order to perform high quality scientific research, these abilities must be coupled with the knowledge concerning a proper use and a correct processing of the information that these infrastructures can provide. This work focuses on the different methods that can be applied to process the observations that are performed with GPS technique in Northern Victoria Land, aiming at reaching the highest accuracy of results and assuring the larger significance and versatility of the processing outcomes. Three software were used for the analysis, namely: Bernese v.5.0, Gipsy/Oasis II and Gamit/Globk. The working data sets are (i) the permanent GPS station TNB1 observations continuously performed since 1998 and (ii) the five episodic campaigns performed on the sites of VLNDEF. The two infrastructures can be regarded as neat examples of standard geodetic installation in Antarctica. Therefore, the technological solutions that were adopted and applied for establishing the GPS permanent station and the VLNDEF geodetic network as well as the data processing strategies and the data analysis procedures that were tested on their observation will be illustrated in detail. The results will be presented, compared and discussed. Furthermore, their potentials and role in geodetic research will be carefully described; their versatility will also be highlighted in the foreground of a multidisciplinary Antarctic international scientific activity. Published 37-72 1.8. Osservazioni di geofisica ambientale
    01/2008;
  • Carlo D'Agata, Antonio Zanutta
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    ABSTRACT: A quantitative analysis was performed with the aim of identifying changes in the volume and thickness of the Brenva Glacier tongue (Mont Blanc Massif, Italy) in the second half of the 20th century. This analysis was based on the comparison of digital elevation models (DEMs) derived from historical records, specifically maps (1959, 1971, 1983, 2003) and photogrammetric surveys (1991, 1997).The DEMs were generated by means of a digital photogrammetric workstation, with semi-automatic and automatic procedures. Problems relating to the identification of the control points in the photos had to be resolved in order to define the external orientation. An unconventional photogrammetric methodology, based on the identification of homologous points in zones considered outside of the glacier area, was adopted to insert the surveys into a single reference system. Furthermore, along with the photogrammetric data, DEMs derived from digitized historical maps were generated and compared to define changes in the geometry of the glacier tongue.The results indicated a positive long-term glacier tongue balance. In fact, between 1959 and 2003, there was an increase of 22.6×106 m3, equal to an average thickness of ca.+34 m (+0.7 m a−1 w.e.).Validation of the data obtained from comparison of the DEMs and the reliability of the results were discussed as well.
    Global and Planetary Change 01/2007; 56(1):57-68. · 3.71 Impact Factor
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    ABSTRACT: Since the beginning of the VLNDEF (Victoria Land Network for DEFormation control) project, started in 1999 with the aim to detect crustal deformation in Northern Victoria Land, 5 field campaigns have been carried out. Two complete surveys of the network and other partial measurement repetitions have been made. In NVL the TNB1 GPS permanent station is working since 1998, in addition to the Cape Hallett remote station installed in 2004 (supplied with an experimental wind generator). Three other remote stations (Littel Rocks, Mount Keynat, Cape Adare) will be installed during the next 2005-06 Italian expedition. Relative and absolute displacements have been estimated using a local and a regional approach, both able to detect valuable movements and, the second, to refer the network to a global reference frame (ITRF200). In particular, station coordinates in global reference frame have been obtained by processing a core network of extra-Antarctic permanent stations and by combining together regional and local solutions. A reduction in constraint effects was reached. Robust and stable solutions for horizontal and vertical displacements were obtained. Crucial is the vertical component, which is essential in order to detect different effects, such as Post Glacial Rebound in NVL. Some comparisons have been carried out with reliable models available for the NVL area.
    AGU Fall Meeting Abstracts. 12/2005;
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    G Bitelli, M Dubbini, A Zanutta
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    ABSTRACT: Photogrammetry and laser scanning, thanks to significant development in last years, are comparable surveying techniques to generate -without object contact and with a precision commensurate with scale -Digital Terrain Models (DTMs), a fundamental tool to detect, classify and monitoring landslides. The traditional way to survey the territory for landslide detection purposes is aerial or, in some cases, terrestrial photogrammetry, that permits to carry out 3D models of the terrain and, by means of DTMs comparisons, to realise multi-temporal studies. The massive introduction of modern digital photogrammetric workstations, with automatic matching procedures, allows for a rapid DTM production for landslide monitoring activities. On the other hand, the 3D reconstruction of the terrain with terrestrial laser scanning methods is another modern way to reproduce the natural surface of the ground with high accuracy and high automation. There are however some open problems concerning the elaboration of the data and the procedures to generate DTM starting from Digital Surface Models (DSMs), taking off vegetation, buildings, etc. The present work describes the terrestrial laser scanning and photogrammetric surveys realised on a small landslide body located on the Northern Apennines in Italy (municipality of Vergato, Bologna), an interesting case in order to test the laser scanning capabilities and the procedure of laser data processing, also in comparison with photogrammetry.
    07/2004;
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    ABSTRACT: The identification of the spatial and temporal evolution of landslides requires the in- tegration of geomorphological, topographical and geophysical surveys. Aerial pho- tographs flown in a long time span makes it possible to evaluate the morphological changes of the landscape, qualitatively (by photo-interpretation) and quantitatively (by photogrammetric techniques). In particular, the comparison of detailed DTMs, derived from aerial photographs and inserted in a unique reference system, may per- mit a quantitative reconstruction of landslide long-term movements. To generate high resolution DTMs, it is necessary to have a set of photogrammetric ground control points with adequate accuracy, located in an optimal way. However, in historical sur- veys, calibration certificates concerning the employed photogrammetric cameras, and ground control points are not available therefore it is not possible to calculate the ex- ternal orientation parameters of the photographs with the traditional methods. In such circumstances it turns out difficult to orient the stereoscopic models in a unique ref- erence system and approximate techniques are usually adopted (archival photogram- metric techniques). In the present research an archival photogrammetric technique has been applied to investigate a landslide located in Vergato (Bologna, Italy). Three DTMs obtained from three sets of aerial photographs, flown in 1971, 1976 and 2001, were generated through both an analytic stereoplotter and two different digital work- stations. The technique adopted to produce DTMs from historical photogrammetric models, the quantitative comparisons of the DTMs and some considerations concern- ing the main problems arisen are illustrated and discussed in the framework of setting forth a feasible procedure for monitoring landslide evolution over wide areas.
    01/2002;
  • BOLLETTINO DI GEODESIA E SCIENZE AFFINI. 01/2000; 59:281-290.
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    ABSTRACT: For the restoration of monuments it is now becoming normal practice to carry out a preliminary study of the monument before starting any kind of work. The metric survey is one of the main operations required. For this reason, photogrammetry applications already have a large bibliography. In particular, digital photogrammetry is currently an effective system, providing different solutions of both the vector and raster type. For an 18th-century gate in the Malta fortification walls, many tests were carried out in order to establish a suitable procedure for the creation of digital orthophotos. A photographic metric product, showing maximum detail without subjective interpretation of the object and the conditions of the material, could be very interesting in supporting any restoration work. The use of automatic procedures is also particularly suitable where large-scale surveys have to be carried out on very large objects with homogeneous characteristics, as is the case with the Malta fortification Walls. The advantages of digital over manual processing lie in the possibility of measuring a very large number of points without fatigue and with a high level of productivity. Digital orthophotos require a digital surface model as input, but the production of a high-fidelity reconstruction of surfaces by automatic measurement of points in close range photogrammetry still remains an open problem. Particular difficulties are caused for instance by object details that are not imaged or with strong shadows, or by complete failure of the image matching algorithms. Discontinuities in the surface, very common in architectonic objects, complicate the generation of models and surfaces. Within this work, several tests using commercial software were carried out, to define the best parameters for the automatic generation of DSM (Digital Surface Model) related to the monument being studied. The initial tests are based on the different dimension of the search window and the consequences of this choice on the accuracy and reliability of the matching procedure. Further tests are related to the number of points needed to start the matching procedure: firstly, points have been entered following a regular grid, then a greater number of points from the analytical plotting have been entered. The results are compared, also taking in account practical and economic considerations. Finally, different aspects for the creation of representative surfaces of the object have been analysed due to the non planarity of the object, presence of linear discontinuities and noticeable overhangs. The above-mentioned tests lead to several general considerations regarding strategies for creating orthophotos as a suitable qualitative and quantitative tool for the restoration of a monument.
    01/2000;
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    ABSTRACT: This paper concerns the displacement field of the central-western part of the Mediterranean basin estimated by the analysis of three repeated GPS surveys (1995, 1996 and 1997) consisting of 8 sites of a network. This network includes for the first time the stations of Algiers and Arzew, located in Northern Algeria, an area not yet investigated by regional GPS surveys. Lampedusa station is located in the Sicily Straits rifting area while the other five stations of Cagliari, Wettzell, Madrid, Matera and Noto belong to the IGS permanent tracking network. The statistical analysis of 1995, 1996 and 1997 data show significant displacements at five stations. The displacement vectors of the African sites show a convergence between the African and the Eurasian plates at a rate of 0.8 ± 0.4 cm within a two year time span. A comparison between the displacements estimated in the present work and the ITRF96 determinations for the five permanent stations allow us to evaluate the motion of Lampedusa, Algiers and Arzew in the IERS Terrestrial Reference System.
    Annals of Geophysics. 01/1999;
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    ABSTRACT: Colli Albani is a volcanic complex located in central Italy, very close to the city of Rome. Its last eruption is dated at 0.03-0.02 Ma. Now it displays a recurrent seismicity, sporadic gas emissions from soils, wells and springs, and post volcanic hydrothermal circulation. Moreover an uplift of about 30 cm over the last 43 years was recently detected by comparing the height differences between some vertices of repeated leveling surveys, thus suggesting a recent active magmatic process beneath the volcano. In 1995 a first-epoch GPS campaign was carried out with last generation receivers, the repetition campaign was performed in 1996. Data coming from the two repeated surveys were carefully processed and analyzed. A statistical analysis rigorously applied between the 1995 and 1996 adjusted coordinates shows significant coordinate differences. Some sites of the network, in particular, the sites of Vivaro (VVR), Cava di Ciampino (CVA) and Istituto Nazionale di Geofisica (INGR) display a significant subsidence of 2.6 ± 0.7, 2.7 ± 0.8 and 2.0 ± 0.8 cm, respectively, with a confidence interval at 95 percent level. This subsidence seems to be induced by a water table level lowering in Vivaro, while in the area where the sites of Cava di Ciampino and INGR are located, this motion is also confirmed by historical levelling data that show a subsidence of ~ 2 cm/yr during the last 45 years and could be due to local tectonics. Moreover, significant planimetric deformations are exhibited by the site of Castel Romano (CSR). It is remarkable that the stations of CVA, INGR and CSR are located in the area that was struck by the June 12, 1995, Md = 3.8 earthquake, although the displacement vectors are quite small. The motion of the Capranica Prenestina (CPR) station, which shows an uplift of 2.7 ± 0.7 cm, must be considered separately, being located outside the volcanic structure and placed over the carbonatic outcrops of the Prenestini Mts. Furthermore, the accuracy obtained in height determinations does not allow us to confirm if the central part of the GPS network corresponding to the area investigated by Amato and Chiarabba is uplifting within the analyzed time span.
    Journal of Volcanology and Geothermal Research 01/1998; · 2.19 Impact Factor
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    ABSTRACT: A network of nine permanent GPS stations, six of them located in Italy (Cagliari, Matera, Medicina, Noto, Padova and Torino), the other three in Central Europe (Graz, Zimmervald and Wettzell) was been analyzed four times from October 1996 till 1998. After the GPS data processing, a rigorous statistical analysis based on the F (Fisher) test applied on the detected coordinate differences showed significant displacement at Matera, Medicina and Noto. The mean velocities computed for these sites with respect to Wettzell are (0.6 ± 0.3) cm/yr for Matera, (0.7 ± 2) cm/yr for Medicina and (0.6 ± 0.3) cm/yr for Noto.GPS velocities agree with those derived by VLBI and ITRF96 solutions, provided error ellipses are taken into account. The deformation analysis of the last time span shows a suspicious horizontal jump at Padova of (1.0 ± 0.1) cm corresponding to an antenna changing within the same period. This fact shows, in spite of the care used in permanent GPS installation, how the results of the deformation analysis may be strongly conditioned by site problems.
    01/1998;
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    ABSTRACT: Geodetic and seismic evidence of crustal deformations in the Ionian area are shown in this paper. The Ionian GPS network, composed of nine sites crossing the Ionian Sea from Calabria, Southern Italy, to Northwestern Greece, was established and surveyed in 1991, 1994, 1995 within the framework of the TYRGEONET project (Anzidei et al., 1996). In 1996 a return campaign was carried out after the occurrence of seismic activity in 1995. The displacement pattern obtained for the Greek side of the network agrees well with those previously displayed, both in magnitude and direction, confirming a mean displacement rate of about 1-2 cm1/yr. The same agreement is not found for the Italian side of the network, where no significant deformations were detected between 1994 and 1996. Seismic deformation was also studied for the same area, starting from the moment tensors of events which occurred in the last 20 years with magnitude greater than 5.0; evident similarity with the displacement field exhibited by the Greek side of the Ionian Sea by geodetic surveys was inferred. On the contrary, the motion detected for the Italian area cannot be simply related to seismic activity.
    Annals of Geophysics. 01/1997;