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VLNDEF Network for Deformation Control and as a Contribution to the Reference Frame Definition
A. Capra(2), F. Mancini(1), M. Negusini(3), G. Bitelli(1), S.
Gandolfi(1), P.
Sarti(3), L. Vittuari(1), A. Zanutta(1)
(1) DISTART – University of Bologna, Bologna, Italy;
(2) DAU – Polytechnic
of Bari, Taranto, Italy;
(3) CNR - Istituto di Radioastronomia, Matera , Italy
E-mail: alessandro.capra@mail.ing.unibo.it
VLNDEF (Victoria Land Network for DEFormationn control) Geodetic Program is within the activity of GIANT (Geodetic Infrastructure of Antarctica) SCAR (Scientific Committee on Antarctic Research) Program. Moreover the geodetic activities are established within the actions of ANTEC (ANTarctic NeoTECtonics) SCAR (Scientific Committee on Antarctic Research) Group of Specialists.
During 1999-2000 and 2000-2001 Italian expeditions was established and completely surveyed a network of 27 stations, over an area of 700 km northward and 300 km westward. The average distance between vertexes is in a range of 70-80 km and covering the area from TNB (Terra Nova Bay Italian base) to the Oates Coast [1,2].
In 2002-03 campaign the repetition of the whole network has been made.
Due to the long connections involved, session duration of about 48 hours was initially planned; this duration was recently increased and session duration in 2002-03 campaign was around 7 days; in agreement with Scientific International Community guidelines and thanks to the increased storage capabilities, time series of about 20-50 days were also collected on selected vertexes.
In the area the TNB1 GPS permanent station is operating since the 1998 when it was installed in proximity of the Italian summer station at Terra Nova Bay [3]. Data collected during the survey operations over the VLNDEF points have been fully processed in the attempt to constrain solutions within a specific reference frame. A subset of TNB1 data have also been requested by the scientific community in the frame of the SCAR GPS epoch campaign and in the realisation of the new International Terrestrial Reference Frame year 2000. Basically the TNB1 data processing is performed by means of the scientific Bernese GPS software Version 4.2. TNB1 Data are routinely processed in addition to 7 Antarctic IGS (International GPS Service for Geodynamics) permanent stations in order to strength the results within a specific ITRF. Results, integration with data from provided by other peri-antarctic GPS permanent stations and an attempt in the evaluation of the regional displacement are here presented.
Preliminary results of VLNDEF surveying repetition and deformation analysis are presented.
References:
[1] Capra A., Gandolfi S., Mancini F., Sarti P., Vittuari L. -VLNDEF project: geodetic contribution to geodynamics study of Victoria land, Antarctica. 2001. Proceedings of Gravity, Geoid and Geodynamics GG2000 IAG symposium, Banff, Alberta, Canada, July 2000, 379-385.
[2] Capra A., Gandolfi S., Mancini F.,Sarti P., Vittuari L . -VLNDEF project for crustal deformation control of Northern Victoria Land. 2002. AGS ’01 (Antarctic Geodesy Symposium), St.Petersburg, July 2001, SCAR Report, 21, 8-10.
[3] Capra A., Gandolfi S. Italian GPS permanent station in Antarctica (Terra Nova Bay- Victoria Land). Proceedings of the workshop on the «Italian GPS permanent network». F.Vespe& M.Fermi Eds., Matera, 10-11/4/97. ASI, Marzo 1999
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