VLNDEF PROJECT FOR CRUSTAL DEFORMATION CONTROL IN NORTH VICTORIA LAND

A. Capra1, S. Gandolfi2, F. Mancini2,

P. Sarti3, L. Vittuari2

1Politecnico di Bari, Facoltà di Ingegneria, Taranto, Italy - Viale del Turismo, 8 - Zip Code 741002DISTART, Università di Bologna, Viale Risorgimento 2, 40136 Bologna - Italy3Istituto di Radioastronomia, CNR, Centro di Geodesia Spaziale – ASI – Zip Code 75100 Matera, Italy

2

Italian Geodetic Activities in Antarctica Before 2000:

Local geodetic reference frame establishment; GPS control network (area of Terra Nova Bay); Mt. Melbourne volcano monitoring; GPS Permanent Station (TNB1).

Today: Victoria Land Network for crustal DEFormation

Control (VLNDEF); Data Integration

Between Regional Networks Between the existing Network

3

Italian Geodetic Activities in Antarctica:Strategies

Connection to regional and continental network: TAMDEF (USA), SCAR GPS Epoch;

Absolute Reference Determination: IGS; ITRF;

Comparison between different processing strategies: Bernese; Gipsy Oasis II; Pages.

4

VLNDEF Project 1999-2000 expedition: 20 station

established and 19 surveyed

2000-2001 expedition: 5 station established and 10 surveyed

Data processing and results

2002-2003 (planned) complete network survey

Deformation (if present)

5

VLNDEF: the network

6

Stations position planning Stations distribution based on;

tectonics map that shows principal and secondary fault systems

Landsat Imagery USGS 1:250000 maps Geometry

7

VLNDEF:documentation

8

Processing strategies: Bernese v4.2

Based on the baseline determination;

Measurements as long as possible (Long Time Series)

9

Processing strategies: Bernese v4.2

IGS97 and IGS00 precise orbit files;

Minor constrains on TNB1 station;

Precise a-priori coordinates file

QIF (Quasi-Iono-Free) baseline solutions

Site-specific troposphere parameters estimation

Stacking of Normal Equation

10

Processing strategies: Gipsy Oasis II

JPL precise orbit files;

Zero constrains (no fixed stations);

Precise Point Position (PPP) strategy

Tropospheric modelling

Stocastic zenith tropospheric delay

11

ITRF translation Solutions defined in ITRF (and epoch);

Solutions into a single ITRF if compared, by;

1) 3D rototraslation

2) Rates to the reference epoch

12

VLNDEF Solutions: Bernese v4.2

ITRF1997epoch vertex x y z

1997.0 TNB -1623858.473 462478.192 -6130048.9421997.0 V01 -1898355.117 344131.652 -6059589.5691997.0 V02 -1871176.725 419007.181 -6064822.1821997.0 V03 -1793824.680 550947.715 -6077986.2571997.0 V05 -1833378.687 336084.904 -6079754.0131997.0 V07 -1731871.067 451786.848 -6103456.3301997.0 V08 -1717947.958 501076.677 -6104184.8241997.0 V09 -1747656.723 562141.161 -6090108.2111997.0 V10 -1716963.190 532520.483 -6101777.7651997.0 V11 -1644838.403 517300.818 -6122510.9961997.0 V12 -1870330.418 545966.425 -6054921.0361997.0 V13 -1592717.359 511213.323 -6135756.4921997.0 V14 -1791154.858 449717.709 -6086636.2901997.0 V20 -1909089.567 677740.128 -6029108.8281997.0 V21 -1932100.150 563780.288 -6033962.3761997.0 V22 -1938968.369 628496.577 -6023703.1451997.0 V27 -1999402.141 432212.600 -6022817.4121997.0 V29 -1985915.215 573344.627 -6015394.1441997.0 V30 -2027440.436 638271.640 -5994964.1951997.0 V32 -1947613.448 479657.154 -6036111.4141997.0 120 -1641513.253 426813.979 -6128248.484

Coordinate Jan 2000 Bernese

1999-2000 expedition

ITRF1997epoch vertex x y z

1997.0 TNB -1623858.473 462478.194 -6130048.9421997.0 V04 -1786676.428 323127.170 -6095659.5651997.0 V07 -1731871.074 451786.854 -6103456.3541997.0 V08 -1717947.972 501076.685 -6104184.8211997.0 V11 -1644838.403 517300.824 -6122511.0011997.0 V13 -1592717.361 511213.326 -6135756.4921997.0 V14 -1791154.863 449717.711 -6086636.2761997.0 V15 -1596324.042 466324.090 -6136835.4421997.0 V16 -1555858.228 489202.648 -6145734.2991997.0 V17 -1561179.304 521189.756 -6142165.9991997.0 V18 -1487512.575 466337.534 -6164019.8891997.0 V19 -1490548.084 490597.396 -6162195.9811997.0 VHG -1535854.285 493058.144 -6150273.9071997.0 4 -1624492.963 462197.595 -6129770.6221997.0 600 -1665381.761 455889.132 -6122163.318

Coordinate Dec 2000 Bernese

1999-2000 expedition

On common points <5 mm differences

13

Bernese v4.2 vs Gipsy Oasis II

Bernese shows a good accuracy and high repeatability on time series;

Gipsy shows a good accuracy but low repeatability on time series;

Double difference (baseline based) strategy is the most suitable for Antarctic environment.

14

VLNDEF & TAMDEF* (USA) VLNDEF and TAMDEF have run at the

same time since the beginning;

The data is being combined to give a better picture of the crustal environment in Victoria Land (in progress);

TAMDEF is planned to be extended farther south in 2003.

*The TransAntarctic Mountains DEFormation project

15

TAMDEF

Courtesy of Mike Willis (BPRC-Ohio State University)

http://www-bprc.mps.ohio-state.edu

16

TAMDEF

Courtesy of Mike Willis (BPRC-Ohio State University)

17

TAMDEF

TAMDEFSouth

GPS along VL

VLNDEF

18

VLNDEF: the future Local deformation control constraining TNB1; Antarctic plate motions using extra-plate

stations

19

Conclusions No deformations clearly observed in the last

decade in the area of Terra Nova Bay; Repetition of measurements for Mt.Melbourne

deformation control; “zero” measurements on the VLNDEF; Integration with TAMDEF;

Local constraints Extra-plate constraints

Tectonics info; ITRF in Antarctica? International agreements for standardization of

processing procedures and data exchange.

References Al Bayari O., Capra A.,Radicioni F., Vittuari L. “GPS network for the deformation control in the Mount Melbourne area (Antarctica) : preliminary results of third measurements campaign”. Reports on Surveying and geodesy, editor M.Unguendoli, Pubblicazione del DISTART, Università di Bologna, pp.64-72, Edizioni Nautilus, Bologna, 1996.

Capra A., Gubellini A., Radicioni F., Vittuari L. “Italian Geodetic activities in Antarctica”. In “Italian Geophysical Observatories in Antarctica”, edito da A.Meloni e A.Morelli, Editrice Compositori, Bologna,1996

Capra A., Radicioni F., Vittuari L. Italian Geodetic network as reference frame for geodynamics purposes (Terra Nova Bay- Victoria Land-Antarctica). IAG Symposia, vol.119, Geodesy on the move- Gravity, Geoid, Geodynamics and Antarctica, edited by R.Forsberg, M.Feissel and R.Dietrich, IAG Scientific Assembly, Rio De janeiro, September 1997, Brazil, pp.498-503, Springer 1998

Armadillo E., Bonaccorso A., Caneva G., Capra A., Falzone P.,Ferraccioli F., Mancini F., Privitera

E., VGeophysical features of the Mt. Melbourne area and first results from the integrated network for monitoring the volcano (Antarctica).Proceedings of VII ISAES (International Symposium on Antarctic Earth Sciences), Wellington, July 1999, 2000.

[7 Capra A., Gandolfi S., Mancini F.,Sarti P., Vittuari L. VLNDEF project: geodetic contribution to geodynamics study of Victoria land, Antarctica. Proceedings of Gravity, Geoid and Geodynamics GG2000 IAG symposium, Banff, Alberta, Canada, July 2000 ,pp. 379-385, 2001

Capra A., Gandolfi S.,Mancini F., Negusini M. , Sarti P., Vittuari L. Terra Nova Bay GPS Permanent station. On press on Terra Antarctica