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Monitoring Velocity Estimations of Permanent GPS Stations in the Eastern Mediterranean Region

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truman
17 diapositives · 311 Views · Sep 11, 2014

This study presents the velocity estimations of permanent GPS stations in the Eastern Mediterranean and Arabian regions, processed in compliance with EPN standards since 2000. The analysis covers 50 stations, integrating reference solutions with IGS/EPN coordinates and addresses outlier detection and removal for accurate time series. Key findings include comparisons with existing velocity values, insights into seasonal effects, and challenges in data continuity. The research aims to refine the modeling of tropospheric effects and prepare for future processing enhancements using ITRF2005 calibrations.

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Monitoring Velocity Estimations of Permanent GPS Stations in the Eastern Mediterranean Region
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  1. OLG Monitoring of the Eastern Mediterranean and ArabiaVelocitiy Estimations of Permanent GPS Stations Cornelia Haslinger1, Günter Stangl2 1 Space Research Institute, Austrian Academy of Sciences 2 Federal Office of Metrology and Surveying (BEV) WEGENER Nice 2006

  2. MON Mediterranean Oriental Network 50 Stations WEGENER Nice 2006

  3. Processing • Weekly results (EPN standards, Bernese Software 4.2 +5.0) since 2000, extended to Indian Ocean 2000/1 and 2006 • Reference Minimum constraint solution on BUCU, GRAZ, SOFI with IGS/EPN ITRF2000 coordinates and velocities • EPN offsets for IGS/EPN stations applied • Raw time series checked for outliers (isolated values lateral >10 mm, vertical >20 mm) • Outliers removed cleaned time series • 50 Station velocities estimated (9 too short), BSW formal sigmas 0.1 mm/year • ITRF2000 rotation of Eurasia (Altamimi, Boucher 2002) removed -> velocities relative to Eurasia • Comparison to values of EPN, MIT (Reilinger et al. 2006), SOPAC WEGENER Nice 2006

  4. MON StationLateral Velocities WEGENER Nice 2006

  5. MON StationVertical Velocities AMMN, NAMA, SOLA Probably computational artefacts or local effects WEGENER Nice 2006

  6. Time Series New IGD1/NOA1 • IGD1 (Athens) velocities similar to DION (Dionysos) • NOA1 (Athens) still too young WEGENER Nice 2006

  7. Time Series New AUT1 WEGENER Nice 2006

  8. Changing Velocity • MIT pre-earthquake velocity (1998/9) • OLG velocity after – difference 5 mm/year WEGENER Nice 2006

  9. Time Series Problems (1) • Gap by missing data - jump at restart ? WEGENER Nice 2006

  10. Time Series Problems (2) • Large up velocity, but time series ok WEGENER Nice 2006

  11. Time Series Seasonal Effects (1) WEGENER Nice 2006

  12. Time Series Seasonal Effects (2) WEGENER Nice 2006

  13. Time Series Seasonal Effects (3) WEGENER Nice 2006

  14. Time Series Seasonal Effects – Model Effect? BSW 5.0 Niell Dry+Wet Tropospheric gradients BSW 4.2 Dry Niell WEGENER Nice 2006

  15. Comparison of Velocities • OLG time series <26 weeks excluded • OLG-EPN 14 stations <5 mm/year 5 stations 5-10 mm/year (ANKR, DRAG, RAMO, TRAB, all Up bias 7 mm/year, EPN problem) • OLG-MIT 24 stations <5 mm/year 4 stations 5-10 mm/year (MALI, POL2, SEY1, OLG problem, TUBI MIT problem) • OLG-SOPAC 17 stations <5 mm/year 5 stations 5-10 mm/year (IISC, KIT3, MALI, OLG problem, NSSP SIO problem, BAHR ?), 7 stations>10 mm/year (AMMN, DGAR, MALD, POL2, SEY1, OLG problem, HALY, TEHN SIO problem) • New stations (no comparison possible) AUT1, IGD1 WEGENER Nice 2006

  16. Conclusions • Time series and 3D-velocity estimations of OLG cover a time span 2000-2006 • Permanent GPS stations in the Eastern Mediterranean monitored, most EPN corrections applied • IGS reference sites outside Europe included, but too short for reference->EPN referenced • Annual term in BSW 4.2 time series can be reduced by introducing a more refined model of the troposphere • Very good fit to GPS velocities of (Reilinger et al. 2006) • Reprocessing planned with ITRF2005 and absolute phase calibrations + improved model of the troposphere WEGENER Nice 2006

  17. Thank You ! WEGENER Nice 2006