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OLG Monitoring of the Eastern Mediterranean and Arabia Velocitiy Estimations of Permanent GPS Stations. Cornelia Haslinger 1 , Günter Stangl 2. 1 Space Research Institute, Austrian Academy of Sciences 2 Federal Office of Metrology and Surveying (BEV). MON Mediterranean Oriental Network.

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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

mon mediterranean oriental network
MON Mediterranean Oriental Network

50 Stations

WEGENER Nice 2006

processing
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

mon station vertical velocities
MON StationVertical Velocities

AMMN, NAMA, SOLA

Probably computational artefacts or local effects

WEGENER Nice 2006

time series new igd1 noa1
Time Series New IGD1/NOA1
  • IGD1 (Athens) velocities similar to DION (Dionysos)
  • NOA1 (Athens) still too young

WEGENER Nice 2006

time series new aut1
Time Series New AUT1

WEGENER Nice 2006

changing velocity
Changing Velocity
  • MIT pre-earthquake velocity (1998/9)
  • OLG velocity after – difference 5 mm/year

WEGENER Nice 2006

time series problems 1
Time Series Problems (1)
  • Gap by missing data - jump at restart ?

WEGENER Nice 2006

time series problems 2
Time Series Problems (2)
  • Large up velocity, but time series ok

WEGENER Nice 2006

time series seasonal effects model effect
Time Series Seasonal Effects – Model Effect?

BSW 5.0 Niell Dry+Wet

Tropospheric gradients

BSW 4.2 Dry Niell

WEGENER Nice 2006

comparison of velocities
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

conclusions
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

thank you

Thank You !

WEGENER Nice 2006

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