WEGENER Nice 2006 OLG Monitoring of the Eastern Mediterranean and Arabia Velocitiy Estimations of...
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![Page 1: WEGENER Nice 2006 OLG Monitoring of the Eastern Mediterranean and Arabia Velocitiy Estimations of Permanent GPS Stations 1Space Research Institute, Austrian.](https://reader035.fdocuments.in/reader035/viewer/2022062717/56649e455503460f94b3978f/html5/thumbnails/1.jpg)
WEGENER Nice 2006
OLG Monitoring of the Eastern Mediterranean and Arabia
Velocitiy Estimations of Permanent GPS Stations
1 Space Research Institute, Austrian Academy of Sciences2 Federal Office of Metrology and Surveying (BEV)
Cornelia Haslinger1, Günter Stangl2
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WEGENER Nice 2006
MON Mediterranean Oriental Network
50 Stations
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WEGENER Nice 2006
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
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WEGENER Nice 2006
MON StationLateral Velocities
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WEGENER Nice 2006
MON StationVertical Velocities
AMMN, NAMA, SOLA
Probably computational artefacts or local effects
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WEGENER Nice 2006
Time Series New IGD1/NOA1
• IGD1 (Athens) velocities similar to DION (Dionysos) • NOA1 (Athens) still too young
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WEGENER Nice 2006
Time Series New AUT1
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WEGENER Nice 2006
Changing Velocity
• MIT pre-earthquake velocity (1998/9)• OLG velocity after – difference 5 mm/year
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WEGENER Nice 2006
Time Series Problems (1)
• Gap by missing data - jump at restart ?
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WEGENER Nice 2006
Time Series Problems (2)
• Large up velocity, but time series ok
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WEGENER Nice 2006
Time Series Seasonal Effects (1)
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WEGENER Nice 2006
Time Series Seasonal Effects (2)
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WEGENER Nice 2006
Time Series Seasonal Effects (3)
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WEGENER Nice 2006
Time Series Seasonal Effects – Model Effect?
BSW 5.0 Niell Dry+Wet
Tropospheric gradientsBSW 4.2 Dry Niell
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WEGENER Nice 2006
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
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WEGENER Nice 2006
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
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WEGENER Nice 2006
Thank You !