Post on 27-Jun-2020
transcript
Deformation of the margin of Sudety Mountains (Southern Poland) studied by Persistent Scatterers Interferometry
GEO-IN-SAR project – preliminary results
Zbigniew PerskiRamon Hanssen, Petar Marinkovic
4T12E04329 C1P.3915
Delft University of Technology, DEOS
University of Silesia, Faculty of Earth Sciences, Dept. Of Fundamental Geology
Agenda
• GEO-IN-SAR project objectives• Methods applied• PSInSAR results of Lower Silesia area• Geology and neotectonic activity within the area• Interpretation of PSInSAR results• Future work and conclusions
GEO-IN –SAR project
Research areas
TITLE: Application of SAR interferometric(InSAR) methods for the study of natural earth surface displacements in Poland
Funded by:•Polish Ministry of Scientific Research
(project 4T12E04329)•ESA CAT-1 project (C1P.3915)
The scope of the project: to use the newest developments in a field of SAR interferometry to measure recently occurring natural earth surface movements in Poland and near-border areas.
SAMBIA AND WARMIA AREA:the strongest perceptible natural earthquake in Poland occurs inSeptember 2004. Two shocks of M ~5.0,seismoactive zones, post-glacial rebound
LOWER SILESIA AREA:Complex geological structure, recently active faults
PODHALE AREA:Young alpine tectonics, geothermal springs, earthquakes
Methods applied• Persistent Scatteres SAR Interferometry – TUDelft implementation• Interferometric processing using DORIS software• Stacks of ERS-1/2 images acquired until end of December 2000 (to avoid
high doppler data)• Correction of topography with DTED Level 2 (not yet performed in all
causes)• Coregistration with optimization of window distribution based on amplitude
and optimization of the computation of coregistration polynomial• (G. Ketelaar & P. Mainkovic)
For details: see presentations of TUDelft group
„Lower Silesia” – processed crops
Paczków tectonic graben: recently active faults, geodynamical study (Cacoń et al 2003)
City of Wrocław: general data quality check
More crops are planned
Sudetic MarginalFault
Relative LOS displacements
mm/year
PSInSARdata of Wrocław city
Valuable signal?
Processing artifacts?
Trend?
Paczków tectonic graben
NYSA
OTMUCHÓW
Relative „uplift”?? ~ 4 mm/yr?
Water reservoirs in Paczków grabenHistorical levelingcampaigns: totalsubsidence of 93 mm (~6mm/yr ? 1965-1980?)
(Cacoń 2001)
Study area: Lower Silesia• The geological structure of the area is complex• Active faults are present: Sudety Marginal Fault and secondary-order
faults forming Paczków Graben. • Precise leveling measurements carried out since 80-s by Institute of
Geodesy and Geoinformatics, Wroclaw University of Environmental and Life Sciences.
Fault pattern and tectonic units of SW Poland(Badura et al. 2004)
Lower Silesia: recent vertical earth crust movements
Velocity [mm/yr]
Wyrzykowski 1985 Kowalczyk 2006
(Cacoń 2001)
Terrain topography - SRTM
Fractured clasts in thepleistocene river gravels(Badura et al. 2007)
Terrain topography + fault patternand tectonic units
(Badura et al. 2004)
Terrain topography - SRTM
Faults reactivatedduring Quaternary
Faults active inTertiary
Terrain topography + sub-Cainozoicsurface
(Badura et al. 2004)
Terrain topography + sub-Cainozoicsurface
(Badura et al. 2004)
Water reservoirs in Paczków graben
(Cacoń 2001)
Faults of different origins and age,Only few proved to be active in Quaternary
PSI processing
• 67 ERS-1/2 scenes• Master scene:
ERS-2 15.08.1996• 65 interferograms• „Blind” PS processing• Linear model applied• Topographic correction
not yet performed• Results confirmed by
independent processing of different crop over the same area
LOS Displacementsmm/year
PSInSAR results of Wrocław city
WROCŁAW: vertical movements of benchmarks between 1968 and 1998
(Grzempowski & Cacoń, 2003)
Linear velocityover 30 years:
1.3 – 2 mm/yr
Interpretation
The main cause of ground surface movements in the Wroclaw area – groundwater withdrawal for industrial purposes. In some areas the water level table was decreased of 44 m (Grzempowski, Cacoń 2005)
• Since 1990’s significant decrease of industrial groundwater use
• Crop needs to be extended
Paczków tectonic graben
NYSA
OTMUCHÓW
Nysa re
servoi
r
Otmuchów reservoir
NYSA
OTMUCHÓW
Paczków grabenPSI results:• Consistent over Nysa town: dense and strong network, similar values• Results confirmed by independent processing of larger crop• No unwrapping errors identified
Interpretation:• In ’90s industrial water level withdrawal stopped due to collapse of heavy
industry• In 1990’s drinking water pumping stopped due to its quality decrease
(increase of fluor content)• The latest precise leveling campaign (2003) does not confirmed
subsidence (Kowalczyk 2006)• Reactivation of tectonic structure ?• „Forebulge” effect due to additional load by water reservoir ?
Conclusions and future work
Conclusions:• Recent tectonic movement have not been clearly detected• Not sufficient data outside urban areas• Urban areas are very sensitive to ground water level changes• The „blind” experiment proved high reliability of PSInSAR resultsTo do:• Re-processing of ifgs. with correction to topography• Re-processing for more representative crops• Alternative processing with different master scene• Remove periodic signal and test other than linear model• Cross-validation with other methods (StaMPS, SBAS)