Publication Date:
2019-10-18
Description:
We studied the surface deformations affecting the southeastern sector of the Po Plain sedimentary basin, in particular the area of Bologna. To
this aim an advanced DInSAR technique, referred to as DInSAR–SBAS (Small BAseline Subset), has been applied. This technique allows
monitoring the temporal evolution of a deformation phenomenon, via the generation of mean deformation velocity maps and displacement time
series from a data set of acquired SAR images. In particular, we have processed a set of SAR data acquired by the European Remote Sensing
Satellite (ERS) sensors and compared the achieved results with optical levelling measurements, assumed as reference. The surface displacements
detected by DInSAR SBAS from 1992 to 2000 are between 10 mm/year in the historical part of Bologna town, and up to 59 mm/year in the NE
industrial and agricultural areas. Former measurements from optical levelling referred to 1897 show 2–3 mm/year vertical movements. This trend
of displacement increased in the second half of the 20th century and the subsidence rate reached 60 mm/year. We compared the more recent
levelling campaigns (in 1992 and late 1999) and DInSAR results from 1992 to 1999. The standard deviation of the difference between levelling
data, projected onto the satellite Line Of Sight, and DInSAR results is 2 mm/year. This highlights a good agreement between the measurements
provided by two different techniques. The explanation of soil movements based on interferometric results, ground data and geological
observations, allowed confirming the anthropogenic cause (surface effect due to the overexploitation of the aquifers) and highlights a natural,
tectonic, subsidence.
Description:
Published
Description:
304-316
Description:
1.10. TTC - Telerilevamento
Description:
JCR Journal
Description:
partially_open
Keywords:
InSAR
;
surface deformation
;
SAR interferometry
;
04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous
;
04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring
;
04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy
;
04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
;
04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
;
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
