A ground uplift in the city of Paris (France) detected by satellite radar interferometry

Research areas:
Year:
2002
Authors:
Journal:
GEOPHYSICAL RESEARCH LETTERS
Volume:
29
Number:
17
Month:
SEP 1
ISSN:
0094-8276
BibTex:
Abstract:
{[}1] We have analyzed a set of ERS-2 images to investigate surface
deformation within the city of Paris using the radar interferometry
technique (InSAR). We show that a large scale uplift phenomenon occurred
during the summer 1998 south of the Saint-Lazare railway station
(maximum amplitude of 1.3 cm +/- 0.3 cm). This area corresponds to an
important underground working site, where the piezometric level has been
lowered during 1995 and 1997. We show that the uplift correlates in time
with the increase of the underground water level during the summer 1998,
some ten months after the end of the main water pumping work. The
amplitude of the uplift corresponds to the amplitude of a subsidence
which was previously observed in the same area. This suggests that the
deformation mechanism is elastic reversible rather than irreversible. A
simple elastic deformation theoretical model matches the InSAR measured
surface deformation.