A close link exists between the hydrologeologic mass movements and the observation of
crustal deformation and gravity changes. The observations of crustal movement measure the
sum of the deformation caused by tectonic agents and ambient factors, the most evident of
the latter being thermoelastic deformation and loading due to hydrologeologic fluids. Monitoring
subsurface fluids with geodetic observations is achieved at large scale with satellite
gravity observations from the GRACE satellites. It is shown that the tectonic vertical movement
contributes to the gravity observations and is non-negligible over the Tibet-Himalaya
and the Alpine range. At local scale it is shown that the water flows in Karstic areas are
recovered by geodetic deformation observations of crustal movement and tilting, with GNSS
and subsurface tilt measurements, respectively. The results demonstrate that geodetic gravity
and deformation observations could be developed as tools for monitoring hydrologeologic
systems.
