This paper reports in situ test results and
monitoring performed to characterise the development of
a gravitational phenomenon. Analysis made it possible to
create a 3D subsoil model to identify the main
preferential paths of groundwater seepage, the
boundaries of the subsidence area and the relationships
between rainfall and displacements. The results of
seepage and stability analyses highlight some aspects that
characterise the kinematical mechanism of the slope.
Displacements show a constant increase over time
independently from the pluviometric regime.
Stratigraphic sections and geophysical investigations
highlight that the subsidence basin was formed just
above a morphological bedrock depression and was filled
with weathered gypseous arenite and sandy silt. The slow
and constant sinking of the cover may be ascribed to the
progressive collapse of the voids created through
karstification within the gypseous rock mass and which
attract loose material from above causing vertical and
horizontal movements
