Geophysical data acquisition - OGS

The purpose is to merge the land and marine gravity data to obtain a higher
spatial definition of the gravity anomalies near the coastline and a gravity map
that is overlapped with the geological maps at scale 1:50.000. In particular we
have been required an underwater gravity survey and a surface marine gravity
survey. The first survey has been completed while the second one will be
carried out in february 2001.
2) Two micro-gravimetry nets have been established in order to study the
temporal gravity variations associated with: a) water table fluctuations to study
the effective porosity of the geological formations involved (Fagagna area); b)
the subsidence problems that affect some districts of the city of Trieste; this
survey is jointly carried out with SAR techniques.
In the near future we will repeat measurements in a network located in
seismically active areas of Friuli-Venezia Giulia.
3) Several micro-gravity surveys have been planned in order to detect the
presence of cavities in the Carso area surrounding the city of Trieste: One
survey is ongoing in the “Grotta Doria”, with the aim to model the gravity
anomalies and to compare the results obtained with several geophysical
techniques applied to the same geological feature.
4) Our group is active also in data Antarctica were we acquired a gravity transect
(see Figure) crossing the Wilkes Basin (East Antarctica).
AHVRR image of
Antarctica with
superimpose the ITASE
traverse along which
the gravity profile has
been acquired (above).
Free air gravity profile
acquired across the
Wilkes Basin, East
Antarctica (below).
Free Air gravity anomaly (mGal)
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