Long-term ground deformation monitoring using the
Persistent Scatterer Interferometry Wide Area Product
(PSI-WAP) technique for the period 1992-2003,
combined with Differential GPS measurements and
seismicity analysis has provided useful information
about the tectonic motions of the tectonically complex
area of Patras Gulf (Western Greece), and lead to new
insights on the geotectonic regime of this region.
Descending ERS radar images were used to compile the
PSI-WAP product that has been calibrated using the
absolute velocity field of available GPS stations in the
area. It has been found that the deformation of the
southern part of Patras Gulf near the coastline has been
characterized by considerable subsidence (>-5mm/yr),
where unconsolidated sediments usually prevail,
compared to the northern part of the gulf. Significant
subsidence has also been identified in areas along the
down-throw side of possible faults, as well as areas
where extensive ground water pumping has occurred for
irrigation. These results correlate well with local GPS
and seismicity data
