Proceeding of the Joint International Symposium on Deformatuon Monitoring. 2-4 November, 2011. Hong Kong. China. Report. In Western Greece, the Ionian Islands are situated in a transitional zone described by a high crustal deformation rate as revealed by the high shallow seismicity of this zone, which is the highest in Greece. The tectonic behaviour of the region is characterised by transcurrent fault systems such as the transform fault of the Cefalonia Island with right-lateral slip of the order of about 3cm/yr, which appears to be the fastest fault slip observed so far in the Hellenic region. Repeated GPS campaigns have been carried out covering the broader area of the Ionian Islands. So far, the analysis of these data has provided reliable estimates of the secular motion of the free surface. In the present work an attempt is made to assess the Coulomb stress change associated with well documented earthquake activity in Western Greece (Ionian Islands) and especially the island of Zakynthos which has suffered several times from the occurrence of intermediate magnitude earthquakes. The efficiency of the earthquake modeling is further evaluated by comparing the free surface displacement fields corresponding to the Coulomb stress changes with the ones derived from the GPS observations.