We used C-band data from the ESA satellites (ERS, ENVISAT and SENTINEL-1) to map ground motion patterns in the vicinity of Evinos dam in central Greece. The stability of the body of the dam was also examined. In the dam reservoir area, we obtained displacements up to 17 mm/year along the line of sight (LOS) in the vicinity of village Klepas (ENVISAT dataset; 2003- 2010). Several active landslides in the InSAR data were confirmed on the field (September 2017). Regarding the dam body, ENVISAT data show no significant deformation (less than 7 mm/year along the LOS). The SENTINEL-1 data (up to 2017) continue to show the same behaviour, however, a periodic signal and differential deformation on the dam body of the order of -8 mm/year along the LOS were detected and needs further investigation. We also mapped small ground motions inside several villages upstream the dam. A new landslide inventory for the dam upstream area was created from optical data.
Indonesia is periodically affected by severe volcanic eruptions and earthquakes, which are geologically coupled to the
convergence of the Australian tectonic plate beneath the Sunda Plate. Multi-temporal SAR interferometry (MTI) can be
used to support studying and modelling of terrain movements. This work is aimed at performing an analysis of ground
displacements over Indonesian sites through MTI techniques. Test sites have been selected according to the availability
of archived SAR data, GNSS networks, and geological data. A stack of COSMO-SkyMed data, acquired in stripmap
mode between 2011 and 2015, has been selected over the Banda Aceh region in Sumatra island. Geological maps of the
test sites are available, and several GNSS stations from the Continuously Operating Reference Stations Indonesian
network are found in the area of interest. Both the SPINUA and the StaMPS MTI algorithms have been used for
processing the data, and deriving displacement maps. The ground deformations detected on the area are interpreted
according to the available geological and geophysical information. The MTI results seem to confirm the inactivity of the
Aceh fault segment, while the lack of coherent targets hinders reliable displacement measurements along the Seulineum
segment. MTI data additionally allowed to identify local, non-tectonic ground instabilities: several areas are affected by
subsidence due to unconsolidated coastal and alluvial sediments, deserving more investigations by local authorities.
Finally, MTI results could be useful to integrate and update data from the existing GPS network.