On 23 November 2014, an eruption started on Fogo Volcano (Cape Verde), almost 20 years from the previous one.
On 23 November 2014, an eruption started on Fogo Volcano (Cape Verde), almost 20 years from the previous one.
The two Sentinel-1 images were acquired in TopSAR Interferometric Wide (IW) mode (VV polarisation) along an ascending path. The data captured the first sin-eruptive deformation and was used to estimate the displacement pattern over the caldera. The incidence angle of the analysed sub-swath is 34 degrees, with a spatial resolution of approximately 15m.
The differential interferogram (using GAMMA software tools) has been computed by removing the topographic phase with SRTM DEM and applying a multilook (4 x1 in range and azimuth) in order to maintain full resolution. Finally a MCF algorithm has been applied for phase unwrapping.
The image below shows the displacement field in metres.
Source: INGV - Satellite Remote Sensing unit