Fig. 3

Ground deformation at Wolf volcano between 16 April 2014 and 25 August 2015 obtained from CSK data on descending track. The map shows the cumulative ground deformation superimposed on a SAR multilook amplitude image of the area; red color means movement away from the satellite, blue towards it. The map is in radar coordinates: line of sight is from right to left with a look angle of about 47 degrees, while the white arrow indicates the North direction. The time series of two selected points located on the tops of the volcano are also presented. The eruption time period is highlighted in red. Time series (a) highlights a deformation of about 50 cm away from the satellite during the eruptive period; on the time series (b), a smaller deformation towards the satellite (partially recovered after the eruption) is observed