A coseismic displacement field is particularly important for earthquake studies. Since their launch in 2014 and 2016

ESA's Sentinel-1A/Sentinel-1B satellites have been acquiring large amounts of SAR images from all major plate boundary regions. Thus

these satellites are well suited for this task. We review the principle of Sentinel-1 imaging modes and the latest data process techniques through case studies of the 2014 Napa Valley

2015 Nepal

2016 Kumamoto

and 2016 New Zealand earthquakes. We introduce how to utilize the coherent and incoherent information of Sentinel-1 data fully to map coseismic displacements in near and far fields

along the line of sight and in along-track directions. The latest technical development and case studies show that we can derive not only a smooth coseismic displacement from the far field but also a displacement close to the rupture trace

demonstrating that the Sentinel-1 system plays an increasingly important role in earthquake studies.