The proposed project aims at assessing the use of TANDEM-X to study an active volcanic zone. The Virunga Volcanic Province(VVP) has been selected for several reasons. The VVP is located in a region that has suffered from recurrent and persistent conflictswhich increase the vulnerability of the population and make difficult an appropriate ground based monitoring system. Thus remotesensing is among the best and the most reliable technique to study its volcanic activity. Volcanic hazards are very important andthreaten more than 1 million inhabitants. The majority of the team has more than 5 years of field experience in that area.