The Democratic Republic of Congo in its eastern part, particularly in the Virunga region, is threatened by two active volcanoes, namely Nyiragongo and Nyamulagira. The Nyiragongo volcano presents the greatest threat to the city of Goma, and is characterized by a permanent lava lake and fractures crossing the city into Lake Kivu. The monitoring of this volcano requires a regular follow-up of these fractures, which are weak zones where lava can easily come out. It is in this perspective that we studied the influence of tectonic activity on the active bills on the southern flank of this volcano. This study has allowed us to see, after analysis of the measurements made by the extensometer, how tectonics and magmatic intrusions play on the spreading of the southern fractures of the Nyiragongo volcano. We understand that the tectonism of this area causes movements of the earth's crust which in turn generate earthquakes in the area and are responsible for elastic deformations; the latter can also motivate the magmatic intrusions allowing the dilation of fractures and the opening of faults (plastic deformations). Based on the results of extensometric measurements carried out between 2004 and 2008 in the Summit, Bitunguru, Cabane and Munigi fractures, we have noticed that the latter have experienced elastic deformations during possible earthquakes that occurred in the Lake Kivu basin and plastic deformations due to magmatic intrusions especially in 2006 and 2007.