1500 volcanoes on the Earth are potentially active. One third of them have been active during this century. At the beginning of the third millenium, 10% of the world population is living in areas directly threatened by these potentially active volcanoes. The aim of this work is to provide the control simulator of the Pleiades mission (C.N.E.S.) with data on volcanic risks. The simulation is made on the basis of the real activities of the world volcanoes in the period 1999-2001.