Solimana rises above an approximately high basement. It has a caldera, which gives it an asymmetric appearance; further on the south flank both the basement and inner parts of the edifice crop out. This asymmetry was caused by large sector collapses and subsequent erosion of the southern flank. The main edifice is formed by a compound volcano accompanied by lava domes and lava flows as well as pyroclastic flows and lahars, the latter relating to the formation of the collapse structure.