Its name derives from the Spanish word for sulfur, azufre. The volcano is considered semi-dormant but there are numerous fumaroles in the summit crater. The summit of the volcano has an altitude of , and the north-western side of the crater contains a crescent-shaped lake named Laguna Verde () at .
The name of this volcano is derived from the Spanish word for sulfur, azufre. As a semi-dormant volcano, it features numerous fumaroles in its summit crater. The summit has an elevation of , and on its north-western side lies a crescent-shaped lake named Laguna Verde () at .