Chichón Volcano, Mexico
Chichón, a stratovolcano in southern Mexico, shows unusual crater-lake changes and shallow low-magnitude seismicity, indicating an active hydrothermal system; monitoring continues under Yellow alert, phase 2 (abnormal but non-eruptive). Part of the Trans-Mexican Volcanic Belt, it overlies Cocos Plate subduction beneath the North American Plate. The crater lake formed after the 1982 eruption. UNAM uses drones and remote sensing; hazards include phreatic blasts and toxic gases.



