#hydrothermal-activity

#hydrothermal-activity

Researchers have detected rising temperatures, bubbling gases and unusual sulfur formations inside Mexico's El Chichón volcano, also known as Chichonal. The changes were recorded by scientists from the National Autonomous University of Mexico (UNAM) during monitoring between June and December 2025. The volcano last erupted in 1982, killing at least 2,000 people in one of Mexico's deadliest volcanic disasters. Scientists observed elevated heat, shifting crater-lake chemistry, and gas emissions including hydrogen sulfide and carbon dioxide, which can be hazardous in high concentrations.