Scientists on red alert as 'doom volcano' stirs after years of silence

"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."

"Unusual hollow sulfur spheres forming in liquid sulfur pools were also documented inside the crater. Despite the dramatic signs, experts say there is currently no evidence of magma movement beneath the volcano. Researchers stress the activity is likely hydrothermal and does not indicate an imminent eruption. The new findings come from detailed fieldwork and remote monitoring conducted by UNAM's Institute of Geophysics, which has been studying Chichonal's internal dynamics for years."

After more than four decades of quiet, El Chichón volcano in Mexico exhibited rising temperatures, bubbling gases, and unusual sulfur formations during monitoring from June to December 2025. Scientists recorded elevated heat, changes in crater-lake chemistry, fluctuating chloride concentrations, and gas-water interaction alterations indicative of circulating hot fluids beneath the surface. The crater lake shifted from green to grayish, suggesting increased sulfates and silica. Gas sampling found hydrogen sulfide (H₂S) and carbon dioxide (CO₂) accumulating near the crater, which can be hazardous in enclosed or low-lying areas. Unusual hollow sulfur spheres were observed in liquid sulfur pools inside the crater. No evidence of magma movement was detected, and researchers interpret the activity as hydrothermal rather than eruptive.

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