Overview

• Specialists from SSN, UNICACH and CENAPRED documented a slight rise in seismicity between June 6 and August 21, 2025.
• Chiapas civil protection reported 39 earthquakes on August 18 within about two kilometers of the crater, representing 72% of recent local seismicity.
• CNPC, CENAPRED and state agencies installed a Puesto de Mando and increased 24/7 seismic, thermal, geochemical and visual surveillance.
• Access to the crater is restricted to authorized researchers, the scientific advisory committee remains in permanent session, and outreach to nearby communities is ongoing.
• The 2021 operational plan with mapped risk zones, evacuation routes and ready shelters remains in place, with updates to be issued through official channels.