Overview

• Specialists from SSN, UNICACH and CENAPRED documented a slight rise in earthquakes between June 6 and August 21 along with hydrothermal changes that could reflect internal magmatic movement.
• Protección Civil de Chiapas reported 39 quakes on August 18 within two kilometers of the crater, accounting for 72% of recent seismic activity.
• Authorities closed access to the crater and instituted round‑the‑clock seismic, thermal, geochemical and visual surveillance with the Scientific Advisory Committee in permanent session.
• Federal and state agencies activated a command post in Chapultenango under the Incident Command System, updating the special protection program and verifying nearby communities within a 5 km radius.
• Preparedness follows the 2021 operational plan with hazard maps, marked evacuation routes and ready shelters, and residents are urged to rely on official bulletins and avoid spreading rumors.