Over 727 aftershocks recorded after 7.4 Chiapas earthquake

As of July 22, 727 aftershocks have been recorded following the magnitude 7.4 earthquake that struck Ciudad Hidalgo, Chiapas, on July 17, according to the National Seismological Service (SSN) Source: Milenio. The largest aftershock reached magnitude 6.5, consistent with typical post-seismic activity as the crust adjusts Source: Heraldo de México.

Aftershock count evolution

• On July 19, the SSN reported 403 aftershocks Source: Heraldo de México (July 19).
• By July 20, the count had risen to 593 Source: Heraldo de México (July 20).
• The latest update on July 22 puts the total at 727, indicating continued seismic activity Source: Milenio.

Impact and response

Authorities, including President Claudia Sheinbaum and the governors of Chiapas and Tabasco, have maintained communication but reported no serious damage Source: Milenio. The Mexican Navy (Semar) activated a tsunami alert as a precaution but later canceled it after no significant sea-level changes were observed. Civil Protection officials confirmed a “white balance” with no casualties or major structural damage Source: Milenio. The SSN continues to monitor the region, warning that aftershocks may persist for weeks or months.