Overview

• Early on August 24, the SSN logged three tremors, the strongest at magnitude 4.2 in Chiapas and a 4.1 in Veracruz, without activating the alert in Mexico City.
• At 03:14 local time on August 23, a magnitude 5.9 earthquake struck offshore El Salvador at 10 km depth and about 252 km southeast of Ciudad Hidalgo, and it was felt weakly in Chiapas.
• Authorities in El Salvador and Guatemala reported no casualties or material damage from the 5.9 event, no tsunami alert was issued, and a later magnitude 4 quake in Guatemala’s Jutiapa also had no consequences.
• Mexico’s seismic alert for the capital only triggers when distance and magnitude thresholds are met, such as around magnitude 6 for sources beyond roughly 350 km and about 5 for 250–350 km.
• The SSN reports 21,824 earthquakes in Mexico through the morning of August 22, most between magnitude 3.0 and 3.9, including 26 overnight events that day with a maximum of magnitude 4.1 in Oaxaca and Chiapas.