Overview

• Mexico’s SSN logged a magnitude 4.0 earthquake at 00:03 on August 28, centered 62 km northwest of Cintalapa, Chiapas, at a depth of 133 km.
• Authorities reported light shaking in nearby communities, no injuries or damage, and no activation of the seismic alert.
• The USGS recorded eight earthquakes above magnitude 2.5 in North America and the Caribbean over the past 24 hours, with six in the contiguous United States.
• The largest in the contiguous U.S. was a magnitude 3.0 quake 14 km south of Dunsmuir, California, at 11:15 UTC, alongside other events cataloged on the USGS real-time map.
• SASMEX activates only when magnitude–distance thresholds are met, and officials continued to emphasize preparedness in a region that averages about 90 quakes above magnitude 4 per year in Mexico.