Overview

• USGS data for Aug. 29 lists 22 earthquakes of magnitude 2.5 or greater across North America and the Caribbean, including repeated M3.2–3.6 events near Valmy, Nevada and a M5.5 west of Adak, Alaska.
• The previous day’s listings included a M3.0 near Dunsmuir, California and a M5.9 west of Adak, underscoring steady activity in Alaska’s Aleutian zone.
• Mexico’s SSN reported a M4.0 quake on Aug. 28 at 00:03 local time, 62 km northwest of Cintalapa, Chiapas at 133 km depth, and authorities reported no damage.
• SASMEX did not issue alerts because the Chiapas event and other recent tremors stayed below activation criteria that combine magnitude with distance from coverage areas.
• UNAM/SSN note Mexico records more than 15,000 quakes annually, and officials emphasize preparedness as public attention turns to September’s earthquake anniversaries without scientific evidence of a date-based pattern.