Biggest October 1 Quake Will Hit 5.3 Or Higher, USGS Warns

The biggest earthquake on October 1, 2026 will be reported at 5.3 or higher in the USGS preferred magnitude field. The USGS Earthquake Hazards Program will assign that magnitude within the UTC calendar day 00:00 to 23:59 UTC and the value will be shown rounded to one decimal place. The catalog perm…