Largest Earthquake Will Reach At Least 5.3

The largest earthquake on October 31, 2026 will be 5.3 or larger. The USGS Earthquake Catalog will list a preferred magnitude for the UTC day from 00:00 to 23:59 and that number will round to at least 5.3 in the Magnitude field. Any revision published before 2:00 PM ET on November 1, 2026 will gove…