Boise, Idaho – A magnitude 4.0 earthquake struck 15 kilometers north-northwest of Stanley just after 1:30 a.m. Tuesday, rattling parts of central Idaho following a swarm of smaller quakes throughout Monday.
According to the U.S. Geological Survey, the quake hit at 1:34 a.m. local time (07:34 UTC) at a depth of 16.1 kilometers. It’s the latest and strongest in a cluster of recent seismic activity that has raised concern among geologists and emergency planners across the region.
Communities in and around Stanley, including parts of Custer and Boise counties, may have felt light shaking, though no damage or injuries were reported early Tuesday. Five individuals submitted “Did You Feel It?” reports to the USGS, with intensity levels classified as weak to light. The PAGER system rated potential economic and human impact as minimal.
Residents are advised to check for minor structural issues, secure loose items, and review emergency preparedness plans. Although no major aftershocks are expected, the USGS estimates a 27% chance of another quake above magnitude 3.0 in the next week.
The region is no stranger to seismic events—Tuesday’s quake occurred near the site of Idaho’s 6.5 magnitude quake in March 2020.
More updates will follow if aftershock activity continues.
