Geological and seismological studies show that earthquakes are likely to happen in any of several active zones in Idaho and adjacent states. Idaho has experienced two large earthquakes in historical times: the 1959 Hebgen Lake earthquake (M7.3) and the 1983 Borah Peak earthquake (M6.9).
Did you feel an earthquake?
- Report it and view regional maps of shaking intensity.
Idaho Earthquake Images
Eight photos (below) by IGS staff of the fault scarps and damage caused by the 7.3 magnitude Borah Peak earthquake in 1983 near Challis in east-central Idaho. Images are taken from the IGS publication The Borah Peak Earthquake: A 35-mm Slide Set for Earth Science Educators, S-95-3.
Site Class & Liquefaction
NEHRP site class maps, liquefaction susceptibility maps, and associated metadata are located under the study location heading. For example, the Idaho Falls-Rexburg webpage will contain information and digital data related to NEHRP and liquefaction susceptibility research.