USGS · 70168605
The Pocatello Valley, Idaho, earthquake
Abstract
A Richter magnitude 6.3 earthquake occurred at 8:31 p.m mountain daylight time on March 27, 1975, near the Utah-Idaho border in Pocatello Valley. The epicenter of the main shock was located at 42.094 ° N, 112.478° W, and had a focal depth of 5.5 km. This earthquake was the largest in the continental United States since the destructive San Fernando earthquake of February 1971. The main shock was preceded by a magnitude 4.5 foreshock on March 26.
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A. M. Rogers, C.J. Langer, R.C. Bucknam. 1975. The Pocatello Valley, Idaho, earthquake. https://pubs.usgs.gov/publication/70168605
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