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Earthquake: 1983 Borah Peak, Idaho; Magnitude 7.3, Lost Springs Fault Scarp Ancient and New Borah Peak in Background
A.J. Crone, U.S. Geological Survey
November 30, 1982
earthquake, surface rupture
Part of the 1995-1997 Personalizing the Earthquake Threat publication by the University of Utah Seismograph Stations, Earthquake Education Services; U.S. Geological Survey NEHRP project, award 1434-95-G-2566.
Earthquakes in the Intermountain West are a Mountain-Building Process as Rock Moves Vertically Along a Fault Earthquakes Typically Occur Repeatedly Along the Same Faults. Arrows in this Photo Point Out the New Fault Scarp Face (-9 Feet Tall) Created in the 1983 Borah Peak 10 Earthquake. It is Superimposed on an Ancient Fault Scarp (Vegetated Beveled Area Immediately Above New Scarp). 1983 Borah Peak, Idaho, Earthquake Magnitude 7.3.