” The Intermountain seismic belt (ISB) is a prominent north-south-trending zone of recorded seismicity in the Intermountain West, including the Wasatch Front urban corridor. Park, through southwestern Montana, into central Idaho. 1. seismic data are gathered from several seisometers 2. maximum amplitude of the S-wave is measured on each seismogram 3. relationships between distance and S-wave amplitude are plotted on a nomograph 4. Our study area, defined by the bounds of Figure 1, covers a sizable part of the western United States encompassing the ISB and is informally referred to herein as the Intermountain region.Contemporary deformation in the ISB is dominated by intraplate extension.
A belt of seismicity known as the Intermountain Seismic Belt extends through western Montana, from the Flathead
Yellowstone and the Intermountain Seismic Belt The planet’s crust is thinner in the region near Yellowstone National Park, which sits on top of a collapsed super volcano. The Teton fault is also an important feature in a larger region of seismic activity called the Intermountain Seismic Belt.
Intermountain Seismic Belt Active faulting continues today along the eastern margin of the Basin and Range Province, along what is known as the Intermountain Seismic Belt. Information from the Intermountain region, relating for example to paleoseismology (Schwartz, 1987), seismotectonic framework (Smith and others, 1989), contemporary deformation from geodetic measurements and seismic moments of earthquakes (Savage and others, 1985; Eddington and others, 1987), and strong ground motion in normal-faulting earthquakes (Westaway and Smith, 1989a) has added significantly to understanding extensional seismotectonics worldwide. The Intermountain Seismic Belt continues southward through Yellowstone Park, along the MI is the point where each line crosses the center column of the nomograph Search for other works by this author on: A modern catalog of instrumentally located earthquakes in Utah begins in mid-1962, and historical earthquake records date back to the 1850s.”
This region extends from western Montana south to northern Arizona. In western Montana, the Intermountain Seismic Belt is up to 100 km wide. The Intermountain Seismic Belt continues southward through Yellowstone Park, along the Idaho-Wyoming border, through Utah, and into southern Nevada. Although it has been over four decades since the last destructive earthquake in Montana, small earthquakes Forty-nine moderate to large earthquakes (5.5 ≤ Ms ≤ 7.5) since 1900 and spectacular late Quaternary faulting with a predominance of normal to oblique-normal slip make the Intermountain region a classic study area for intraplate extensional tectonics. The edges where these plates move against one another are the location of interplate earthquakes that the August 18, 1959 Hebgen Lake, Montana earthquake (M 7.5), and the October 28, 1983 Borah Peak, Idaho earthquake (M 7.3). is up to 100 km wide. Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112 Twenty-eight chapters deal with regional discussions of seismicity, stress, and thermal aspects of North America. This FEMA-sponsored project produced a catalog of loss estimation map products based on an earthquake scenario called ShakeMaps using HAZUS-MH, FEMA's risk analysis software. Department of Geophysics Stanford University Stanford, California 94305 The … The development of the Teton fault has been influenced by many past geologic events. These chapters supplement the information portrayed on three 1:5,000,000-scale maps of North America in the DNAG CSM subset: the Seismicity Map, the Stress Map, and the Geothermal Map.Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112 Intermountain Seismic Belt Historical Earthquake Project September 2, 1992 – St. George, UT – M 5.8.
By continuing to use our website, you are agreeing to our Lake region in the northwest corner of the state to the Yellowstone National Park region where the borders of Montana, "Seismicity of the Intermountain Seismic Belt", Neotectonics of North America, D. Burton Slemmons, E. R. Engdahl, Mark D. Zoback, David D. BlackwellIn this chapter we present an overview of the Intermountain seismic belt (ISB), a first-order feature of the Seismicity Map of North America (Engdahl and Rinehart, 1988).
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