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Map showing earthquake epicenters (1964-81) in Yellowstone National Park and vicinity, Wyoming, Idaho, and Montana Map showing earthquake epicenters (1964-81) in Yellowstone National Park and vicinity, Wyoming, Idaho, and Montana
The earthquake activity in the Yellowstone region is part of a belt of seismicity extending from southern Utah to northwestern Montana. The 1959 magnitude 7.3 Hebgen Lake earthquake is the largest historical event along this trend. Yellowstone National Park is also the focus of extensive Quaternary volcanic activity that relates to a long lived volcanic system that has progressed from...
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Map showing geochemical favorability for mesothermal base- and precious-metal veins in the Wallace 1° by 2° Quadrangle, Montana and Idaho Map showing geochemical favorability for mesothermal base- and precious-metal veins in the Wallace 1° by 2° Quadrangle, Montana and Idaho
This map shows the geochemical favorability for mesothermal base- and precious-metal veins in the Wallace 1° by 2° quadrangle, Montana and Idaho. The information presented here is part of the Wallace CUSMAP (Conterminous United States Mineral Assessment Program) project conducted by the U.S. Geological Survey.
Map showing late Quaternary faults and 1978-84 seismicity of the Los Angeles region, California Map showing late Quaternary faults and 1978-84 seismicity of the Los Angeles region, California
The Los Angeles region of California faces the greatest seismic risk of any part of the United States. The region is inhabited by more than 11 million people and is one of the Nation's key commercial and industrial centers. It lies astride a web of potentially active faults, including those segments of the San Andreas fault with the highest probability for generating a great earthquake...