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Olympic-Wallowa Line

 Select a new feature About the Upper Tertiary
Olympic-Wallowa Line
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The northwest-southeast-trending Olympic-Wallowa Line across southern Washington state is a structural zone that includes active earthquake faults. This trend was first described from aerial photographs by Erwin Raisz (1939). Other northwest-trending alignments to the southeast, west of the central Rocky Mountains, perhaps are related geologically to this feature.
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U.S. Department of the Interior
U.S. Geological Survey
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Last Modification: 18 Oct 2000 (ebj)
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