Internet Directory - Top : Regional : North America : United States : Washington : Science and Environment : Geology
The Pacific Northwest Seismograph Network
Based at the University of Washington, the PNSN operates seismograph stations and locates earthquakes in Washington and Oregon and provides information on Pacific Northwest earthquake activity and hazards.
Washington Obsidian Sources
List of locations that are sources of obsidian across the state. Also includes a scientific bibliography.
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