| Geologic Information about Washington: From the USGS, an overview of this region's geology. |
| Pacific Northwest Seismograph Network: Operates seismograph stations, locates earthquakes in Washington, and disseminates information on regional earthquake and geologic hazard activity. |
| The Mima Prairie Mounds Just South of Olympia, WA: Photos of naturally occurring earth mounds that are located in Capitol State Forest by Andy Ganse. |
| 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 Division of Geology and Earth Resources: Part of the Department of Natural Resources. Includes bibliography of Washington geology, news, FAQ, links, and educational resources. |
| Washington Obsidian Sources: List of locations that are sources of obsidian across the state. Also includes a scientific bibliography. |
| Washington State Rockhounding: Trips and photos, classifieds, site map, weather forecast, government contacts, and further reading. |
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