Washington Geological Survey
Welcome to the official website of the Washington Geological Survey. Our team works to understand and share Washington’s geology. We study hazards including tsunamis, earthquakes, landslides, and debris flows; produce maps of geology and aggregate resources; maintain databases of geologic data; and so much more.
Use the sidebar at right for our most visited pages, and navigate the survey's website using the menu to the left.
Read more about the survey on our about page.
December 2025 Atmospheric River Landslides Clearinghouse Has Been Activated
As of Jan 23, 2026, we have activated the Washington Geologic Hazards Clearinghouse in response to the December 2025 Atmospheric River Landslides event. Visit our Clearinghouse webpage to read more.
What's New
Alluvial Fan Inventory of Portions of Kittitas, Douglas, and Okanogan Counties, Washington
On Apr 2 we published an alluvial fan inventory of portions of Kittitas, Douglas, and Okanogan Counties. Click here to download the pamphlet and click here to view the data on the Washington Geologic Information Portal.
Mine Waste Characterization in Washington State
On Mar 24 we published characterizations of 12 mine waste sites in Washington to support critical minerals assessments and remediation planning. Click here to download the publication package.
The Washington State Coal Mine Map Collection
On Mar 23 we published an updated index and user guide to the Washington State coal mine map collection. Click here to download the pamphlet.
Major update to our Earthquakes and Faults page
On Mar 6 we updated our Earthquakes and Faults webpage. Visit to learn what to do before and during an earthquake, discover what spaghetti has to do with earthquake magnitude, and learn the history of earthquakes in Washington.
New Geologic Information Portal Released
On Feb 24 we published a significant redesigned version of our Geologic Information Portal, with a new interface and improved tools. You can learn more on our Portal webpage.
2001 Nisqually Earthquake Fact Sheet
On Feb 19 we released a new fact sheet about the 2001 Nisqually Earthquake ahead of the 25th anniversary of the earthquake on Feb 28. Click here to download the fact sheet.
1:100,000-scale Geologic Map of the Port Townsend Quadrangle
On Feb 19 we released a compilation geologic map of the Port Townsend quadrangle at a scale of 1:100,000. Click here to download the map and pamphlet.
Visit the Washington Geology News blog to see more announcements and updates.
Visit the past releases page to see publications released more than three months ago.
