New WGS Glacial Geology Webpage and Ice Age Floods Story Map

We at the Washington Geological Survey just released an ESRI Story Map about the ice age floods in Washington.  The Story Map, entitled Washington’s Ice Age Floods, is included on our new glacial geology webpage. Check them out! Glaciers Webpage We’ve built lots of new interactive content about glaciers on our new webpage. Learn about glacial […]

Lidar Imagery Now Available for Viewing on the Washington Geologic Information Portal

It’s finally here!  You can now view lidar imagery in our Geology Portal. We’ve added mosaics of both bare-earth and top surface lidar hillshades to the list of available base layers. What’s a Lidar Hillshade? Lidar hillshades are renderings of the lidar elevation model using simulated illumination. Bare-earth lidar shows only the ground surface (trees, vegetation, […]

Statewide Protocol for Landslide Mapping from Lidar Data Released

The Washington Geological Survey is pleased to announce a new publication that explains the detailed protocol that Survey geologists are using to systematically map landslides using lidar. This protocol closely follows the methods used by Oregon Department of Geology and Mineral Industries to map landslides in Oregon. The objective of the protocol is to establish standardized methods for […]

New guide helps homeowners identify landslide hazards

The Washington Geological Survey, in partnership with the Oregon Department of Geology and Mineral industries, has published a Homeowners’ Guide to Landslides. It is available on the Washington Geological Survey’s webpage at for download. Landslides do not have to be large-scale events to cause lots of damage. When homes or infrastructure are built on landslides […]

Our new online databases put geologic hazards information at your fingertips

The Washington State Department of Natural Resources (DNR) has pre-released a beta version of its new lidar database to make information on geologic hazards impacting Washington communities available with the click of a mouse. “This portal puts lidar data at the fingertips of scientists and others interested in geology,” said State Geologist Dave Norman. “As […]

December TsuInfo Now Available

This issue of TsuInfo includes articles on: National Tsunami Hazard Mitigation Program Multi-State Project: California and Hawaii collaborate on tsunami response playbooks Worldwide response to World Tsunami Day Also featured are tsunami project updates, news, newly published research, and upcoming events Find this month’s issue here A copy of this publication is free upon request and is […]

Keep an eye out for landslide risks after record autumn rains — Ear to the Ground

This autumn has been one of the most consistently-rainy in western Washington records, meaning you should keep a sharp eye out for landslides. Prolonged rain increases the chances of shallow landslides on hillsides and other steep slopes. According to the National Weather Service’s Seattle office, western Washington has seen more days of rain in October […] […]

Portal Update

We’ve updated some of the data on our Geologic Portal including: tsunami evacuation maps and surface geology at 1:24,000 and 1:100,000 scales. For tsunami evacuation, we’ve fixed some wonky data and more importantly, added the evacuation zones and routes for the area surrounding the Port of Tacoma. We’ve also updated our 24k geologic mapping data with […]

Newly Published:

Geologic Map of the Granite Falls 7.5-minute Quadrangle, Snohomish County, Washington This publication is the result of our yearly 1:24,000-scale mapping efforts throughout the state and provide a detailed level of geologic mapping. Efforts are on-going to completely map the state at this scale. Suggested citation: Dragovich, J. D.; Mavor, S. P.; Anderson, M. L.; Mahan, […]