Geology

Geology

Oregon’s spectacular geologic landscape results from millions of years of volcanic eruptions, earthquakes, and fire and floods.

Articles & Stories

Do not let the bucolic appearance of the Willamette Basin lull you into the feeling that this...
Earthquakes An earthquake is defined as the "perceptible trembling to violent...

Maps and Tools

With hundreds of map layers available to draw from, you can use the Oregon Explorer Map Viewer... more

Data Collections

The Department of Administrative Services (DAS) is the central administrative agency of state... more