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

Articles & Stories

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

Maps and Tools

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

Data Collections

The Oregon Spatial Data Library... more