Collaboration between Oregon State University and IRIS
The Pacific Northwest is a volcanological wonderland. The western margin of North America has long been dominated by subduction and dextral transtension. Ocean-ridge rifting produces submarine volcanism offshore. Subduction of the young Juan de Fuca Plate creates the arc of Cascades volcanoes. Hot-spot volcanism drives the Yellowstone caldera system. Continental extension of the Basin and Range province, plus a northward migrating triple junction add to a complex volcanic history.
Using map view in concert with cross sections, this animation steps the viewer through both volcanic and simplified tetonic processes.
CLOSED CAPTIONING: A .srt file is included with the download. Use an appropriate media player to utilize captioning.
Tectonics of the Pacific Northest yield:
- Active ocean-ridge volcanoes
- Cascades Arc of subduction related volcanism
- Back-arc volcanoes
- Yellowstone Hotspot
- Basin and Range lava fields