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Volcanic evolution of the Pacific Northwest: 55 million year history

OSU/IRIS Collaboration--Pacific Northwest Earth-science series. Tectonics of the Pacific Northest yield a varied volcanic history. The Pacific Northwest boasts an active volcanic arc (Cascades Range), a nearby ocean ridge (Pacific Plate-Juan de Fuca Plate spreading ridge), the world’s youngest flood basalt province (Columbia River Basalt), a hot-spot chain of eastward-younging volcanoes (Yellowstone Trend), volcanism related to continental extension, and more. It is a volcanological wonderland. The western margin of North America has long been dominated by subduction and dextral transtension. This animation attempts to simplify a complex tectonic interaction through cross sections. This animation was created to accompany a Plenary talk at the 2017 IAVCEI meeting in Portland, OR. Written and directed by Anita Grunder, Oregon State University Graphics, animation, & narration by Jenda Johnson,Earth Sciences Animated Reviewed by Ray Wells, U.S. Geological Survey