Volcanic evolution of the Pacific Northwest: From the Cascades Range to Yellowstone (video)

The Pacific Northwest is a volcanological wonderland.

This animation attempts to explain its volcanic evolution over 55 million years.

The Pacific Northwest consists of:

  1. An active volcanic arc (Cascades Range)
  2. A nearby ocean ridge (Pacific Plate-Juan de Fuca Plate spreading ridge)
  3. The world’s youngest flood basalt province (Columbia River Basalt)
  4. A hot-spot chain of eastward-younging volcanoes (Yellowstone Trend)
  5. Volcanism related to continental extension
  6. And more…
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Pacific Northwest volcanism. PNSN

The western margin of North America has long been dominated by subduction and dextral transtension.

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Tectonics of the Pacific Northwest. PNSN

Tectonics of the Pacific Northest yield a varied volcanic history. Thus, the Pacific Northwest is a volcanological wonderland.

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