USA - ALASKA
GEOLOGICAL SETTINGS
ALASKA:
USA
Plate Tectonics of the Western United States
Plate tectonic map of the Western United States and nearby Pacific Ocean. Volcanoes shown by red triangles. Arrows show direction of plate movement. Teeth (black triangles) are on the overriding tectonic plate. Mid-ocean ridges (spreading centers) shown as thin white rectangles.
Simplified cross-section of the subduction zone that produces the volcanoes of the Cascades.
After "Volcano World" - Based on diagrams in Foxworthy and Hill (1982).
Foxworthy, B.L., and Hill, M., 1982, Volcanic eruptions of 1980 at Mount St. Helens: The First 100 Days: U.S. Geological Survey Professional Paper 1249, 124 p.
North America Plate:
San Andreas transform system:
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VOLCANOES (Alaska)
VOLCANOES (USA)
