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Horrible Today: Live Footage Yellowstone Supervolcano Eruption Threaten Million People Around World
The Yellowstone hotspot has been around for a long time, perhaps more than 50 million years. It appears that this earthquake started off the coast of northern California, and the movement of the North American plate resulted in volcanism that trended across northern and northeastern California and into northern Nevada. Tectonic movements spread these volcanic products northward, and they are now found in coastal areas of Oregon and Washington..
About 20-22 million years ago the hot spot diminished, perhaps because the rise of magma to the surface was blocked by a plate of cold oceanic crust that was replaced by the North American continent. Magma built up beneath the slab and finally broke open nearly 17 million years ago with the eruption of the Columbia River Basalts a massive outpouring of molten basaltic lava that occurred along Idaho's border with Washington and Oregon and caused lava to flow everywhere..