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From the article :

Yellowstone volcano shock: Scorching mantle rock runs under California, claims geologist

YELLOWSTONE volcano’s mantle rock extends westwards to Northern California and Oregon, a geologist has announced after making the shocking discovery.


The Yellowstone volcano mantle rock has spread sideways for more than 500 miles (804km) from Wyoming in Northwest US, moving deep below the Earth’s crust. The mantle rock is a source of scorching, low-density rock that has fuelled the supervolcano’s past major eruptions. For a long time, geologists have suspected Yellowstone sits on top of a mantle plume – long columns of hot rock that channel heat from deep inside of the planet. Victor Camp, a geologist at San Diego State University (SDSU) in the US, has now found how the mantle rock has moved towards the Pacific over long periods of time...

More info in the article linked including pictures and a video demonstration...

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