Yellowstone molten rock goes 400 miles deep

I don't understand all of this article yet, but I just started reading that Yellowstone's molten rock plumbing goes 400+ miles deep. The scary part says "so a future cataclysmic eruption could be even larger than thought."

Okay, wow, it gets worse:

"The study's of Yellowstone's plume also suggests the same "hotspot" that feeds Yellowstone volcanism also triggered the Columbia River "flood basalts" that buried parts of Oregon, Washington state and Idaho with lava starting 17 million years ago.

Yikes.