New conclusions surface about the mighty supervolcano in Yellowstone National Park, often cited for a massive eruption that covered the region in hot ash.
American West Geology
New images from the University of Utah suggest that the large plume of partly molten rock underneath Yellowstone may be larger than previously believed. However, no predictions of when a cataclysmic eruption of the famed supervolcano might occur were offered.
The lower portion of the McGinnis Glacier was observed covered in cracks, crevasses and ice pinnacles — evidence that the glacier moved forward.
It is believed that about 640,000 years ago (during the Pleistocene epoch), a massive volcano erupted, creating a caldera in the center of what is now Yellowstone National Park.
Over millions of years, sediment typically accumulates to great depths, from one-half mile to nearly 2 miles, and in rare cases, 3 miles deep.
The Eastern California Shear Zone runs roughly parallel to the San Andreas Fault from the Gulf of California and is a wide area in western Nevada.
A powerful earthquake that rocked Alaska in 2002 changed the timing and behavior of some of Yellowstone’s geysers and hot springs.