Uncovering Yellowstone’s subsurface mysteries

A new study providing an unprecedented regional view of the earth’s crust beneath Yellowstone National Park will begin with a helicopter electromagnetic and magnetic (HEM) survey on November 7, 2016. Scientists hope to distinguish zones of cold fresh water, hot saline water, steam, clay and unaltered rock from one another to understand Yellowstone’s myriad hydrothermal systems. The flights will continue for the next two to four weeks.
Geology News — ScienceDaily