By Brett French | Billing Gazette
Three areas in Yellowstone National Park’s caldera seem to have the highest probability for volcanism, according to a recently published study.
The faults are near the western rim of the caldera south of West Yellowstone, one in the central region extending south from Norris to about Grant Village, and the third near the northeastern edge of the ancient volcano’s rim extending from about Canyon Village south past Lake.
The information was collected in a study done by Guillaume Girard and John Stix. They both worked at the Department of Earth and Planetary Sciences at McGill University in Montreal at the time, but Girard has since relocated to the University of Iowa.
“Those guys have done a good job,” said Bob Smith, a University of Utah researcher who has long studied the geodynamics of Yellowstone. Smith said he couldn’t comment on their geochemistry, since he’s not a volcanologist, but Girard and Stix came to the same conclusions that Smith has about the northwest-trending faults that are zones of weakness in the caldera.
The scientists based their predictions on studies they made of two of Yellowstone’s youngest magma flows — the western and central faults — as well as the region in the northeast that has seen “notable geophysical unrest.”
“It’s a nice synthesis of what we know about Yellowstone’s volcanic history and prospects for future activity,” said Jacob Lowenstern, scientist-in-charge of the Yellowstone Volcano Observatory, in an email. “Most is based on previous work by others, but the article puts it together in an easy-to-read format.”
Molten rock lies very near the surface in Yellowstone, only a few miles underground. All of that heat is what powers the park’s many geothermal features, including mudpots, fumeroles and geysers like Old Faithful.