“Ground that the team had walked on just 2 days earlier had developed into an actively boiling pool!” officials wrote on June 22 ...

Yellowstone National Park geologists have confirmed that a small hydrothermal explosion that occurred earlier this month formed a new thermal pool.

Just after 5:09 a.m., on Saturday, June 13, monitoring equipment in Biscuit Basin registered anomalous activity, including seismic energy and a low-frequency acoustic signal, called “infrasound,” ...