“The Yellowstone system is one that’s been stagnant for a long time.” The volcano’s largest eruption, which earned it the title of a supervolcano, occurred 2.1 million years ago.

The caldera is the enormous volcanic crater left from the last time Yellowstone experienced a giant eruption, 640,000 years ...

A large eruption that generates lots of heat will carry the ash high into the atmosphere. The Mount Pinatubo eruption in the Philippines in 1991 shot ash up into the air 114,000 to 130,000 feet high.

Michael Poland, the lead scientist-in-charge of the Yellowstone Volcano Observatory, said the Biscuit Basin has a history of small eruptions.

The volcano’s eruption, which occurred in a closed-off area due to its resulting hazardous conditions, began around noon and ended at 8:08 p.m., officials say.

The Phlegraean Fields is a large volcanic caldera west of Naples, Italy. (CREDIT: CC BY-SA 4.0) “Yellowstone in many ways is a laboratory volcano,” said Poland.

Scientists with the U.S. Geological Survey's Hawaiian Volcano Observatory said the fountains were likely to go higher. "Here we go again!" the observatory wrote on its Facebook page.

US News Hawaii’s Kilauea Volcano erupts for the 25th time since December with lava reaching over 330 feet By Associated Press Published June 11, 2025, 9:34 p.m. ET ...

Yellowstone visitors watched in horror as a bison fell into the Grand Prismatic Spring, struggling to escape the boiling water in a tragic wildlife event.

The volcano may not erupt. But if magma quickly fills the chamber and an eruption does occur, the ground will likely bulge or otherwise change shape, a process called deformation.

The incident happened Saturday, June 21, just before 7 a.m., according to Yellowstone National Park visitors who witnessed the bison’s demise.