The largest acidic geyser in the world, Echinus Geyser, is active again, with eruptions occurring every 2 to 5 hours, ...

When geologists study volcanic hazards or try to anticipate what a volcano may do in the future, one of their primary tools is to examine the volcano’s past behavior.

Few geological scenarios capture public imagination quite like a full-scale eruption of the Yellowstone supervolcano. The fear is understandable: three massive caldera-forming eruptions have occurred ...

Echinus is also deemed the world’s largest acidic geyser. It is located around 660 feet away from the Steamboat Geyser in the ...

The geyser really came alive in fall 2017. From October 18 to November 10, 2017, Echinus consistently erupted roughly about ...

Valentine Geyser in the Norris Geyser Basin in Yellowstone National Park unexpectedly sprang to life again with 13 documented eruptions in 2025. It's ...

Yellowstone National Park sits atop one of the most studied volcanic systems on Earth, and the question of what a full-scale caldera-forming eruption would do to the United States draws enormous ...

That's the word U.S. Geological Survey volcanic experts used to describe a muddy eruption at Black Diamond Pool in Yellowstone National Park on Saturday morning. Video shared by the USGS on social ...

The bulge first appeared in 1996 and has now returned, but Yellowstone Volcano Observatory says there's no cause for alarm.