Learn how stress inside a volcano can make gas bubbles form early, helping explain why some eruptions stay quiet instead of exploding.

For decades, volcanologists believed that the primary trigger for explosive eruptions was a drop in pressure as magma rises ...

Miles beneath a giant oval-shaped crater punctured in Yellowstone National Park, Wyoming, is a hotbed stirring with restless, agitated magma. It is one of the most aggressive supervolcanoes in the ...

The explosiveness of a volcanic eruption depends on how many gas bubbles form in the magma—and when. Until now, it was thought that gas bubbles were formed primarily when the ambient pressure dropped ...

An underwater volcano off the coast of Oregon that was forecast to erupt sometime this year doesn’t look imminent, according to volcanologists who are closely monitoring it. The Axial Seamount is ...