It was small by volcanic standards, but massive by human ones: on this day in 1980, Mount St. Helens erupted in what the ...

The eruptions at Kilauea prompted closures at a national park and part of a highway because of falling glassy volcanic fragments, including ash.

A vast eruption beneath the southwest Pacific Ocean has been confirmed as the largest volcanic event ever recorded on the ocean floor. The 2012 explosion at the Havre volcano, near New Zealand, ...

Hawaii's Kīlauea volcano's latest eruptive episode produced arching bands of red lava higher than some skyscrapers.

Back in January, SFGATE was on the ground in the national park during a previous eruption episode that also rained tephra ...

Authorities reported tephra fall—including ash, Pele’s hair, and larger fragments—across Hawaiʻi Volcanoes National Park.

Visual observations have been a backbone in studies of volcanoes, from 2,000 years ago to now. They remain fundamental to understanding how volcanoes work, and technological advancements, such as ...

When massive volcanic eruptions occur, they inject millions of tons of sulfur dioxide into the stratosphere, where it forms sulfate aerosols that scatter incoming solar radiation and result in global ...