Volcano Watch” is a weekly article and activity update written by U.S. Geological Survey Hawaiian Volcano Observatory ...

Tephra is fragmented volcanic material — including ash, rock and strands of volcanic glass — blasted into the air during an ...

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

Fallout of the particles, as big as footballs, were reported at overlooks in the Hawai'i Volcanoes National park.

Kīlauea’s 2026 eruption shows increased lava fountains and ash spread, with volcanic plumes affecting communities up to 50 miles away. Learn how episodes drive the activity.

Kīlauea has erupted episodically within the summit caldera since Dec. 23, 2024. Episode 43 lava fountaining happened for just ...

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

SHOCKING footage shows the moment a volcano erupted in the Philippines, sending an ash cloud shooting three miles into the ...

A rare satellite image shows Mayon volcano’s 2026 eruption in the Philippines, combining natural color and infrared to reveal lava flows and pyroclastic activity, according to NASA and PHIVOLCS ...

A volcano on Atka Island in the Aleutians has been showing increasing signs of unrest over the past two weeks, and scientists say the uptick in activity is significant enough to warrant a closer watch ...

At least four ash emissions were logged at the Kanlaon Volcano in Negros Island from 9 p.m. on March 20, 2026 until 5 a.m. on ...