Fluid inclusions in volcanoes are dominantly composed of carbon dioxide. At magmatic temperatures — 2,192 degrees — the density of the carbon dioxide strongly depends on pressure, which is influenced ...

Many Hawaiʻi Island communities downwind from the eruptive vents in the southwest portion of Halemaʻumaʻu Crater inside the ...

A week-and-a-half after Episode 41 of Kilauea’s yearlong summit eruption deposited tephra — lightweight volcanic glass debris ...

Kilauea has been erupting episodically within the summit caldera since Dec. 23, 2024. Its USGS Volcano Alert level is WATCH.

Lava spewed from Hawaii’s Kilauea volcano during the 41st eruption episode of the current active period on Saturday, January 24. Footage from Epic Lava Tours shows several stages of the volcano’s ...

One of two main craters on Alaska’s Mount Spurr, shown in 1991. Earthquake activity suggested the volcano was close to erupting again in 2025. (Photo by R.G. McGimsey/Alaska Volcano Observatory/U.S.

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

Philippine Institute of Volcanology and Seismology (DOST-Phivolcs) has recorded the largest pyroclastic density current (PDC) since January, causing heavy ashfall that has affected 32 barangays in ...

A gigantic bulge in the north rim of the Yellowstone caldera is the latest sign of volcanic activity in the national park. Geologists call this type of bulge “volcanic uplift.” It’s often caused by ...

The U.S. Geological Survey's Hawaiian Volcano Observatory (HVO) website is currently offline, raising concerns among the public and researchers alike. However, officials have confirmed that this ...

One of the most active volcanoes in the world is gearing up for a spectacular eruption, according to the United States Geological Survey. A high fountaining phase is imminent at the Kilauea volcano on ...

Alaska Volcano FILE - This image provided by Alaska Volcano Observatory shows the summit of Mount Spurr, on Oct. 24, 2024, in Alaska. (Wyatt Mayo/Alaska Volcano Observatory, U.S. Geological Survey via ...