News

Most residents of the Island of Hawaiʻi live on one of four potentially active volcanoes and probably have wondered about the threat of lava flows at...

Much is known about how the chemical compositions of gases vary across the Yellowstone volcanic system, but how they vary in time has remained largely...

Read below to learn about USGS hazards science, National Preparedness Month, and resources available to explore various hazards in more detail or sign...

Large quantities of volcanic gases, such as carbon dioxide (CO2), sulfur dioxide (SO2), and hydrogen sulfide (H2S), are released into the atmosphere...

HVO field crews—equipped with specialized safety gear—conduct station maintenance, collect water samples, and monitor for new changes from within the...

Just south of Mammoth Hot Springs, near the north entrance of Yellowstone National Park, lies a jumble of white/gray rock known as the Hoodoos or...

A new USGS Hawaiian Volcano Observatory webcam provides views to the south of Kīlauea caldera in the area of the August 2021 intrusion. Near-live...

We know that when a volcano erupts, molten red rock makes it to the surface, while during an intrusion it doesn’t. The difference between the two...

Kīlauea summit interferogram

HVO scientists deploy temporary Global Positioning System (GPS) sites to collect data from the intrusion southwest of Kīlauea caldera.