The Mount St. Helens eruption anniversary prompts investigation into the California earthquakes: eruption history, threat levels.

The state of Arizona and its picturesque landscapes have been shaped by a geological history of volcano eruptions across the region. Some of the oldest volcanic rocks in the state are 1.8 billion ...

From the ever-active Kilauea in Hawaii to the infamous Mount St. Helens in Washington, the United States has some of Earth's most notable (and notorious) volcanoes. And despite their obvious dangers, ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. (KTXL) — California is known for its beaches ...

As University of Delaware doctoral student Abigail Nalesnik was slowly lowered down via helicopter to the floor of Halema‘uma‘u pit crater, located within Kaluapele, the summit caldera of Kīlauea ...

Washington state’s Mount St. Helens erupted catastrophically in 1980, killing 57 people. That eruption sent ash soaring over 80,000 feet and raining down as far as 250 miles away. Mauna Loa is not ...