A provocative new hypothesis suggests that Yosemite Valley was carved by an ancient volcano and a disappearing river, both of ...

Japan is stepping up its volcano research that trails far behind its advanced studies on earthquakes despite being home to 111 active volcanoes, about 10 percent of the global total.

Instead, Yosemite granite had a deeper source. Huge volumes of magma -- hot, molten rock -- pooled up in large chambers below that ancient volcanic landscape. Just as ice crystals develop on ...

A new study has investigated the use of a new monitoring technique for early warning of a volcanic eruption. The research team compared the earthquake signals during two eruptions of Ontake Volcano in ...

After evaluating the 111 active volcanoes scattered across Japan, a research committee announced on Sept. 25 that it identified eight needing further investigation based on several factors.