A seismologist from Seattle discussed recent volcanic activity across the United States. Here's what you should know.

Icelandic authorities now say threats of wildfires have officials on "high" alert and that eruption fissures were bigger than scientists initially thought after Wednesday's eruption of the once-dorman ...

A 7.3-magnitude earthquake struck off the coast of the US state of Alaska on Wednesday, triggering a tsunami warning, the US Geological Survey said.The ...