By the end of the day, about 7 p.m. Pacific Standard Time, data from 16 crystals was collected and analyzed. The data, which ...

Increasing volcanic activity at the over 11,000-foot-tall, snowcapped volcano in Alaska is likely a sign of its impending first eruption since 1992, experts say. Mount Spurr, located about 75 miles ...

One of the largest active volcanoes has been rocked by a series of earthquakes, putting experts on high alert and prompting ...

In a remote corner of the U.S., active volcanoes wait patiently above the ridgelines, leaving residents on edge.