If the theory is proven correct, the consequences could be enormous, spelling a much more risky, explosive future.

In the 1780s, the volcano rumbled to life with such force that it sent high-speed avalanches of hot rock, gas and ash down its slopes. Those flows quickly melted the snow and ice and mixed with the ...

A series of mild eruptions at the most active volcano in the Philippines has prompted the evacuation of nearly 3,000 villagers in a permanent danger zone on its foothills, officials said Wednesday.

On the flanks of Washington State Mount Rainier, a spike in seismic rumbling has revived an old, unsettling question for the Pacific Northwest: what happens when the region’s most dangerous volcano ...