Studying tree rings helped scientists pinpoint when Mount Rainier last sent a lahar down its steep slopes, which could help planners anticipate future mudflows.

This year, the Earth’s core put on a show unlike any other, with volcanic eruptions that dazzled observers from every continent. Some of these eruptions were so breathtaking they left viewers ...

SURABAYA, Indonesia – Indonesia's Mount Semeru volcano erupted Wednesday afternoon around 4:00 p.m. local time, sending ash more than 6,500 feet into the air, according to data from the country's ...