Experts believe a Mount Rainier eruption would post a grave threat to millions who live in the southern and eastern sections ...

The snowcapped peak of Mount Rainier, which towers 4.3 kilometers (2.7 miles) above sea level in Washington state, has not produced a significant volcanic eruption in the past 1,000 years.

Unlike the Pacific Northwest’s steep-sloped Cascade volcanoes such as Mount St. Helens or Mount Hood that tend to explode ...