Mount Rainier was experiencing "the most significant seismic activity" at the volcano in more than 15 years as an "earthquake ...

Swarms — or clusters of earthquakes that occur in the same area in quick succession — are relatively common on Mount Rainier.

More than 400 earthquakes rattled Washington's Mount Rainier over just 12 hours on Tuesday, sparking fears that the ...

During the Mount St. Helens eruptions, lahars flowed up to 60 miles destroying 200 homes. Lahars are one of the risks with a Mount Rainier eruption, so many foothill communities prepare.

The Office of Civil Defense has warned of a potential lahar hazard flow from Kanlaon, which may endanger 644,487 residents in 13 cities and municipalities on Negros Island, as some areas near the ...

Mount St. Helens killed more than 50 people, but Malone said the death toll could have been far higher without the advance warnings. Regardless, Rainier imperils the areas that surround it.

Lahars aren’t the only thing we should be worried about if Rainier erupts. Air quality would plummet, Adeogun said — a hazard that sometimes gets overlooked.

Mount Rainier’s cousin Mount St. Helens, farther south in the Cascade Range, triggered a devastating lahar when it erupted four decades ago, although it did not reach any densely populated areas.

Mount St. Helens, which cataclysmically erupted in May 1980, ranked as second most hazardous before Mount Rainier in third place. The eruption of the Nevado del Ruiz volcano in November 1985 ...