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Mount Rainier is one of many volcanoes in the Cascade Mountain Range. It is one of the tallest mountains in North America, and it did not gain this topographic stature by frequently blowing its top as Mount St. Helens did in 1980 or Mount Mazama did around 5677 B.C. creating Crater Lake; its tall stature would seem to indicate most of its eruptions have been "mountain-building" -- creating new rock from lava flows.

However, Mount St. Helens and Mount Mazama are also both part of the same Cascade volcanic mountain range as Mount Rainier, so a mountain-destroying eruption similar to the St. Helens or even Mazama blasts (the latter, obvious by means of its more complete self-destruction, much stronger) is definitely possible.

Even a mountain-building eruption, however, is likely to be rife with explosive phases, especially toward the beginning as it would 'clear the pipes.' Mount Rainier erupted as many as 6 times in the 1800s, but -- aside from tremors -- was quiet throughout the 20th century and, thus far, the 21st century. European explorers and settlers documented very noticeable volcanic plumes from Rainier during the 1800s.

Relative to Mount St. Helens, Rainier is an older and taller mountain (and has more glacial volume and mass than St. Helens did even prior to its 1980 eruption), and many more people live within range of Rainier and the rivers that flow from its glaciers (susceptible to lahars and pyroclastic flows) than St. Helens.

It is generally not believed that an eruption from Mount Rainier -- as with any Cascade volcano -- would not be as smooth and quiet as some of Hawaii's volcanoes, but there do seem to be more mountain-building eruptions (adding lava) than mountain-destroying eruptions (destroying the cone and leaving a crater).

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15y ago

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