But at number 3 is the volcano about which I feel the most concerned:. Located near the Seattle-Tacoma-Olympia area, it is the largest Cascade volcano and one that we have proof can cause a major impact to this metropolitan area. Sure, Rainier hasn't had a confirmed eruption since ~1450 CE, although there may have been small, unconfirmed puffs during the 1800s. Yet, the danger of Rainier exists whether it is erupting or not.
This thick consistency means that they can take out much of anything in their path, including buildings or bridges. It also means they can fill a valley with tens or hundreds of feet of debris. What is left behind is a landscape that looks like it has been paved.
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