Map of the Cascadia Volcanic Arc by NASA. Image courtesy Wikipedia Commons.
Prelude To A Catastrophe: “One Of The Most Active And Most Explosive Volcanoes In The Cascade Range” -- Scientific American
Imagine being an extraterrestrial geologist in geostationary orbit above the Pacific Northwest in the 1970s. You’re the first explorers to reach Earth (underpants-thieving aliens aside), and you haven’t got a lot of data on this little blue marble. But your own planet has plate tectonics, so you’re familiar with the landforms caused by the process.
You have a look through your sensors, and see a conga line of volcanoes weaving up the continent.
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My Comment: These volcanoes will blow one day .... let us hope that it will not be today.