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4

There is a very close real-life example. The climactic eruption of Mt. Mazama that created Oregon's Crater Lake (which perhaps coincidentally contains Wizard Island) ejected an estimated 12-14 cubic miles of material: https://en.wikipedia.org/wiki/Mount_Mazama#Climactic_eruption The distribution of that material is well-mapped - the layer is even used to ...


5

First you have a problem 50 miles off the coast is solidly on oceanic crust. volcanoes that pop out of the oceanic crust are not releasing a lot of ash, As oceanic crust is mostly basalt so is the laval. thus they tend toward basaltic lava type volcanoes instead. You need a more rhyolitic composition to get a lot of ash. This means you are going to need to ...


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