Ok......... I am extremely skeptical that a nuclear war..... even a total annihilation scenario would cause volcanoes to erupt.
However, I could be persuaded that the 25 Megaton ground bursts in multiple locations around Puget Sound could maybe (just maybe) set off a Cascadia earthquake event. A Cascadia earthquake would mean devastating ground shock and fallen building everywhere not just the nuke impact areas.
As near as Mt Ranier is to Puget Sound, then I could understand the eruption.... Not going with the wholesale eruption of the "Ring of Fire" though and reducing the scale of the ashfall considerably.
Seattle...... with 3 to 20 feet of ash? No. There could and would be a really nasty mud flow into Seattle but, wind direction is west to east.
Ash yes, probably six inches to three feet in any way I run this scenario.
Already this means mass death by silicosis and not a single functioning air breathing motor anywhere.
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