I'm in the inland northwest of the US near Spokane, Washington. No major seismic concerns. Unless you build near rivers, flooding isn't a worry. Frost depth is 18-24" typically. Snow loads on the roof are a real concern, as is wind, but no hurricanes or tornadoes.
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that's fascinating! I never designed anything for snow load, or frost.
Please keep this content series alive, I really enjoy studying these blueprints.