Well, the volcano idea is impractical;- as I live on it LOL. I was evacuated four times in 2018 before finally just staying at my business location for the last 2 months of the flow.
Over here if that happened, you would be told no insurance if you build on that same land - mostly used for earthquake and flood prone areas.
Good luck with your build. Best advice I can give is make sure you have adequate ventilation - or good air flow. Humidity will hurt your tools, projects, parts and be unpleasant to work in.