Put one or more shipping containers (depending on your need) side by side alternating ends, bolted/welded together with connecting passage ways. Put this on top of a square flat bottom concrete steel reinforced slab shaped to look like a symmetrical flat bottom boat. The slab would be square, and stick out well beyond the container(s). All outer edges of the slab would have a taper of say 30 or 45 degree angle like the front of a flat bottom boat. On the outer edge the slab could extend up above the top surface to form a concrete curb or rail around the perimeter. Drainage slots would be cut in each side to allow water to run off.
This concrete boat would be able to ride the waves of rippling land and survive the liquefaction (soil turning into a liquid) that is likely to occur in many areas. Depending on the ground conditions, this could be built differently. In soil that is not very deep to bed rock, one would not worry about sides and possibly the slab thickness could be less. In places where there is soil and it is very deep to bed rock then the slab should be thicker and sides higher and possibly the slab is a little larger overall. This would have use after the pole shift as a excellent closed water tight storage to keep out the humidity or as continuing housing.
Design considerations: Until one can get a structural engineer to look at it, estimate roughly a 14" thick slab for a bottom over liquefaction and about an 8-10" slab for a bottom close to bed rock. Use lots of large reinforcing rods and wire mesh. Use supports from roof top to slab to make a triangle. Fasten storage units securely to bolts welded to large plates embedded in the concrete. Make sure the slab is done at least 6 months before the pole shift day for maximum strength.
Offered by Mike.