They head south for the winter...
If they do move at all I doubt enough to be noticed...
Pounded 4" today of frozen ground with my Samson for a lone memorial.
Here, our frostline is 42". That's minimum depth for code on footings and such. Burried waterlines are all @ 4ft to keep from freezing. In the spring, all the fields around here sprout rocks like we grow 'em. Even the surface swells. I need to adjust/raise my slider door on my barn because it's dragging now.I doubt they move at all unless they're shallow. Even when we get deep freezes like we are now in MA, the ground only ever freezes 4-5 inches most. It's still soft dirt below the 6 inch mark where most of our silver is.
heres a good exsample for you a park i been hunting for 2 years now that has history on it from the 1600s has had almost 2 feet of dirt added to it in the late 1960s im pulling reales and 1800s coins at 5 to 9 inchs so does things move around over the years i really do beleave it i got spots iv cleaned signals completly out in the spring and now its full of signals again so do i beleave the scientific's of ground movement and material movements in the earth for small objects YEP
Pounded 4" today of frozen ground with my Samson for a lone memorial.