We are in earthquake country (Oregon), looking at seismic upgrade on our foundation, which is 115 years old and in dubious condition. Are there options for strengthening a dodgy foundation by installing posts all around the perimeter? So maybe digging out every few feet and reinforcing, rather than digging out all around.
It seems to me that in theory this would work. We just want our house to not fall down in an earthquake - having post-earthquake gaps where the old foundations have collapsed isn't a big deal if the new posts are still holding up the house.