"People had this crucial knowledge, but they were busy with their lives and jobs, and many forgot," said Yotaru Hatamura, a scholar who has studied the tablets.
One stone marker warned of the danger in the coastal city of Kesennuma: "Always be prepared for unexpected tsunamis. Choose life over your possessions and valuables."
This is why the Native Americans say to remember ones ancestors.
"High dwellings are the peace and harmony of our descendants," the stone slab reads. "Remember the calamity of the great tsunamis. Do not build any homes below this point."
See the whole story at the link above and I believe this was very good advice if only everybody had remembered the Stones.