[MarkusQ]

That suggests a possibly better strategy (though very long term): pepper the portion of the landscape believed to be safe with "it is safe to build here" monoliths, each as stable as a typical building, and over time only the ones that speak truly will remain.

Would work for volcanoes and earthquakes as well.

[penneyd]

They just do the same thing with regular homes :)

[MarkusQ]

Sadly, that's at least partially true. But rebuilding on a sight where a home was destroyed eliminates the information value (that this site isn't safe from tsunami) and the coverage is far from uniform/regular (so you can't tell if there are no buildings in an area because it was previously undeveloped or is unsafe).

[lostlogin]

‘How old are these buildings?’ would be wise to consider.

This probably works for a variety of things and in many places.

[hinkley]

Japan has a bad habit of considering buildings as disposable. Odd that a land with 1000 year old temples knocks down 40 year old houses with zero remorse, but that seems to be the case.

[anitil]

I'm not sure that judgement of calling it 'bad' is warranted. Certainly it's different that western approaches to housing but I'm not sure whether it's better or worse. My understanding of the 1000 year old temples is that they are periodically replaced and rebuilt, like a Ship of Theseus situation

[anigbrowl]

1000 year old temples

Well it depends. Very important shrines are dismantled and rebuilt every 20 years, eg https://japanwoodcraftassociation.com/2020/02/13/traditions-...

There are lots of old houses in use and for sale in Japan, but many people prefer building a new house to renovating or maintaining an old one - partly for practical reasons, partly because newer structures are more likely to be earthquake-resilient, partly due to haunting.

[hinkley]

It has been ∞ years since a tsunami washed away this stone.

[dylan604]

It should also include the location of where the stone lived before the tsunami. That would help future archaeologists determine how big the tsunami was

[hinkley]

I suspect after a tsunami not all of the stones would be found again, so that's probably a good idea.