Gosh Sue
[?] I can't believe you hadn't thought about this
Hope you've got a guarantee from your builder that he has built to Earthquake regulations and that you have earthquake insurance set up and ready.....just in case.
If the pool starts rippling and there is no-one in it, it a good indication that the plates are having a little jiggle ! And when you get out of bed and you feel all weird and off balance, it isn't always down the the Raki you consumed the night before