[jyl]

My cavalier view - I would not be that concerned about earthquake damage, because it is not an inhabited structure. The odds of people standing on the deck during a big earthquake are very low, the odds of people being under the deck at that time are pretty nil. And after the big earthquake, a damaged or collapsed pool deck will probably be the least of Wayne's worries.

To me, the main thing is for the structure to hold up to people running, dancing, jumping, partying, etc.

If needed, seems you could have steel brackets made to support the ends of the beams on the lip of the pool. Sort of like big joist hangers, in concept. That way, the downward force would be distributed to the concrete lip, not all on the posts/footings. Also stabilizes deck horizontally. Probably something you could do after the deck is built, if necessary.