I found a nice cedar wooden rack for cheap on eBay from a guy in Oregon called HowardHaroldHelm. They're well-priced and well-made.
But the racks are still not earthquake proof. So, I looked around for existing solutions. Well.. you could spend $2.50 per bottle of wine on a QuakeGuardian (trademarked and patented, thank you), which seems a bit much to me, and besides, takes a significant amount of time to install. This one was pretty inspirational - but it requires zip-typing each o-ring to the wood, which is fiddly, and I felt it would look pretty ugly. I think we can do better. And news articles on the topic aren't much help either.
Here's my solution: it's quick, it's easy, it looks fine, and it's cheap.