According to Poloniex, as of this post, trade volume for ETC (via BTC) is double that of ETH today. And asking price for ETC is up 140% while ETH is down -8%.
So this fork isn't over - in fact, there's still no guarantee it will succeed; the ETC vs ETH battle has just begun.
It also makes sense that it would be making big gains. It just crashed basically to zero, there's nowhere to go but up.
Neither of these metrics suggest long term viability to me. Although I am surprised it's trading as well as it is. 10% of ETH is pretty good!
There may be another factor involved here; perhaps the 'hive mind' (market) is arriving to a realization...
The really strange thing this week is "Steem", which came out of nowhere a month ago and is now supposedly the #3 cryptocurrency. This appears to be some kind of heavily premined scam.