The last time there was that much of an arbitration opportunity between China and the US the price shot up a few hundred dollars. Right now Japan has the highest trading volume with 5 times more Bitcoins traded each day then the next closest country.
If anyone cares this is the chart site I use.
https://cryptowat.ch/bitfinex/btcusd/15m
Right after I posted this this happened. Bloody Bitcoin.
you broke bitcoin :,(
It took me longer then I thought but it is fixed now.
I am sorry about that. I will fix it, just give me about an hour.