That fancy world map is just a graph of the 1149 nodes that the blockchain.info client is connected to, and then it charts the number of incoming transactions that get relayed by that node first. It's not a map of hashrate or even blocks found, it's a map of the largest bitcoind nodes that they happen to be monitoring.

This came up months ago, and it was proven to be nothing but the fact that EMC is physically located right in that same area. Herpy-durp!