If I look at the network hash rate and compare it to the summation of a bunch of the top pools (http://bitcoinchain.com/pools) the numbers do not compute. The hast rate is sitting at 30000 Th/s but the pools only account for maybe 2000 Th/s.

https://blockchain.info/charts/hash-rate

In addition it looks like the hash rate went from 10000 Th/s to 29000 Th/s in one month. Where is all this hashing? Who is running the systems? Where are the ASICs coming from?

Does anyone have some insight into this?