How to find the Hash Rate and Network Difficulty in https://etherscan.io/ site?

How to find the Hash Rate and Network Difficulty in https://etherscan.io/ site? When we check the getBlock in geth

eth.getBlock(100)

{

difficulty: 137114,

  extraData: "0xd683..................................7578",

  gasLimit: 3323547,

  gasUsed: 0,

  hash: "0xb........................................5746f",

  logsBloom: "0x00000000......................000",

  miner: "0x..............................892",

  mixHash: "0x7.........................0edf",

  nonce: "0x5..........................3d",

  number: 100,

  parentHash: "0x05b.................................a51",

  receiptsRoot: "0x56e.....................................21",

  sha3Uncles: "0x1dc..................................49347",

  size: 534,

  stateRoot: "0xc6................................e02f680",

  timestamp: 152458668,

  totalDifficulty: 135589669,

  transactions: [],

  transactionsRoot: "0x5.........................................421",

  uncles: []

}

Which all details can I use for calculating the hash rate?