Avalanche effect on 16 rounds of SHA-1 hash function (only first 46 bits). One bit has been flipped in the input resulting in many modifications in the lower stages (represented as a diff between the original and flipped-bit SHA-1 rounds, white = swiched bit). Note that the strict avalanche criteria is not complete here as there are more white bits than black ones in the 16th round (the strict criteria says that there is 50% of chance that a bit inversion occurs). The 80 rounds of SHA-1 ensures a proper diffusion.
Dake, via Wikimedia