I have seen exactly the same clouds on several occasions usually as the sun sets, they are similar to rainbows by in cloud vapor... no link to earthquakes I'm afraid. I suppose that it is still possible that the earthquake is natures way of bringing down rigid human egoic structures such as Communist China, in order to pave the way for a shift in human consciousness.

Who would have believed that the former Soviet Union would have collapsed in the way it did, it has been said that the most rigid egoic belief systems will collapse from the inside out to bring about Unity consciousness... you'll have to forgive me but I have just seen 'The Happening'.