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'.

If I were writing a Tom Clancy type novel, I might speculate that the Eastern Illuminati has released water fuel technology in retaliation for the China quake.

Water fuel vehicle unveiled in Japan
uk.reuters.com...

Fulford and Haarp
www.youtube.com...

You would be looking for the term "Iridescent" cloud however in this case it is also an "Earthquake" cloud...

Here is an "Iridescent" cloud


Here is the work on "Earthquake" clouds from Z. Shou...
Bam Earthquake Prediction & Space Technology - PDF

Now while I know HAARP CAN make earthquakes... they did not do this one...

But China building their biggest underground nuclear weapons facility on a know fault line that has a history of BIG quakes... seems kinda stupid to me...