Aurora like clouds filmed 10 mins before Chinese quake
tags:Bizarre glowing cloud phenomenon in the sky was observed about 10 mins before the May 12, 2008 Sichuan earthquake took place. This was recorded in Meixian, Shaanxi province ~550km northeast of epicenter. The phenomenon was said to last for about 1 min.








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http://www.videosift.com/video/Strange-clouds-in-sky-30-min-before-Chinese-Quake
http://en.wikipedia.org/wiki/1976_Tangshan_earthquake
I remember talking with an old professor one early evening and as the sun was setting there were two 'sun dogs' on each side, so I pointed them out to him and was surprised to learn that this 65 year old dude had never seen something like that before. Interesting how one person can miss something another thought was so common.
http://en.wikipedia.org/wiki/Parhelion
http://en.wikipedia.org/wiki/Earthquake_light
All of the photographs and videos of purported earthquake lights show a glow on the horizon which is visible at night(and which would likely be invisible in daylight). Quite different from a circumhorizontal arc. Here's a citation link from the Wikipedia article, which has a collection of videos and stills. To me these seem pretty unconvincing, and I would guess what's shown in the the urban videos are caused by power surges.
http://inamidst.com/lights/earthquake
Another thing you shouldn't confuse this with is what's called "earthquake clouds". That's a term used by people who claim to be able to predict earthquakes weeks in advance by observing the shape of clouds.
http://en.wikipedia.org/wiki/Earthquake_cloud
As for the idea that circumhorizontal arcs can predict earthquakes. . . I guess it would need to happen more then once.
I'll stick with Atara's explanation until then.