

On May 12, 2008, 30 minutes prior to the Sichuan Earthquake, a cell phone  
captured footage of multi-colored clouds in the sky. The footage was  
uploaded to Youtube
Multi-colored clouds recorded 30 minutes before Sichuan Earthquake
http://www.youtube.com/watch?v=KKMTSDzU1Z4
The precise mechanism, if such a phenomenon exists—as opposed to being  
coincidence with aurora or mistaken recall after a traumatic event such as  
an earthquake—is unknown. One theory suggests that earthquake lights are a  
form of plasma discharge caused by the release of gases from within the  
Earth and are electrically charged in the air.
Another possible explanation is local disruption of the Earth's magnetic  
field and/or ionosphere in the region of tectonic stress, resulting in the  
observed glow effects either from ionospheric radiative recombination at  
lower altitudes and greater atmospheric pressure or as aurora. However,  
the effect is clearly not pronounced or notably observed at all earthquake  
events and is yet to be directly experimentally verified.
Another explanation involves intense electric fields created  
piezoelectrically by tectonic movements of rocks containing quartz.
Some similar clouds have been reported during nuclear tests  and Radon is  
likely to be an earthquake precursor, so another theory is that glowing  
clouds might be light emission produced by Nuclear reactions or ionization  
and plasma-chemical reactions
An earthquake light is an unusual luminous aerial phenomenon, similar in  
appearance to the aurora borealis, that allegedly appears in the sky at or  
near areas of tectonic stress, seismic activity or volcanic eruptions.  
Scientific evidence for the presence of lights is unreliable, given that  
there are few references documenting the phenomenon.
Appearance
The lights are most evident in the middle period of an earthquake,  
although there are reports of lights that occurred after or quite often  
before the earthquake, such as before the 1976 Tangshan earthquake. They  
usually have shapes similar to those of the auroras with white to bluish  
hue, but occasionally they have been reported to have a wider color  
spectrum. The luminosity is typically visible for several seconds, but  
there have been cases in which they lasted tens of minutes. In the 1930  
Idu earthquake, lights were reported up to 70 miles from the epicentre.,  
although most lights are not so far away.
There have also been cases in which electromagnetic waves caused by the  
earthquake interfered with radio transmissions, such as during the Great  
Chilean Earthquake of 1960.
Distinguishing earthquake lights from other transient optical phenomena  
can be difficult during the chaos of a tremor. For example, a bluish-white  
flashes that are accompanied by loud bangs or hissing during an earthquake  
are more likely the result of electrical arcing in power lines or  
transformers. However, in some videos, the light can be seen as a long  
flash in the night high in the sky.
History
Records of earthquakes that were accompanied by lights can be found as far  
back as 373 BC in ancient Greek writings, that "immense columns of flame"  
foretold the earthquake that destroyed the cities of Helike and Boura.  
However, even in the early 20th century they were still considered a myth,  
despite an investigation of lights seen during the 1930 Idu earthquake by  
researchers from Tokyo University, until photographs of actual lights were  
taken in Japan in the 1960s.
The night before the 1976 Tangshan earthquake, many people in Tangshan  
reported seeing strange lights.
In Peru's earthquake that occurred south of Lima on August 15, 2007,  
earthquake lights could be seen across the Lima sky before and during the  
earthquake. Several videos were taken.
On May 12, 2008, 30 minutes prior to the Sichuan Earthquake, a cell phone  
captured footage of multi-colored clouds in the sky. The footage was  
uploaded to Youtube. There is also footage from Meixian, Shaanxi,  
approximately 550km northeast of the epicenter, recorded 10 minutes before  
the earthquake. However, the footage appears to show a circumhorizontal  
arc, which is caused by refraction of the sun's light through ice  
particles in a cirrus cloud, similar to a rainbow. Earthquake lights were  
also spotted in Tianshui, Gansu, approximately 400 km north-northeast of  
the epicenter.
The 2008 Sichuan earthquake (Chinese: 四川大地震), or Great Sichuan  
Earthquake which measured at 8.0 Ms and 8.3 Mw according to PRC's China  
Seismological Bureau, and 7.9 Mw according to USGS, occurred at  
14:28:01.42 CST (06:28:01.42 UTC) on 12 May 2008 in Sichuan province of  
China. It was also known as the Wenchuan earthquake (Chinese: 汶川大地震),  
after the earthquake's epicenter in Wenchuan County in Sichuan province.  
The epicenter was 80 kilometres (50 mi) west-northwest of Chengdu, the  
capital of Sichuan, with a depth of 19 kilometres (12 mi). The earthquake  
was felt as far away as Beijing (1,500 km away) and Shanghai (1,700 km  
away), where office buildings swayed with the tremor. The earthquake was  
also felt in nearby countries.
Official figures (as of May 30, 12:00 CST) state that 68,858 are confirmed  
dead, including 68,349 in Sichuan province, and 366,586 injured, with  
18,618 listed as missing. The earthquake left about 4.8 million people  
homeless, though the number could be as high as 11 million. It was the  
deadliest and strongest earthquake to hit China since the 1976 Tangshan  
earthquake, which killed at least 240,000 people. Approximately 15 million  
people lived in the affected area.
The earthquake was followed by two major aftershocks, which led to the  
collapse of 420,000 more buildings. On May 25, a major aftershock of 6.0  
Mw hit northeast of the original earthquake's epicenter, in Qingchuan  
County, causing eight deaths, 927 injuries, and billions of dollars in  
damage.
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