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An earthquake light is an unusual luminous aerial phenomenon that reportedly appears in the sky at or near areas of tectonic stress, seismic activity, or volcanic eruptions. ==Appearance== The lights are reported to appear while an earthquake is occurring, although there are reports of lights before or after earthquakes, such as reports concerning the 1975 Kalapana earthquake. They are reported to have shapes similar to those of the auroras, with a white to bluish hue, but occasionally they have been reported having a wider color spectrum. The luminosity is reported to be visible for several seconds, but has also been reported to last for tens of minutes. Accounts of viewable distance from the epicenter varies: in the 1930 Idu earthquake, lights were reported up to from the epicenter.〔Lane, F. W. ''The Elements Rage'' (David & Charles 1966), pp. 175–6〕 Earthquake lights were reportedly spotted in Tianshui, Gansu, approximately north-northeast of the 2008 Sichuan earthquake's epicenter. During the 2007 Peru earthquake lights were seen in the skies above the sea and filmed by many people . The phenomenon was also observed and caught on film during the 2009 L'Aquila and the 2010 Chile earthquakes. Video footage has also recorded this happening during the 9 April 2011 eruption of Sakurajima Volcano, Japan . The phenomenon was also reported around the Amuri Earthquake in New Zealand, that occurred 1 September 1888. The lights were visible in the morning of 1 September in Reefton, and again on 8 September. A more recent appearance of the phenomenon, along with video footage of the incident, happened in Sonoma County of California on August 24, 2014. Appearances of the earthquake light seem to occur when the quakes have a high magnitude, generally 5 or higher on the Richter scale.〔 There have also been incidents of yellow, ball-shaped lights appearing before earthquakes. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「earthquake light」の詳細全文を読む スポンサード リンク
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