At 8:36 on May 20, an earthquake of magnitude 4.8 occurred in Hanyuan County, Ya’an, Sichuan. At around 11 a.m. that day, a video of “colorful clouds appearing over Tianquan County” was circulated on the Internet. According to the content of the video, a colorful cloud layer appeared near a cloudless sky. Once the video was released, netizens speculated whether it was related to the earthquake. At about 15:00 that day, a staff member of the Ya’an Meteorological Bureau said: “From an atmospheric point of view, the phenomenon of colorful clouds is similar to that of rainbows. It occurs after the atmospheric decomposition of sunlight produces refraction and reflection.” In an interview with the media, Sun Shihong, a researcher at the Internet Center, pointed out that the earthquake was a strong aftershock of the 2013 Ya’an earthquake of magnitude 7. Zou Wenwei, deputy secretary-general of the China Disaster Prevention Association, said that earthquakes belong to geological activities, and the cycle of geological activities is generally very long, which cannot be measured by the cycle standard of human activities. “After a large earthquake occurs, the original stress balance of the geological unit is broken. To establish a new balance, the rock layer must be adjusted many times. The main form of adjustment is earthquakes, that is, aftershocks, which generally last for several months, years, or even longer.
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