The other day, Ouyang Ziyuan, the chief scientist of the "Chang'e Project" and an academician of the Chinese Academy of Sciences, expressed in a lecture of "Guangzhou Science & Technology Activity Week" that: "Earthquake is one of the four urgent states which might lead to human extinction. In 4.5 billion years, the interior of Earth will be cooled and consolidated, and there will no longer be geological activities such as earthquakes and volcanoes on the Earth."