China is the first country to study earthquakes in the world. How many years ago?

China is the first country to record and study earthquake phenomena. As early as the Warring States period, there were records about earthquakes in the chronicles of Mozi and Zhushu.

In A.D. 132, Tai Shigong of the Eastern Han Dynasty asked Zhang Heng to invent the waiting seismograph, which is the first instrument to observe earthquakes in the world and has a milestone significance in the history of seismology in the world. In the Ming and Qing Dynasties, the records of earthquakes were more comprehensive, detailed and rich, and the causes and predictions of earthquakes were also explored.