During the Eastern Han Dynasty, earthquakes were frequent. From 92 AD to 139 AD, the capital cities of Luoyang and Longxi experienced a total of 20 earthquakes, of which approximately 6 were destructive. Earthquakes have enormous destructive power, seriously affecting production activities and people’s lives at that time, and also related to the stability of feudal regimes. Therefore, there is an urgent need for an instrument that can observe earthquakes
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