How did Chinese people predict earthquakes? - Ancient China answers questions
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Chinese Seismograph

Chinese seismograph
Chinese seismograph (132 AD)
(thanks to National Geographic)

Earthquakes are a big problem in China, where there are many earthquakes, and often strong ones. Under the Han Dynasty, a man called Zhang Heng invented the first seismograph in the world - the first way to record an earthquake.

Zhang Heng's seismograph was a bronze jar about three feet across, with eight small dragons perched on it. Each dragon had a ball balanced in his mouth. When there was an earthquake, the closest dragon's mouth would open, letting the ball drop into the mouth of a waiting frog. This showed what direction the earthquake was coming from. Zhang Heng's seismograph could tell what direction an earthquake was coming from up to 500 kilometers (310 miles) away.

Learn by Doing - Making a Seismograph

Bibliography and further reading about Chinese science:

Science in Ancient China

Science in Ancient China, by George Beshore (1998). .

The Joy of Pi, by David Blatner (1999). It's not all about ancient China, but some of it is. For teenagers.

Ancient China: 2,000 Years of Mystery and Adventure to Unlock and Discover (Treasure Chest), by Chao-Hui Jenny Liu (1996). Lots of activities , including a Chinese calligraphy set.

Zero: The Biography of a Dangerous Idea, by Charles Seife and Matt Zimet (2000).

Chinese mathematics
Chinese astronomy
Ancient China

Professor Carr

Karen Eva Carr, PhD.
Assoc. Professor Emerita, History
Portland State University

Professor Carr holds a B.A. with high honors from Cornell University in classics and archaeology, and her M.A. and PhD. from the University of Michigan in Classical Art and Archaeology. She has excavated in Scotland, Cyprus, Greece, Israel, and Tunisia, and she has been teaching history to university students for a very long time.

Professor Carr's PSU page

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