Yunnan, the epicentral region, is one of the more seismically active Chinese provinces. The earliest earthquake recorded there was in the 9th century; however, moderate to strong ones have been observed since the

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The epicenter of the quake was about 121 km (75 mi) southwest of Kunming and 97 km (60 mi) northwest of Gejiu; this area was mainly a tobacco-growing region. Effects of the rupture were felt over an area of 8,781 km (3,390 sq mi). In Hanoi, North Vietnam,

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Scientific study
The earthquake was among the first to be studied over a long term by the Chinese government. More than 40 Chinese seismologists, engineers,

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1. ^ This would cost roughly US$28,194,000 to $140,968,000 in 2008 US$. See Inflation Calculator.

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• Allen, C. R.; A. R. Gillespie; Han Yuan; Kerry E. Sieh; Zhang Buchun; Zhu Chengnan (June 1984). "Red River and associated faults, Yunnan Province, China; Quaternary geology, slip rates, and seismic hazard"

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• Chen, Xiaofei; Li, Zhengbo; Zhang, Zhenguo; Zhang, Wenqiang; Yu, Houyun (2020), "Investigation on the Dynamic Rupture of the 1970 Ms 7.7 Tonghai, Yunnan, China, Earthquake

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• List of earthquakes in 1970
• List of earthquakes in China

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