Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The 1970 Tonghai earthquake occurred on 4 January 1970 in Tonghai, China. The rupture originated on the local Yunnan Province''s Red River fault, which had not experienced an earthquake above magnitude 7 since 1700. The earthquake had a magnitude of 7.7 and killed at least 15,000 people, making it one of the deadliest in the history of China. The tremor caused between US$5 to $25 million in damage, felt over an area of 8,781 km (5,456 miles). In Hanoi, North Vietnam, almost 483 km (300 miles) from the epicenter, victims left their homes as the rupture rumbled through the city.