1718 Tongwei–Gansu earthquake
| Local date | June 19, 1718 |
|---|---|
| Magnitude | 7.5 Ms 7.5 Mw |
| Epicenter | 35°00′N 105°12′E / 35.0°N 105.2°E |
| Areas affected | Qing dynasty |
| Max. intensity | MMI X (Extreme) |
| Landslides | >300 |
| Foreshocks | Yes |
| Casualties | ≈73,000 dead |
An earthquake occurred on June 19, 1718, in Tongwei County, Gansu Province, Qing dynasty, present-day China. The estimated surface wave magnitude (Ms ) 7.5 earthquake was designated a maximum Modified Mercalli intensity of X (Extreme), causing tremendous damage and killing 73,000 people.