2013 Dingxi earthquakes
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| Date | 22 July 2013 |
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| Origin time | 7:45 UTC+8 |
| Magnitude |
Ms 6.6 (CENC) Mw 5.9 (USGS) Mw 6.0 (EMSC) |
| Depth | 20 kilometres (12 mi) |
| Epicenter | 34°30′N 104°12′E / 34.5°N 104.2°ECoordinates: 34°30′N 104°12′E / 34.5°N 104.2°E |
| Areas affected | China |
| Casualties | 95 dead, 2,395 injured (as of 25 July 2013) |
| Dingxi earthquakes | |||||||
| Traditional Chinese | 定西地震 | ||||||
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| Simplified Chinese | 定西地震 | ||||||
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| Transcriptions | |
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| Standard Mandarin | |
| Hanyu Pinyin | Dìngxī Dìzhèn |
On 22 July 2013, a series of earthquakes occurred in Dingxi, Gansu. The first quake struck at 07:45 China Standard Time with the epicenter located at the border of Min County and Zhang County. The magnitude of the initial earthquake was placed at Ms 6.6 by the China Earthquake Data Center with a focal depth of 20.0 kilometres (12 mi). It was measured at Mw 5.9 by the United States Geological Survey (USGS) and Mw 6.0 by the European Alert System. Another strong quake occurred about one hour later, measured at 5.6 magnitude by the USGS. As of 18:00 CST (10:00 UTC), 22 July 2013, 422 aftershocks had been recorded. The earthquakes were also felt in the nearby cities of Tianshui and Lanzhou in Gansu, as well as Xi'an, Baoji, and Xianyang in neighbouring Shaanxi.
As of 23:00 CST, 23 July 2013, the earthquakes had caused at least 95 deaths, and more than 1000 people had been injured.
The tremor occurred less than 14 kilometres (9 mi) from the Lintan-Dangchang fault line (Chinese: 临潭-宕昌断裂带). Since recorded history 25 earthquakes of more than 5.0 magnitude have occurred within a 200 kilometres (124 mi) radius from the current epicenter, the earliest being the 193 BC Lintao earthquake which measured at 6.5 magnitude, while the strongest was the 8.0-magnitude 1654 Tianshui earthquake.
Most of the casualties occurred in Min County, located 15 kilometres (9 mi) from the epicenter, which reported 87 deaths.
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