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2013 Dingxi earthquakes
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 .〔 It was measured at Mw 5.9 by the United States Geological Survey (USGS)〔(【引用サイトリンク】title=M5.9 - 13km E of Chabu, China (BETA) )〕 and Mw 6.0 by the European Alert System.〔(【引用サイトリンク】title=M 6.0 - GANSU, CHINA - 2013-07-21 23:45:57 UTC )〕 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.〔
==Background==
The tremor occurred less than from the Lintan-Dangchang fault line ((中国語:临潭-宕昌断裂带)). Since recorded history 25 earthquakes of more than 5.0 magnitude have occurred within a 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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