The 2017 Jiuzhaigou earthquake occurred on 8 August 2017, in Zhangzha Town, Jiuzhaigou County, Ngawa Prefecture, Sichuan Province, China. The earthquake was registered at 7.0 and killed 29 people in the mountainous region of northern Sichuan.

Earthquake

The earthquake struck at 21:19:46 China Standard Time (CST, UTC+8) on 8 August 2017 in Zhangzha Town in Jiuzhaigou County () with magnitude 7.0. Cities as far away as Lanzhou, Chengdu and Xi'an felt the quake. The epicenter was 39 kilometres from the county seat of Jiuzhaigou County, 66 kilometres from Songpan County, 83 kilometres from Zhouqu County, 90 kilometres from Zoigê County, 105 kilometres from Longnan City, and 285 kilometres from Chengdu City.

Setting Northern Sichuan lies in an area with high tectonic activity. In this region, the Tibetan Plateau abuts against the Yangtze plate with immense pressure forming faults along the edges. Jiuzhaigou County is located in the Min Mountains, a range that was formed at the intersection of these faults. The devastating 1879 Gansu earthquake had its epicenter approximately to the east of where the 2017 Jiuzhaigou earthquake occurred. The mountainous areas to the south of Jiuzhaigou County were the epicenter of the 2008 Sichuan earthquake that resulted in tens of thousands of fatalities.

The Jiuzhaigou earthquake did not correlate with any of the known active faults. Field investigation and remote sensing of the surface effects of the earthquake (surface rupture, landslides) permitted the identification of a previously unknown active fault segment.

Impacts According an isoseismal map produced by the China Earthquake Administration, the seismic intensity could be higher than level IX, and the earthquake epicentre in Zhangzha County could reach level VIII.

The earthquake triggered at least 1,883 landslides, most of which were shallow rock slides, debris slides and rock falls that occurred close to the road network.

After the earthquake, the entire Jiuzhaigou County completely suffered a power failure. The eyewitnesses found that some buildings had fallen off in Jiuzhaigou Valley Scenic and Historic Interest Area. The staff of the Jiuzhaigou Valley Scenic and Historic Interest Area told the correspondent from Xinhua News Agency that in the fourth ditch of the Jiuzhaigou Valley Scenic and Historic Interest Area a house had collapsed and cracked, and the locals were stepping up to evacuate people.

Rescue The China Earthquake Administration put up a Level I reaction, changing to Level II afterwards, and sent troops to the earthquake area for rescue. At 21:26 CST (UTC+8), Health and Family Planning Commission of Sichuan Province started an emergency plan, and the medical rescue team was going to head to the earthquake area within one hour. The Red Cross Society of China, Sichuan Branch was on emergency standby, preparing for rescue. Early the following day, China's State Council Earthquake relief headquarters established national level II earthquake emergency response.

At 06:20 CST on 9 August, a Shuajingsi Town (刷经寺镇) militia vehicle collided with a Sichuan F (Deyang) coach in Hongyuan County, Ngawa Prefecture. Three people from the coach were injured.

By 9 August 2017, there were 40 people critically injured, seven of whom were transferred to other hospitals, four to West China Hospital of Sichuan University, and the rest to Jiuzhaigou County Hospital and Zhongzang Hospital.

Casualties The Emergency Management Office of the Ngawa Prefecture, Sichuan Province announced on 13:10 CST on 9 August, the 7.0-magnitude earthquake in Zhangzha Town in Jiuzhaigou County killed 19 people and injured 247 people, including 40 people critically injured. The following day, the death toll rose to 20 with over 400 injured. Deaths and injuries mainly occurred in Zhangzha Town in Jiuzhaigou County.

CST date and timeFatalitiesInjuriesSourcesReferencesCritical injuriesMinor injuriesTotal injuries2017-08-08 21:19:46 (main tremor occurred)China Earthquake Networks Center(中国地震台网)2017-08-08 23:39144Chengdu Tourism Administration(成都市旅游局)2017-08-08 23:58563Emergency Management Office of the Jiuzhaigou County(九寨沟县应急办)2017-08-09 02:08588China Central Television(中国中央电视台)2017-08-09 04:00932103135Information Office of Ngawa Prefecture Government(阿坝州政府新闻办)2017-08-09 05:009164Emergency Management Office of Ngawa Prefecture Government(阿坝州人民政府应急管理办公室)2017-08-09 08:1012Ngawa Weibo(阿坝微博)2017-08-09 08:581228147175People's Daily(人民日报)2017-08-09 09:3013175Information Office of Sichuan Province Government(四川省政府新闻办)2017-08-09 13:101940207247Emergency Management Office of Ngawa Prefecture Government(阿坝州人民政府应急管理办公室)2017-08-10 12:002018413431Emergency Management Office of the Jiuzhaigou County(九寨沟县应急办)2017-08-11 19:002345448493Emergency Management Office of Ngawa Prefecture Government(阿坝州人民政府应急管理办公室)*All the times are reporting times, so the reported casualties might possibly be different from the actual casualties.

Aftershocks

As of 10 August 2017 10:00 CST (UTC+8), 1,741 aftershocks had occurred, including 30 major ones. Some experts predicted that the aftershocks might reach a magnitude of six after several days. The major aftershocks reported by China Earthquake Networks Center are listed below:

+ List of aftershocks # CST date and time Epicentre Depth magnitude Sources Coordinate Place Main 2017-08-08 21:19:46 Jiuzhaigou County, Ngawa Prefecture, Sichuan Province, China 20 kilometres 7.0 1 2017-08-08 21:28:55 5 kilometres 3.2 2 2017-08-08 21:41:34 9 kilometres 3.3 3 2017-08-08 23:04:56 5 kilometres 3.2 4 2017-08-08 23:49:18 9 kilometres 3.0 5 2017-08-08 23:51:12 10 kilometres 3.1 6 2017-08-09 00:35:17 20 kilometres 3.2 7 2017-08-09 03:59:09 10 kilometres 3.0 8 2017-08-09 05:16:02 10 kilometres 3.6 9 2017-08-09 05:37:14 17 kilometres 3.6 10 2017-08-09 05:41:09 10 kilometres 3.3 11 2017-08-09 06:24:49 18 kilometres 3.0 12 2017-08-09 06:49:03 18 kilometres 3.2 13 2017-08-09 06:49:31 13 kilometres 3.3 14 2017-08-09 08:10:09 23 kilometres 3.7 15 2017-08-09 08:29:04 13 kilometres 3.9 16 2017-08-09 09:22:14 19 kilometres 3.8 17 2017-08-09 09:32:47 19 kilometres 3.7 18 2017-08-09 10:17:02 26 kilometres 4.8 19 2017-08-09 14:41:00 Heishui County, Ngawa Prefecture, Sichuan Province, China 18 kilometres 2.9 20 2017-08-09 20:03:03 Jiuzhaigou County, Ngawa Prefecture, Sichuan Province, China24 kilometres 3.1 21 2017-08-10 02:30:50 26 kilometres 3.1 22 2017-08-10 03:02:13 19 kilometres 3.7 23 2017-08-10 03:06:09 24 kilometres 3.0 24 2017-08-10 05:05:54 26 kilometres 4.3 25 2017-08-10 09:54:02 27 kilometres 3.2 26 2017-08-10 15:30:09 26 kilometres 2.8 27 2017-08-10 17:38:31 19 kilometres 3.0 28 2017-08-10 17:48:34 26 kilometres 4.1 29 2017-08-11 08:05:09 25 kilometres 3.0 30 2017-08-11 19:26:21 26 kilometres 3.4

See also List of earthquakes in 2017 List of earthquakes in China List of earthquakes in Sichuan 2008 Sichuan earthquake 2010 Yushu earthquake 2013 Dingxi earthquakes 2014 Ludian earthquake

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