2017 Jiuzhaigou earthquake

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2017 Jiuzhaigou earthquake
2017年九寨沟地震
China Sichuan rel location map.svg
Bullseye1.png
China edcp relief location map.jpg
Bullseye1.png
UTC  time2017-08-08 13:19:49
ISC  event 610873866
USGS-ANSS ComCat
Local date8 August 2017
Local time21:19:49 CST (UTC+8) (USGS)
Duration15 seconds [1]
Magnitude Ms 7.0 (CENC)
Mw 6.5 (USGS)
Depthabout 20 km (12 mi) (CENC)
9.0 km (5.6 mi) (USGS)
Epicenter 33°11′35″N103°51′18″E / 33.193°N 103.855°E / 33.193; 103.855
Zhangzha Town, Jiuzhaigou County, Ngawa Prefecture, Sichuan Province, China
Areas affected Sichuan Province, Gansu Province and Shaanxi Province
Total damage$500 million USD [2]
Max. intensity CSIS IX [3]
Aftershocks1,741 (including 30 major aftershocks)
Casualties25 dead, 525 injured

The 2017 Jiuzhaigou earthquake occurred on 8 August 2017, in Zhangzha Town, Jiuzhaigou County, Ngawa Prefecture, Sichuan Province, China. The earthquake was registered at Ms 7.0 and killed at least 25 people in the mountainous region of northern Sichuan.[ citation needed ]

Contents

Earthquake

The distribution of the seismic intensity of this earthquake, where the epicentre is labelled with a star (USGS) Intensity-2017Nian Jiu Zhai Gou Di Zhen .jpg
The distribution of the seismic intensity of this earthquake, where the epicentre is labelled with a star (USGS)

The earthquake struck at 21:19:46 China Standard Time (CST, UTC+8) on 8 August 2017 in Zhangzha Town in Jiuzhaigou County ( 33°12′N103°49′E / 33.20°N 103.82°E / 33.20; 103.82 ) with magnitude 7.0. [lower-alpha 1] [lower-alpha 2] [8] Cities as far away as Lanzhou, Chengdu and Xi'an felt the quake. [9] 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. [10]

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. [11] 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 65 km (40 mi) 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. [12]

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. [1]

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. [12]

After the earthquake, the entire Jiuzhaigou County completely suffered a power failure. [13] The eyewitnesses found that some buildings had fallen off in Jiuzhaigou Valley Scenic and Historic Interest Area. [14] 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. [15] At 21:26 CST (UTC+8), Health and Family Planning Commission of Sichuan Province Archived 9 August 2017 at the Wayback Machine started an emergency plan, and the medical rescue team was going to head to the earthquake area within one hour. [16] The Red Cross Society of China, Sichuan Branch [17] was on emergency standby, preparing for rescue. [18] Early the following day, China's State Council Earthquake relief headquarters established national level II earthquake emergency response. [19]

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. [20]

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. [14]

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. [14] The following day, the death toll rose to 20 with over 400 injured. [21] Deaths and injuries mainly occurred in Zhangzha Town in Jiuzhaigou County. [14]

CST date and timeFatalitiesInjuriesSourcesReferences
Critical injuriesMinor injuriesTotal injuries
2017-08-08 21:19:46(main tremor occurred) China Earthquake Networks Center
(中国地震台网)
[22]
2017-08-08 23:39144Chengdu Tourism Administration
(成都市旅游局)
[23]
2017-08-08 23:58563Emergency Management Office of the Jiuzhaigou County
(九寨沟县应急办)
[ citation needed ]
2017-08-09 02:08588 China Central Television
(中国中央电视台)
[24]
2017-08-09 04:00932103135Information Office of Ngawa Prefecture Government
(阿坝州政府新闻办)
[25]
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)
[26]
2017-08-09 08:1012Ngawa Weibo
(阿坝微博)
[27]
2017-08-09 08:581228147175 People's Daily
(人民日报)
[28]
2017-08-09 09:3013175Information Office of Sichuan Province Government
(四川省政府新闻办)
[29]
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)
[14]
2017-08-10 12:002018413431Emergency Management Office of the Jiuzhaigou County
(九寨沟县应急办)
[30]
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)
[31]
*All the times are reporting times, so the reported casualties might possibly be different from the actual casualties.

Aftershocks

Aftershocks of 2017 Jiuzhaigou earthquake 2017 Jiuzhaigou earthquake.svg
Aftershocks of 2017 Jiuzhaigou earthquake

As of 10 August 2017 10:00 CST (UTC+8), 1,741 aftershocks had occurred, including 30 major ones. [1] [32] Some experts predicted that the aftershocks might reach a magnitude of six after several days. [33] The major aftershocks reported by China Earthquake Networks Center are listed below:

See also

Notes

  1. The result from United States Geological Survey was Mw 6.5, with depth 9.0 kilometres [4]
  2. China Earthquake Networks Center automatically reported 6.5 at first, and then formally reported 7.0. [5] [6] [7]

Related Research Articles

<span class="mw-page-title-main">Ngawa Tibetan and Qiang Autonomous Prefecture</span> Autonomous prefecture in Sichuan, China

Ngawa Tibetan and Qiang Autonomous Prefecture, also known as Aba, is an autonomous prefecture of northwestern Sichuan, bordering Gansu to the north and northeast and Qinghai to the northwest. Its seat is in Barkam, and it has an area of 83,201 km2 (32,124 sq mi). The population was 895,200 by 2022.

<span class="mw-page-title-main">Pengzhou</span> County-level city in Sichuan, China

Pengzhou, formerly Peng County or Pengxian, is a county-level city of Sichuan Province, Southwest China, it is under the administration of the prefecture-level city of Chengdu. There is an expressway that connects Pengzhou to Chengdu. It is bordered by the prefecture-level divisions of Deyang to the northeast and the Ngawa Tibetan and Qiang Autonomous Prefecture to the north.

<span class="mw-page-title-main">Wenchuan County</span> County in Sichuan, China

Wenchuan County is a county in Ngawa Tibetan and Qiang Autonomous Prefecture, Sichuan, China.

<span class="mw-page-title-main">Beichuan Qiang Autonomous County</span> Autonomous County in Sichuan, China

Beichuan Qiang Autonomous County is a county under the jurisdiction of Mianyang City in northern Sichuan province, China. It is located in an ethnically diverse mountainous region of Sichuan. Its Chinese name literally means "North" (bei) "River" (chuan). Its new county seat is located at Yongchang after the 2008 Sichuan earthquake.

<span class="mw-page-title-main">2008 Panzhihua earthquake</span>

The 2008 Panzhihua earthquake struck southern Sichuan province, China on August 30 at 16:30:50.5 China Standard Time with a surface wave magnitude of 6.1, or 6.0 Mw. It is also cited as the Renhe-Huili earthquake, especially in SCEA reports and early CEA reports. It was not an aftershock of the Sichuan earthquake that occurred several months prior. With more than 400 aftershocks, it caused over 40 deaths, the collapse of 10,000 homes and damage to other infrastructure in the provinces of Sichuan and Yunnan. The maximum liedu was VIII.

The 2008 Yingjiang earthquakes were a series of major earthquakes ranging from surface wave magnitude (Ms) 4.1 to 5.9 that struck Yingjiang County, Yunnan province, China between August 19 and September 3. It caused 5 deaths, 130 injuries, and RMB 2.7 billion in direct economic damage. USGS put the magnitude of the strongest one to Mw 6.0.

Lüchun County is located in Honghe Hani and Yi Autonomous Prefecture, in the south of Yunnan province, China, bordering Vietnam's Lai Châu Province to the south.

<span class="mw-page-title-main">Jiuzhaigou County</span> County in Sichuan, China

Jiuzhaigou County is a county of Sichuan Province, China. It is under the administration of the Ngawa Tibetan and Qiang Autonomous Prefecture. Formerly called Nanping County, it was renamed in 1998 to reflect the fact that the Jiuzhaigou Valley is located within its administration. The county seat, Nanping, was created in 2013 by the merger of Yongle Town (永乐镇), Yongfeng Township (永丰乡), and Anle Township (安乐乡).

On 7 September 2012, a series of earthquakes occurred in Yiliang County, Zhaotong, Yunnan. The two main shocks occurred at 11:19 and 12:16 China Standard Time. The earthquakes left 81 people dead and 821 injured. According to the officials, at least 100,000 people were evacuated and more than 20,000 houses were damaged.

<span class="mw-page-title-main">2013 Lushan earthquake</span> Earthquake in Sichuan, China

The Lushan earthquake or Ya'an earthquake occurred at 08:02 Beijing Time on April 20, 2013. The epicenter was located in Lushan County, Ya'an, Sichuan, about 116 km (72 mi) from Chengdu along the Longmenshan Fault in the same province heavily impacted by the 2008 Sichuan earthquake. The magnitude of the earthquake was placed at Ms 7.0 by China Earthquake Data Center, Ms 7.0 by Russian Academy of Sciences, Mw 7.0 by Geoscience Australia, Mw 6.6 by the United States Geological Survey (USGS), Mw 6.6 by the European Alert System (EMSC) and Mj 6.9 by the Japan Meteorological Agency (JMA). 1,815 aftershocks have been recorded as of 00:00 (UTC+8h) April 22.

<span class="mw-page-title-main">2014 Kangding earthquake</span> Earthquake in China

The 2014 Kangding earthquake struck Kangding County, Garzê Tibetan Autonomous Prefecture, Sichuan, China, with a moment magnitude of 5.9 on 22 November. The earthquake killed five and injured 54 people.

<span class="mw-page-title-main">2017 Jinghe earthquake</span>

The 2017 Jinghe earthquake occurred at 07:27 China Standard Time on 9 August 2017, in Jinghe County, Bortala Mongol Autonomous Prefecture, Xinjiang Uyghur Autonomous Region, China, with magnitude 6.6 and depth 11 kilometres. The epicentre was 44.27°N 82.89°E. Most cities in northern Xinjiang felt the quake. This earthquake occurred on the Tian Shan seismic zone. There was no direct relationship to the earthquake in Jiuzhaigou County that occurred the previous day.

Zhangzha, formerly Jiuzhaigou, is a township-level division under Jiuzhaigou County, Ngawa Tibetan and Qiang Autonomous Prefecture, Sichuan Province, China, with an area of 1,348.41 square kilometres (520.62 sq mi), and a permanent population of 13,593 as of 2020.

The 2021 Luxian earthquake was a damaging seismic event occurring in the early hours of September 16 at 04:33 China Standard Time. The surface wave magnitude (Ms ) 6.0 or moment magnitude (Mw ) 5.4 earthquake struck at a shallow depth of 7.5 km and severe shaking in an area of 4,000 square kilometers was assigned a maximum intensity of VIII on the China seismic intensity scale. Three people were killed and 146 injured when the earthquake struck Lu County, Luzhou, Sichuan Province. At least 36,800 buildings were affected, 7,800 of them seriously damaged or completely destroyed, causing about a quarter of a billion dollars worth of damage.

<span class="mw-page-title-main">2022 Ya'an earthquake</span> Earthquake in Sichuan Province, China

On June 1, 2022, a moment magnitude (Mw ) 5.8 or surface-wave magnitude (Ms ) 6.1 earthquake struck Lushan County in Ya'an, Sichuan Province, China. At least four people were killed and 42 were injured. The earthquake had a maximum intensity of VIII on the China seismic intensity scale, causing damage to many homes and triggering rockslides.

<span class="mw-page-title-main">2022 Luding earthquake</span> Earthquake in China

A Mw 6.7 earthquake struck Luding County in Sichuan province, China on 5 September 2022 at 12:52:19 local time. The epicenter was located 226 km (140 mi) from Chengdu, or 43 km (27 mi) southeast of Kangding. Ninety-three people died, 424 were injured and 24 remained missing. More than 13,000 homes and other infrastructure were damaged or destroyed. It was the largest earthquake to strike the province since 2017.

<span class="mw-page-title-main">2019 Zigong earthquake</span> The earthquake that occurred in Zigong City, China at 13:00 on February 25, 2019.

The 2019 Zigong earthquake occurred in Zigong, Sichuan Province, China, at about 13:00 on February 25, 2019. The epicentre was located in Rongxian County, with a magnitude of Ms 4.9, a focal depth of about 5 km and a maximum intensity of VI. The earthquake killed two people and injured 12 others.

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