2017 Jiuzhaigou earthquake

2017 Jiuzhaigou earthquake
2017年九寨沟地震
2017 Jiuzhaigou earthquake is located in Sichuan
2017 Jiuzhaigou earthquake
2017 Jiuzhaigou earthquake is located in China
2017 Jiuzhaigou earthquake
UTC time2017-08-08 13:19:49
ISC event610873866
USGS-ANSSComCat
Local date8 August 2017
Local time21:19:49 CST (UTC+8) (USGS)
Duration15 seconds[1]
MagnitudeMs 7.0 (CENC)
Mw 6.5 (USGS)
Depthabout 20 km (12 mi) (CENC)
9.0 km (5.6 mi) (USGS)
Epicenter33°11′35″N 103°51′18″E / 33.193°N 103.855°E / 33.193; 103.855
Zhangzha Town, Jiuzhaigou County, Ngawa Prefecture, Sichuan Province, China
Areas affectedSichuan Province, Gansu Province and Shaanxi Province
Total damage$500 million USD[2]
Max. intensityCSIS 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]

Earthquake

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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′N 103°49′E / 33.20°N 103.82°E / 33.20; 103.82) with magnitude 7.0.[a][b][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

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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

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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

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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

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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 time Fatalities Injuries Sources References
Critical injuries Minor injuries Total injuries
2017-08-08 21:19:46 (main tremor occurred) China Earthquake Networks Center
(中国地震台网) 		[22]
2017-08-08 23:39 1 4 4 Chengdu Tourism Administration
(成都市旅游局) 		[23]
2017-08-08 23:58 5 63 Emergency Management Office of the Jiuzhaigou County
(九寨沟县应急办) 		[citation needed]
2017-08-09 02:08 5 88 China Central Television
(中国中央电视台) 		[24]
2017-08-09 04:00 9 32 103 135 Information Office of Ngawa Prefecture Government
(阿坝州政府新闻办) 		[25]
2017-08-09 05:00 9 164 Emergency Management Office of Ngawa Prefecture Government
(阿坝州人民政府应急管理办公室) 		[26]
2017-08-09 08:10 12 Ngawa Weibo
(阿坝微博) 		[27]
2017-08-09 08:58 12 28 147 175 People's Daily
(人民日报) 		[28]
2017-08-09 09:30 13 175 Information Office of Sichuan Province Government
(四川省政府新闻办) 		[29]
2017-08-09 13:10 19 40 207 247 Emergency Management Office of Ngawa Prefecture Government
(阿坝州人民政府应急管理办公室) 		[14]
2017-08-10 12:00 20 18 413 431 Emergency Management Office of the Jiuzhaigou County
(九寨沟县应急办) 		[30]
2017-08-11 19:00 23 45 448 493 Emergency 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

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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

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Notes

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  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]

References

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  1. ^ a b c "四川阿坝州九寨沟7.0级地震综合图集". 中国地震信息网. 8 August 2017. Archived from the original on 9 August 2017. Retrieved 9 August 2017.
  2. ^ "Event:SICHUAN, CHINA". National Geophysical Data Center.
  3. ^ "九寨沟MS 7.0地震震源参数及致灾特征初步分析". 地球物理学进展 (in Chinese). 33 (6): 2251–2258. 20 December 2018. doi:10.6038/pg2018BB0536. Retrieved 10 November 2021.
  4. ^ "M 6.5 – 35 km WSW of Yongle, China". United States Geological Survey. 8 August 2017. Archived from the original on 8 August 2017. Retrieved 8 August 2017.
  5. ^ "九寨沟发生6.5级地震 广元震感明显". 四川新闻——四川在线 (in Simplified Chinese). 8 August 2017. Archived from the original on 8 August 2017.
  6. ^ "四川阿坝州九寨沟县附近发生6.5级左右地震". 新浪网 (in Chinese). 8 August 2017. Archived from the original on 8 August 2017. Retrieved 8 August 2017.
  7. ^ "四川阿坝州九寨沟县发生6.5级地震". 凤凰新闻-手机凤凰网 (in Chinese). 8 August 2017. Archived from the original on 11 August 2017. Retrieved 11 August 2017.
  8. ^ "四川阿坝州九寨沟县7.0级地震" (in Chinese (China)). 中国地震台网. 8 August 2017. Archived from the original on 11 August 2017. Retrieved 11 August 2017.
  9. ^ 張心怡 (8 August 2017). "四川九寨溝發生7.0級地震 再有3.5級餘震 西安蘭州等地有震感". 香港01 (in Chinese (Hong Kong)). Archived from the original on 10 August 2018. Retrieved 10 August 2018.
  10. ^ "【一文读懂】九寨沟地震已致25人遇难、525人受伤". 腾讯新闻 (in Chinese (China)). 中国地震台网. 14 August 2017. Archived from the original on 9 August 2017. Retrieved 9 August 2017.
  11. ^ Zhang, Zhongjie; Yuan, Xiaohui; Chen, Yun; Tian, Xiaobo; Kind, Rainier; Li, Xueqing; Teng, Jiwen (April 2010). "Seismic signature of the collision between the east Tibetan escape flow and the Sichuan Basin". Earth and Planetary Science Letters. 292 (3–4): 254–264. Bibcode:2010E&PSL.292..254Z. doi:10.1016/j.epsl.2010.01.046.
  12. ^ a b Fan, Xuanmei; Scaringi, Gianvito; Xu, Qiang; Zhan, Weiwei; Dai, Lanxin; Li, Yusheng; Pei, Xiangjun; Yang, Qin; Huang, Runqiu (19 February 2018). "Coseismic landslides triggered by the 8th August 2017 Ms 7.0 Jiuzhaigou earthquake (Sichuan, China): factors controlling their spatial distribution and implications for the seismogenic blind fault identification". Landslides. 15 (5): 967–983. Bibcode:2018Lands..15..967F. doi:10.1007/s10346-018-0960-x. S2CID 135442151. Archived from the original on 22 May 2018.
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  23. ^ "成都市旅游局：赴九寨沟旅行团已有1人死亡4人受伤". 成都全搜索新闻网 (in Chinese (China)). 8 August 2017. Archived from the original on 10 August 2017. Retrieved 10 August 2017.
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  27. ^ "九寨沟7.0级地震已造成12人死亡 175人受伤". 中国新闻网 (in Chinese (China)). 9 August 2017. Archived from the original on 30 October 2017. Retrieved 30 October 2017.
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