2021 Maduo earthquake


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The 2021 Maduo earthquake struck Maduo County in Qinghai Province, China on the morning of 22 May 2021 at 02:04 local time.[2] The earthquake had a moment magnitude of 7.3 and a surface wave magnitude of 7.4, according to the United States Geological Survey (USGS) and the China Earthquake Administration (CEA) respectively.[3][4] The earthquake caused no deaths but eight people sustained minor injuries.[5] Highway bridges, roads and walls reportedly collapsed as a result of the earthquake.[6]

2021 Maduo earthquake

2021 Maduo earthquake is located in Qinghai

2021 Maduo earthquake

UTC time2021-05-21 18:04:13
USGS-ANSSComCat
Local date22 May 2021
Local time02:04 (China Standard Time)
Magnitude 7.3
7.4
Depth10.0 km (USGS)
17 km (CEA)
EpicenterQinghai, China
Areas affectedChina
Total damageLimited
Max. intensityMMI VIII (Severe)
AftershocksMultiple. Largest is an mb  5.2[1]
Casualties8 injured

Earthquake

According to the USGS, the earthquake occurred as a result of strike-slip faulting with a sense of normal dip-slip component. It had a depth of 10 km or 17 km. Earthquakes of this size are thought to have been caused by rupture on a 90 km by 15 km fault plane.[3]

Experts from the China Earthquake Networks Center (CENC) said that it is unlikely that another similar-sized earthquake would strike the same area again in the near future.[7] They added that this earthquake likely occurred within the Bayan Har block, a piece of continental crust in the Tibetan Plateau. Its main boundaries are the Xianshuihe Fault to the south and the Kunlun Fault to the north.[8] The largest earthquakes in the vicinity of the May 22 event are the 2001 Kunlun earthquake and the 1937 Tuosuo Lake earthquake,[9][10] both measuring 7.8 on the moment magnitude scale and involving a rupture on the Kunlun Fault.[11][12]

This earthquake was preceded by another unrelated earthquake, the 2021 Dali earthquake which had occurred 5 hours earlier in Yunnan.[13]

Earthquake sequence

Time

(UTC)

Latitude Longitude Depth Magnitude (Mw ) MMI Source
2021-05-21 18:04:13 34.586°N 98.255°E 10 km 7.3 VIII [3]
2021-05-21 19:03:08 34.461°N 99.003°E 10 km 4.9 - [14]
2021-05-21 19:09:18 34.804°N 97.913°E 10 km 4.8 - [15]
2021-05-21 19:49:15 34.710°N 97.828°E 10 km 4.8 - [16]
2021-05-21 20:04:30 34.566°N 98.660°E 10 km 4.5 - [17]
2021-05-21 21:59:36 34.608°N 98.348°E 10 km 4.6 - [18]
2021-05-22 02:29:37 34.936°N 97.448°E 10 km 5.1 - [19]
2021-05-22 02:38:45 34.540°N 98.927°E 10 km 5.1 - [20]
2021-05-22 03:21:18 34.730°N 98.086°E 10 km 5.2 - [21]
2021-05-22 07:06:23 34.506°N 98.828°E 10 km 4.9 - [22]
2021-05-22 09:39:36 34.755°N 97.513°E 10 km 4.3 - [23]

See also

References

  1. ^ "M 5.2 - Southern Qinghai, China". earthquake.usgs.gov. USGS. Retrieved 22 May 2021.
  2. ^ Yue Hongbin, Yan Jiaqi (22 May 2021). "青海省玛多县发生7.4级地震 西宁震感强烈". People's Daily Online. Retrieved 22 May 2021.
  3. ^ a b c "M 7.3 - Southern Qinghai, China". earthquake.usgs.gov. Retrieved 2021-05-21.
  4. ^ "A magnitude 7.4 earthquake occurred in Maduo County, Guoluo Prefecture, Qinghai Province at 2:4 on May 22" (in Chinese). China Earthquake Administration. Retrieved 22 May 2021.
  5. ^ "青海地震已致8人受伤，共记录发生453次余震". finance.sina.com.cn. 22 May 2021. Retrieved 22 May 2021.
  6. ^ "青海玛多7.4级地震 县城区域有围墙倒塌 救援队伍已集结". finance.sina.com.cn. 22 May 2021. Retrieved 22 May 2021.
  7. ^ Xue Tao, ed. (22 May 2021). "专家：青海玛多县地震原震区近期发生7级以上地震的可能性不大" (in Chinese). Xinhua News Agency. Retrieved 22 May 2021.
  8. ^ Yujun Sun, Taoyuan Fan, Chunjing Zhou, Zhonghai Wu (2015). "The Evolution of Stress and Strain around the Bayan Har Block in the Tibetan Plateau". Journal of Earthquakes. 2015: 10. doi:10.1155/2015/971628. 971628. Retrieved 22 May 2021.{{cite journal}}: CS1 maint: multiple names: authors list (link) CS1 maint: unflagged free DOI (link)
  9. ^ "M 7.8 - southern Qinghai, China". earthquake.usgs.gov. USGS. Retrieved 22 May 2021.
  10. ^ "M 7.8 - southern Qinghai, China". earthquake.usgs.gov. USGS. Retrieved 22 May 2021.
  11. ^ Jianming Guo, Aiming Lin, Guoqiang Sun, Jianjing Zheng (2007). "Surface Ruptures Associated with the 1937 M 7.5 Tuosuo Lake and the 1963 M 7.0 Alake Lake Earthquakes and the Paleoseismicity along the Tuosuo Lake Segment of the Kunlun Fault, Northern Tibet". Bulletin of the Seismological Society of America. 97 (2): 474–496. doi:10.1785/0120050103. Retrieved 22 May 2021.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  12. ^ D. P. Robinson, C. Brough, S. Das (2006). "The Mw 7.8, 2001 Kunlunshan earthquake: Extreme rupture speed variability and effect of fault geometry". JOURNAL OF GEOPHYSICAL RESEARCH. 111 (B8). doi:10.1029/2005JB004137.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  13. ^ "M 6.1 - 28 km NW of Dali, China". earthquake.usgs.gov. Retrieved 2021-05-21.
  14. ^ "M 4.9 - Southern Qinghai, China". earthquake.usgs.gov. Retrieved 2021-05-22.{{cite web}}: CS1 maint: url-status (link)
  15. ^ "M 4.8 - Southern Qinghai, China". earthquake.usgs.gov. USGS. Retrieved 22 May 2021.
  16. ^ "M 4.8 - Southern Qinghai, China". earthquake.usgs.gov. USGS. Retrieved 22 May 2021.
  17. ^ "M 4.5 - Southern Qinghai, China". earthquake.usgs.gov. USGS. Retrieved 22 May 2021.
  18. ^ "M 4.6 - Southern Qinghai, China". earthquake.usgs.gov. USGS. Retrieved 22 May 2021.
  19. ^ "M 5.1 - Southern Qinghai, China". earthquake.usgs.gov. USGS. Retrieved 22 May 2021.
  20. ^ "M 5.2 - southern Qinghai, China". earthquake.usgs.gov. USGS. Retrieved 22 May 2021.
  21. ^ "M 5.1 - Southern Qinghai, China". earthquake.usgs.gov. USGS. Retrieved 22 May 2021.
  22. ^ "M 4.9 - Southern Qinghai, China". earthquake.usgs.gov. USGS. Retrieved 22 May 2021.
  23. ^ "M 4.3 - Southern Qinghai, China". earthquake.usgs.gov. USGS. Retrieved 22 May 2021.