2021 Khövsgöl earthquake

2021 Khövsgöl earthquake
2021 Khövsgöl earthquake is located in Mongolia
2021 Khövsgöl earthquake
UTC time2021-01-11 21:32:59
ISC event619647426
USGS-ANSSComCat
Local dateJanuary 12, 2021 (2021-01-12)
Local time05:32
Magnitude6.7 Mw
6.9 ML[1]
Depth10.0 km (6.2 mi)
Epicenter51°16′52″N 100°26′17″E / 51.281°N 100.438°E / 51.281; 100.438[2]
Areas affectedMongolia
Russia
Max. intensityMMI IX (Violent)[1]
Casualties59 injured[3][2]

The 2021 Khövsgöl earthquake was a magnitude 6.7 earthquake that occurred on January 12, 2021. It was located about 50 km south of the Russian border in the Khövsgöl Lake.

Tectonic setting

Mongolia has complicated tectonic and structural geology, belonging to the Mongolian-Okhotsk Mobile Zone, between the Siberian Platform and Chinese Platform. The basement rocks formed during the Paleozoic in the Precambrian as Riphean age ophiolite formations experienced rifting from 1.7 to 1.6 billion years ago and again around 800 million years ago. The closing of a late Proterozoic ocean generated the ophiolites and the oldest basement rock. The Baikalides and Altaid mountain belts represent the accretion of island arcs into the Paleozoic. The collision of small microcontinents like Amuria and the large collision between Asia and Gondwana in the Mesozoic and Cenozoic had a major impact on the region. Crustal extension created the Mongolian Plateau, while rifting, crustal thinning, block faulting and basalt eruptions produced terrain very similar to the Basin and Range province in the western United States.[4] One of the strongest earthquakes in Mongolia was the 1957 Bayanhongor earthquake, which measured Mw 8.1 and caused 30 fatalities.

Earthquake

The earthquake was the largest in Mongolia since a 7.0 event in 1967.[5] It was initially reported as 6.8 Mw, before being downgraded to 6.7.[6] It was located about 50 km from the Mongolian town of Turt, and 55 km from the Russian border.[7][8] According to PAGER, 17,000 people felt moderate to strong shaking.[8] It was felt as far away as Irkutsk and Cheremkhovo in Russia.[9]

It was assigned a maximum Modified Mercalli intensity of IX (Violent).[1] It was felt as far as eastern and western Siberia. The earthquake occurred due to shallow oblique-normal faulting beneath the lake along the Khuvsgul Fault. It is the largest recorded earthquake on the fault, which has the potential to generate 7.0–7.5 earthquakes.[1] Rupture occurred on the 45°, east-dipping fault, and propagated at a speed of 2 km/s. The estimated rupture area was 40 × 20 km2, and two zones of significant slip were detected.[10] An average slip of 1 meter was inferred.[11]

Aftershocks

At least 7 aftershocks above magnitude 5 were recorded by the USGS,[12] With the strongest being a magnitude 5.6 on May 3, 2021.[13]

Damage and casualties

220 public buildings around Khövsgöl lake and as far south as Mörön were damaged with cracked walls and broken windows, while two houses were completely destroyed. Although no one was killed, 59 people were injured and some had to be treated for symptoms such as heart problems and high blood pressure. Eight buildings were damaged in parts of Russia closest to the epicentre.[3][14]

See also

References

  1. ^ a b c d A. F. Emanov; A. A. Emanov; V. V. Chechel’nitskii; E. V. Shevkunova; Ya. B. Radziminovich; A. V. Fateev; E. A. Kobeleva; E. A. Gladyshev; V. V. Arapov; A. I. Artemova; V. G. Podkorytova (2022). "The Khuvsgul Earthquake of January 12, 2021 (MW = 6.7, ML = 6.9) and Early Aftershocks". Izvestiya, Physics of the Solid Earth. 58 (1). Springer: 59–73. Bibcode:2022IzPSE..58...59E. doi:10.1134/S1069351322010025. S2CID 246752671.
  2. ^ a b "M 6.7 - 30 km SSW of Turt, Mongolia". United States Geological Survey. Retrieved January 11, 2021.
  3. ^ a b "Risklayer Explorer". risklayer.com. Archived from the original on February 18, 2022. Retrieved February 20, 2022.
  4. ^ Moores, E.M.; Fairbridge, Rhodes W. (1997). Encyclopedia of European & Asian Regional Geology. Springer. p. 545.
  5. ^ "M 7.0 - central Mongolia". United States Geological Survey. January 5, 1967. Retrieved 22 August 2021.
  6. ^ "Strong earthquake hits lake in northern Mongolia". 11 January 2021. Retrieved 22 August 2021.
  7. ^ "Magnitude 6.7 Earthquake Hits Russia-Mongolia Border Region". Retrieved 22 August 2021.
  8. ^ a b "Mongolia - Earthquake (GDACS, USGS, media) (ECHO Daily Flash of 12 January 2021)". 12 January 2021.
  9. ^ "Magnitude 6.7 earthquake occurs in the Russia-Mongolia border region".
  10. ^ Gang Liu; Xuejun Qiao; Pengfei Yu; Yu Zhou; Bin Zhao; Wei Xiong (2021). "Rupture Kinematics of the 11 January 2021 Mw 6.7 Hovsgol, Mongolia, Earthquake and Implications in the Western Baikal Rift Zone". Seismological Research Letters. 92 (6). GeoScienceWorld: 3318–3326. Bibcode:2021SeiRL..92.3318L. doi:10.1785/0220210061. S2CID 237800744.
  11. ^ E. P. Timoshkina; V. O. Mikhailov; V. B. Smirnov; M. S. Volkova; S. A. Khairetdinov (2022). "Model of the Rupture Surface of the Khuvsgul Earthquake of January 12, 2021 From InSAR Data". Izvestiya, Physics of the Solid Earth. 58 (1). Springer: 74–79. Bibcode:2022IzPSE..58...74T. doi:10.1134/S1069351322010098. S2CID 246752531.
  12. ^ "Significant earthquakes - 2021". Retrieved 22 August 2021.
  13. ^ "M 5.6 - 28 km SW of Turt, Mongolia". Retrieved 22 August 2021.
  14. ^ "Газар хөдлөлтөөс үүдэж Хөвсгөл аймгийн зургаан суманд барилгын хана, цонх цуурсан байна". Archived from the original on January 14, 2021. Retrieved January 13, 2021.

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