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Abstract. The article continues to describe the results of the study of seismotectonic deformation (STD) of the Altai-Sayan Mountain region which were presented in previous Issue of «Geosystems of Transition Zones» journal. Given work presents the results of a STD study of two zones of the Altai-Sayan region: the Altai Mountains (the region of the Chuya earthquake) and the territory that includes the Academician Obruchev ridge, the southern part of the Eastern Sayan Mountains and the Southern Baikal region. The STD computation has been performed on the basis of the approaches proposed by well-known publications of Yu.V. Riznichenko and S.L. Yunga. The derivations on STD directions are based on focal mechanisms data (591 events) that occurred from 1963 to 2021). For the considered areas, a description of seismicity is given and STD maps are constructed. According to the STD maps, the directions of the axes of shortening and elongation are determined and the deformation modes is marked. The distributions of the Lode–Nadai coefficient, the angle of kind of the stressed state (the angle of the generalized plane deformation, the phase angle of STD tensor-deviator) and the vertical component (ZZ) have been constructed using the obtained averaged STD tensors for seismogenic layer of 0–35 km depths. The zone around Chuya earthquake source site is characterized by horizontal shear deformation, with a band of transpression (Chagan-Uzun block) passing though this zone. The territory, which includes Academician Obruchev ridge, the southern part of the Eastern Sayan Mountains and the Southern Baikal region is divided into two parts according to the deformation regime. The boundary runs along the Darkhat depression: the regimes of compression, transpression and horizontal shear occur in zones lying to the west of it; the regimes tension, transtension, and the transitional regime from vertical shear to tension occurs to the east. The Chagan-Uzun block and the Academician Obruchev ridge are uplifted, and the territory to the east of the Darkhat depression is lowered.
Keywords:
earthquake, focal mechanism, STD regimes, elongation and shortening of strain axes, STD intensity, Lode–Nadai coefficient, Altai-Sayan Mountain region
For citation: Sycheva N.A. Study of seismotectonic deformations of the Earth crust in the Altai-Sayan Mountain region. Part 2. Geosistemy perehodnykh zon = Geosystems of Transition Zones, 2023, vol. 7, no. 4, pp. 335–356. (In Russ., abstr. in Engl.).
https://doi.org/10.30730/gtrz.2023.7.4.335-356, https://www.elibrary.ru/xkmcum
Äëÿ öèòèðîâàíèÿ: Ñû÷åâà Í.À. Èññëåäîâàíèå ñåéñìîòåêòîíè÷åñêèõ äåôîðìàöèé çåìíîé êîðû Àëòàå-Ñàÿíñêîé ãîðíîé îáëàñòè. ×àñòü 2. Ãåîñèñòåìû ïåðåõîäíûõ çîí, 2023, ò. 7, ¹ 4, ñ. 335–356.
https://doi.org/10.30730/gtrz.2023.7.4.335-356, https://www.elibrary.ru/xkmcum
References
1. [Earthquake catalogue of the Altai and the Sayany for 2003]. 2006. Authors: Filina A.G., Podkorytova V.G., Leskova E.V. (compilers), Denisenko G.A., Kuznetsova N.V., Manushina O.A., Podlipskaya L.A., Sheveleva S.S., Shevkunova E.V., Shatalova A.O. [The Earthquakes of Russia in 2003]. Obninsk: GS RAS. (See the Appendix of present digest of articles on CD). (In Russ.). URL: http://www.gsras.ru/zr/uploads/files/2003/2003-ER_p055-064.pdf
2. Emanov A.F., Emanov A.A., Leskova E.V., Kolesnikov Yu.I., Fateev A.V., Filina A.G. 2009. [Chuya earthquake 27 September 2003 with Ms = 7.3, Kr = 17 (Gorny Altai)]. [The earthquakes of the North Eurasia in 2003], 12. Obninsk: GS RAS, p. 326–343. (In Russ.).
3. Rogozhin E.A., Ovsyuchenko A.N., Marakhanov A.V., Ushanova E.A. 2007. Tectonic setting and geological manifestations of the 2003 Altai earthquake. Geotectonics, 41(2): 87–104.
4. Gol'din S.V., Seleznev V.S., Emanov A.F., Filina A.G., Emanov A.A., Novikov I.S., Vysotskii E.M., Fateev A.V., Kolesnikov Yu.I., Podkorytova V.G., Leskova E.V., Yarygina M.A. 2004. The Chuya earthquake and its aftershocks. Doklady Earth Sciences, 395(3): 394–396.
5. Sementsov B.G. 2005. [Altai earthquake in September–October. 2003. Natural resources of Gorny Altai], 2: 32–47. (In Russ.). URL: http://altay-geojournals.ru/wp-content/uploads/2015/02/4-5.pdf
6. Arefyev S.S., Pogrebchenko V.V., Aptekman Zh.Ya., Bykova V.V., Matveev I.V., Mikhin A.G., Molotkov S.G., Pletnev K.G. 2004. [Preliminary results of seismological observations in epicentral zone of Altai earthquake. Strong earthquake in the Altai in 27 September 2003]. In: [The data of preliminary study]. Moscow: IFZ RAN, p. 61–67. (In Russ.).
7. Ashurkov V.A. 2016. [The cause and consequences of Altai (Chuya) earthquake 27.09.2003]. Problema prognoza i otsenki seismicheskoi opasnosti krupnykh gorodov = [The problem of forecast and estimation of seismic danger for large cities], 20(1–2): 58–86. (In Russ.). URL: http://altay-geojournals.ru/wp-content/uploads/2022/02/8-20.pdf
8. Emanov A.F., Filina A.G., Emanov A.A., Fateev A.V., Leskova E.V. 2009. [The Altai and Sayany]. [The earthquakes of the North Eurasia], 12. Obninsk: GS RAS, p. 139–148. (In Russ.).
9. Emanov A.F., Emanov A.A., Fateev A.V., Shevkunova E.V., Podkorytova V.G., Durachenko A.A., Gladyshev E.A., Ershov R.A. 2021. [The Altai and Sayany]. The earthquakes of Russia in 2021. Obninsk: FRC UGS RAS, p. 38–45. (In Russ.).
10. Sycheva N.A. 2023. Study of seismotectonic deformations of the Earth’s crust in the Altai-Sayan mountain region. Pt I. Geosistemy perehodnykh zon = Geosystems of Transition Zones, 7(3): 223–242. (In Russ.). https://doi.org/10.30730/gtrz.2023.7.3.223-242
11. Emanov A.F., Emanov A.A., Chechel’nitskii V.V., Shevkunova E.V., Radziminovich Ya.B., Fateev A.V., Kobeleva E.A., Gladyshev E.A., Arapov V.V., Artemova A.I., Podkorytova V.G. 2022. The Khuvsgul earthquake of January 12, 2021 (Mw = 6.7, ML = 6.9) and early aftershocks. Izv., Physics of the Solid Earth, 58(1): 59–73. https://doi.org/10.1134/s1069351322010025
12. Misharina L.A. 1972. [Stresses in the earthquake focuses of Mongolia-Baikal zone]. In: [The field of elastic stresses of the Earth and mechanism of earthquake focuses]. Moscow: Nauka, p. 161–171.
13. Zhalkovsky N.D., Kuchai O.A., Muchnaya V.I. 1995. [Seismicity and certain characteristics of stress state of Earth crust of Altai-Sayany area]. Geology and geophysics, 36(10): 20–30. (In Russ.).]
14. Kuznetsova K.I., Lukina N.V., Kuchai O.A. 1999. [Deformation of Earth crust and upper mantle: the problem of interdependence (Altai-Sayany area)]. Volcanology and seismology, 4/5: 41–49. (In Russ.).
15. Gol'din S.V., Kuchai O.A. 2007. Seismic strain in the Altai-Sayan active seismic area and elements of collisional geodynamics. Russian Geology and Geophysics, 48(7): 536–557.
16. Goldin S.V., Dyad’kov P.G., Dashevskiy Yu.A. 2001. The South Baikal geodinamic testing ground: Strategy of earthquake prediction. Russian Geology and Geophysics, 42(10): 1484–1496. (In Russ.).
17. Radziminovitch N.A., Melnikova V.I., San'kov V.A., Levi K.G. 2006. Seismicity and seismotectonic deformations of the crust in the Southern Baikal basin. Izv., Physics of the Solid Earth, 42(11): 904–920. https://doi.org/10.1134/s1069351306110048
18. Radziminovich N.A., Bayar G., Miroshnichenko A.I., Demberel S., Ulziibat M., Ganzorig D., Lukhnev A.V. 2016. Focal mechanisms of earthquakes and stress field of the crust in Mongolia and its surroundings. Geodynamics & Tectonophysics, 7(1): 23–38. https://doi.org/10.5800/GT-2016-7-1-0195
19. Radziminovich N.A. 2021. Focal mechanisms of earthquakes of Southern Baikal Region and Northern Mongolia. Geodynamics & Tectonophysics, 12(4): 902–908. doi:10.5800/GT-2021-12-4-0562
20. Rebetsky Yu.L., Kuchai O.A., Marinin A.V. 2013. Stress state and deformations of the Earth's crust in the Altai-Sayany Mountain region. Russian Geology and Geophysics, 54(2): 206–222. https://doi.org/10.1016/j.rgg.2013.01.011
21. Goldin S.V., Timofeev V.Yu., Ardyukov D.G. 2005. Fields of the Earth's surface displacement in the Chuya earthquake zone in Gornyi Altai. Doklady Earth Sciences, 405À(9): 1408–1413. EDN: LJKWIT
22. Timofeev V.Yu., Ardyukov D.G., Kale E., Duchkov A.D., Zapreeva E.A., Kazantsev S.A., Rusbek F., Bryuniks K. 2006. Displacement fields and models of current motion in Gorny Altai. Russian Geology and Geophysics, 47(8): 915–929. EDN: TQNFQZ
23. Timofeev V.Y., Ardyukov D.G., Boyko E.V., Timofeev A.V., Gribanova E.I., Semibalamut V.M., Yaroshevich A.V. 2012. Strain and displacement rates during a large earthquake in the South Baikal region. Russian Geology and Geophysics, 53(8): 798–816. https://doi.org/10.1016/j.rgg.2012.06.007
24. Sankov V.A., Parfeevets A.V. 2020. The cenozoic crustal stress state of Mongolia according to geological and structural data (review). Geodynamics & Tectonophysics, 11(4): 722–742. (In Russ.) https://doi.org/10.5800/GT-2020-11-4-0503
25. Sycheva N.A., Mansurov A.N. 2017. Comparison of crustal deformation rates estimated from seismic and GPS data on the Bishkek geodynamic polygon. Geodynamics & Tectonophysics, 8(4): 809–825. (In Russ.). https://doi.org/10.5800/gt-2017-8-4-0318
26. Sycheva N.A., Mansurov A.N. 2020. Seismotectonic deformation of the lithosphere in the Pamir and adjacent territories. Geodynamics & Tectonophysics, 11(4): 785–805. (In Russ.). https://doi.org/10.5800/GT-2020-11-4-0507
27. Sycheva N.A. 2021. Crustal seismotectonic deformations in Central and Western Tien-Shan. Journal of Volcanology and Seismology, 15(6): 414–434. https://doi.org/10.1134/s0742046321060105
28. Sycheva N.A., Bogomolov L.M., Kuzikov S.I. 2020. Computational technologies in seismological research (on the example of KNET, Northern Tian Shan). Yuzhno-Sakhalinsk: IMGG FEB RAS, 358 p.; Suppl.: 1 electronic optical disks (CD). (In Russ.). doi:10.30730/978-5-6040621-6-6.2020-2
29. Riznichenko Yu.V. 1985. [Problems of seismology]. Moscow: Nauka, 408 p. (Izbrannye trudy [Selected works]). (In Russ.).
30. Bachmanov D.M., Kozhurin A.I., Trifonov V.G. 2017. The active faults of Eurasia database. Geodynamics & Tectonophysics, 8(4): 711–736. (In Russ.). https://doi.org/10.5800/gt-2017-8-4-0314; EDN: ZWRGN
31. Rogozhin E.A., Platonova S.G. 2002. [Focal zones of strong earthquakes in Gorny Altai in Holocene]. Moscow: OIFZ RAN, 130 p. (In Russ.).
32. Leskova E.V., Yemanov A.A. 2006. Deformation pattern for the epicentral area of Chuya earthquake (September 27, 2003, K = 17, Gorny Altai) according to analysis data for aftershock focal mechanisms. Physical mesomechanics, 9(1): 51–55. (In Russ.). EDN: IJGIRL
33. Novikov I.S. 2004. [Morphotectonics of Altai]. Novosibirsk: Pub. House SB RAS, GEO, 313 p. (In Russ.). URL: http://neotec.ginras.ru/comrus/_novikov-i-s-2004-morfotektonika-altaya-glava-7-kaynozoyskaya-tektonika-altaya-i-ee-geomorfologicheskie-proyavleniya.pdf
34. Rogozhin E.A., Bogachkin B.M., Ioganson L.I., Reisner G.I., Bayasgalan A., Kochetkov V.M., Kurushin R.A. 1995. [The experience of separating and tracing of seismogenerating zones by methods of geologo-tectonic analysis on the territory of Western Mongolia and Zaisan-Altai folded area]. [Seismicity and seismic zoning of the North Eurasia], 2–3. Moscow: OIFZ RAN, p. 132–152. (In Russ.).
35. Denisenko G.A., Leskova E.V., Manushina O.A., Podkorytova V.G., Podlipskaya L.A., Shatalova A.O., Sheveleva S.S., Shevkunova E.V. 2018. [Earthquake catalogues on different regions of Russia. Chuya – Kuray zone of Gorny Altai in 2015–2016. (ML ≥ 2.5)]. The earthquakes of Russia in 2016. Obninsk: FRC UGS RAS, p. 180–181. (In Russ.). URL: http://www.gsras.ru/zr/uploads/files/2016/2016-ER_p180-181.pdf
36. Emanov A.F., Emanov A.A., Fateev A.V., Shevkunova E.V. 2020. [The observations by temporal nets: Chuya – Kuray zone of Gorny Altai]. The earthquakes of Russia in 2018. Obninsk: FRC UGS RAS, p. 117–120. (In Russ.).
37. Leskova E.V., Emanov A.A. 2013. Hierarchical properties of the tectonic stress field in the source region of the 2003 Chuya earthquake. Russian Geology and Geophysics, 54(1): 87–95. https://doi.org/10.1016/j.rgg.2012.12.008
38. Rebetskii Yu.L. 2007. [Tectonic stresses and strength of mountain ranges]. Moscow: Akademkniga, 406 p. (In Russ.).
39. Emanov A.F., Filina A.G., Emanov A.A., Fateev A.V., Yarygina M.A. 2004. [The Altai and Sayany]. [The earthquakes of the North Eurasia], 7 (1998). Obninsk: GS RAS, p. 116–125. (In Russ.).
40. Mel'nikova V.I., Gilyova N.A., Radziminovich Ya.B., Seredkina A.I. 2014. [Kultuk earthquake in 27 August 2008 with Mw=6.3, I0=8–9 (Southern Baikal)]. [The earthquakes of the North Eurasia], 17 (2008). Obninsk: GS RAS, p. 386–407. (In Russ.). URL: http://www.gsras.ru/zse/uploads/files/eq_ne_2008/2008-Strong_and_sensible_Eathqueakes-Kultuk-386-407.pdf
41. Golenetskii S.I., Khromovskikh V.S. (compilers). 1977. [Pribaikal'e (2000 before n.e. – 500 n.e.) – 1974; M ≥ 5.0; I0 ≥ 6]. In: [New catalogue of strong earthquakes on USSR territory from ancient times till 1975]. Moscow: Nauka, p. 315–338. (In Russ.). URL: https://www.geokniga.org/bookfiles/geokniga-novyy-katalog-silnyh-zemletryaseniy-na-territorii-sssr-s-drevneyshih-vremen-.pdf
42. Khaidurova E.V., Gileva N.A. (compilers) 2014. [Catalogue of Kultuk subsequence of earthquakes with Kr > 6.5 (N = 414) in 2008, with strong earthquake in 27 August 2008 with Mw = 6.3, I0 = 8–9]. [Earthquakes of the North Eurasia], 17 (2008). Obninsk: GS RAS. (Appendix to year book ¹ 17 (2008) on CD). (In Russ.). URL: http://www.gsras.ru/zse/app-17.html
43. Emanov A.F., Emanov A.A., Fateev A.V., Soloviev V.M., Shevkunova E.V., Gladyshev E.A., Antonov I.A., Korabelshchikov D.G., Podkorytova V.G., Yankaitis V.V., Elagin S.A., Serezhnikov N.A., Durachenko A.V., Artemova A.I. 2021. Seismological studies in the Altai-Sayan Mountain region. Rossiiskii seismologicheskii zhurnal = Russian Journal of Seismology, 3(2): 20–51. (In Russ.). https://doi.org/10.35540/2686-7907.2021.2.02
44. Emanov A.F., Emanov A.A., Filina A.G., Leskova E.V., Kolesnikov Yu.I., Rudakov A.D. 2006. The common and individual in development of aftershocks of largest earthquakes in the Altai-Sayan Mountain region. Physical mesomechanics, 9(1): 33–43. (In Russ.). EDN: IJGIQR
45. Ovsyuchenko A.N., Butanaev Yu.V. 2017. Seismic history of the Altai-Sayany region and the 2011–2012 earthquakes in Tuva. New Research of Tuva, 1. (In Russ.). https://doi.org/10.25178/nit.2017.1.11; EDN: XXWZDN
46. Yemanov A.F., Yemanov A.A., Leskova E.V., Seleznev V.S., Fateev A.V. 2014. The Tuva earthquakes of December 27, 2011, ML = 6.7, and February 26, 2012, ML = 6.8, and their aftershocks. Doklady Earth Sciences, 456(1): 594–597. https://doi.org/10.1134/s1028334x14050249
47. Yunga S.L. 1997. On the classification of seismic moment tensors based on their isometric mapping onto a sphere. Doklady Akademii Nauk, 352(2): 253–255. (In Russ.).