Correlation of the state of crustal stresses, seismicity and landslide activity (Fergana basin, Tien Shan)

The impacts of seismicity on the landslide activity in Kyrgyzstan have been in the focus of our study since 2010 [Kalmetyeva et al., 2010]. As the study progressed [Kalmetyeva, Moldobekov, 2012, 2013; Kalmetyeva et al., 2013, 2014], the initial problem statement has been revised as follows: do earthquake influence the occurrence of land‐ slides, and, if so, what is the mechanism of this influence. This paper presents the results of detailed analysis of the distribution of earthquakes and landslides in space and time in correlation with focal mechanisms (azimuth and plunge of the principal compression stress axis) of earthquakes occurred in the Fergana basin and its mountainous frame. These are grounds to conclude that the landslide activity is mainly influenced by the response of the internal structure of the upper crust to local stresses. The mechanism of influence of strong earthquakes on the landslide activity is redistribution of local stresses, which results from partial release of regional stresses due to rupturing in the source zones of strong earthquakes. Using this concept of the landslide activity, a methodology of landslide‐hazard mapping is the goal of our future studies aimed at the following: (1) zoning of the study area with respect to the features of the internal structure of the upper crust, (2) geological, geophysical and seismological studies of the state of stresses in the study area, (3) instrumental monitoring of landslides movements in the zones that differ in the structure of the upper crust, and (4) analysis of preparation and consequences of past strong earthquakes that took place in the study area in comparison with the landslide activity.

seismic cycle, earthquake, focal mechanism, main stress axes, landslide, atmospheric precipitation

1. Abdrakhmatov K.E., Kalmetyeva Z.A., Mikhailova N.N., Sydykov A., Sadykova A.B., Silacheva I.V., Usmanova M.T., Chekhovskaya R.A., 2008. Seismological database of Central Asia as the basis for the study of regional geodynamic processes. In: Geodynamics of intracontinental orogens and geoecological problems. Proceedings of the Fourth International Symposium (Bishkek, June 15–23, 2008). Bishkek, p. 363–367 (in Russia).

2. Abdybachaev U.A., 2015. Unified Database on Landslides of Kyrgyzstan (Final Report, Contract No. 2A/13–1). CentralAsian Institute for Applied Geosciences (CAIAG), Bishkek, 65 p. (in Russian).

3. Bakirov A.B. (Ed.), 2006. The Earth's Crust and Upper Mantle of the Tien Shan in Connection to Geodynamics and Seismicity. Ilim, Bishkek, 116 p. (in Russian).

4. Bogdanovich K.I., Kark I.M., Korolkov B.Ya. Mushketov D.I., 1911. Earthquakes in the northern ranges of the Tien Shan on December 12, 1910 (04.01.1911). Proceedings of the Geological Committee 30 (4), 329–419 (in Russian).

5. Brune J.N., 1979. Implications of earthquake triggering and rupture propagation for earthquake prediction based on premonitory phenomena. Journal of Geophysical Research: Solid Earth 84 (B5), 2195–2198. https://doi.org/10.1029/JB084iB05p02195.

6. Chedia O.K., 1986. Morphostructures and Modern Tectogenesis of the Tien Shan. Ilim, Frunze, 312 p. (in Russian).

7. Dzhanuzakov K.D., Omuraliev M., Omuralieva A., Ilyasov B.I., Grebennikova V.V., 2003. Strong Earthquake of the Tien Shan. Ilim, Bishkek. 215 p. (in Russian).

8. Gafurov V.G. (Ed.), 1986. The 1984 Pap Earthquake. FAN, Tashkent, 136 p. (in Russian).

9. Grin V.P., Ilyasov B.I., Kim N.I., Lopatina T.A., Medzhitova Z.A., Serebryanskaya T.Ya., 1980. Some results of prognostic studies on the Frunze test site. In: Physical processes in earthquake sources. Nauka, Moscow, p. 14–26 (in Russian).

10. Ibatulin Kh.V., 2011. Landslide Monitoring of Kyrgyzstan. Ministry of Emergency Situations of the Kyrgyz Republic, Bishkek, 145 p. (in Russian).

11. Kalmetyeva Z.A., Berezina A.V., Moldobekova S.K., Torgoev I.A., 2013. Using the national monitoring network of IS NAS KR to study landslides. Herald of NNC RK (2), 116–120 (in Russian).

12. Kalmetyeva Z.A., Kostyuk A.D., Meleshko A.V., Sycheva N.A., 2010. On the relationship of landslides and earthquakes. Proceedings of the NAS KR (4), 19–27 (in Russian).

13. Kalmetyeva Z.A., Mikolaichuk A.V., Moldobekov B.D., Meleshko A.V., Zhantaev M.M., Zubovich A.V., 2009. Atlas of Kyrgyzstan Earthquakes. CAIAG, Bishkek, 213 p. (in Russian).

14. Kalmetyeva Z.A., Moldobekov B.D., 2012. Analysis of landslide activity in seismic regions (Tien Shan). Georisk (3), 26–33 (in Russian).

15. Kalmetyeva Z., Moldobekov B., 2013. Landslides, seismicity and geodynamics in the territory of Kyrgyzstan. In: F. Wu, S. Qi (Eds), Global view of engineering geology and the environment. Taylor & Francis Group, London, p. 581–586.

16. Kalmetyeva Z.A., Moldobekov B.D., Torgoev I.A., Volkhin I.I., 2014. Landslides and crustal stress field according to earthquake focal mechanism (Tian Shan). Geofizicheskiye Issledovaniya (Geophysical Research) 15 (2), 47–58 (in Russian).

17. Kuchay O.A., Kalmet’eva Z.A., Kozina M.E., Abdrakhmatov K.E., 2017. Stress fields revealed by aftershocks of the strongest earthquakes of Tien Shan. Geodynamics & Tectonophysics 8 (4), 827–848 (in Russian). https://doi.org/10.5800/GT-2017-8-4-0319.

18. Meleshko A.V., Usupaev Sh.E., Torgoev I.A., 2002. Modern landlides of Kyrgyzstan: retrospective analysis of their development at representative sites. In: Massive rock slope failure: new models for hazard assessment. Abstracts volume of the NATO advanced research workshop (Celano, Abruzzo, Italy, 16–21 June 2002). Celano, p. 97.

19. Mikolaychuk A.V., 2009. Geodynamics and seismicity of Kyrgyzstan. In: Atlas of Kyrgyzstan earthquakes. CAIAG, Bishkek, 213 p. (in Russian).

20. Niyazov R.A., 2017. Uzbekistan landslides, state of research and risk mitigation. In: Studies of landslides and their risk mitigation in Central Asia: Proceedings of the UNESCO Conference. Almaty, p. 19–48 (in Russian).

21. Niyazov R.A., Nurtayev B.S., 2015. Deep-focus Hindu Kush earthquakes as a trigger for initiation of liquefaction landslides. In: Analysis, forecast and management of risk threats in the modern world. Proceedings of the 9th International scientific and practical conference. Peoples' Friendship University of Russia, Moscow, p. 36–41 (in Russian).

22. Postoev G.P., 2010. Equations of massif state for landslides formation. Inzhenernaya Geologiya (Engineering Geology) (4), 48–53 (in Russian).

23. Postoev G.P., Kazeev A.I., 2011. About protection strategy on territories with deep landslides. In: Environmental geosciences and engineering survey for territory protection and population safety. Delegate papers of International Conference EngeoPro–2011. Moscow, p. 342–348.

24. Rebetsky Yu.L., 2006. Dilitancy, pore fluid pressure and new data on rock masses strength in natural location. In: Yu.G. Leonov (Ed.), Fluids and geodynamics. Nauka, Moscow, p. 120–146. (In Russian).

25. Rebetsky Yu.L., 2007. Tectonic Stresses and Strength of Mountain Ranges. Akademkniga, Moscow, 406 p. (in Russian).

26. Rebetsky Yu.L., Guo Y.-S., 2019. From natural stresses in seismic zones to predictions of mega earthquake nucleation zones. Pure and Applied Geophysics (in press). https://doi.org/10.1007/s00024-019-02128-0.

27. Rebetsky Yu.L., Kuchai O.A., Sycheva N.A., Tatevossian R.E., 2012. Development of inversion methods on fault slip data: Stress state in orogenes of the Central Asia. Tectonophysics 581, 114–131. https://doi.org/10.1016/j.tecto.2012. 09.027.

28. Rebetsky Yu.L., Kuzikov S.I., 2016. Active faults of the northern Tien Shan: tectonophysical zoning of seismic risk. Russian Geology and Geophysics 57 (6), 967–983. https://doi.org/10.1016/j.rgg.2016.05.004.

29. Rebetsky Yu.L., Kuzikov S.I., Sycheva N.A., 2017. Active faults of the Northern Tien Shan and stress state of the Earth's crust. In: Problems of geodynamics and geoecology of intracontinental orogenes. Abstracts of the VII International Symposium. Research Station of RAS, Bishkek, p. 262–263 (in Russian).

30. Rebetsky Yu.L., Sycheva N.A., Sychev V.N., Kuzikov S.I., Marinin A.V., 2016. The stress state of the northern Tien Shan crust based on the KNET seismic network data. Russian Geology and Geophysics 57 (3), 387–408. https://doi.org/10.1016/j.rgg.2016.03.003.

31. Seismic Zoning of the USSR Territory (SR-78), 1980. Nauka, Moscow, 399 p. (in Russian) [Сейсмическое районирование территории СССР (СР-78). М.: Наука, 1980. 399 с.].

32. Specht S., Ozturk U., Veh G., Cotton F, Korup O., 2019. Effects of finite source rupture on landslide triggering: The 2016 Mw 7.1 Kumamoto earthquake. Solid Earth 10 (2), 463–486. https://doi.org/10.5194/se-10-463-2019.

33. Strom A.L., Abdrakhmatov K.E., Kozhogulov K.Ch., Nikolskaya O.V., 2005. Tectonics, seismicity and rock collapselandslide processes. In: Modern geodynamics of the areas of intracontinental collision mountain formation (Central Asia). Nauchny Mir, Moscow, p. 290–299 (in Russian).

34. Torgoev I., Aleshin Y., Torgoev A., 2011. Monitoring of landslides in the Kyrgyzstan. In: Environmental geosciences and engineering survey for territory protection and population safety. Delegate Papers of International Conference EngeoPro–2011. Moscow, p. 379–383.

35. Yudakhin F.N., Kalmetyeva Z.A., 1994. Relationship between strong earthquakes of High Asia. Doklady AN 335 (2), 225–231 (in Russian).