ADYR FAULTS – GENERATORS OF THE STRONG EARTHQUAKES
IN THE ISSYK-KUL LAKE DEPRESSION
(ON EXAMPLE OF KULTOR FAULT ZONE)


A.M. Korzhenkov1, A.A. Strelnikov1, E.V. Deev2,3, L.A. Korzhenkova1, J. Liu4, J.V. Mazeika5, E.A. Rogozhin1, S.N. Rodina1, I.V. Turova2,3, M.T. Usmanova6, A.B. Fortuna7


1.Schmidt Institute of Physics of the Earth, Moscow, Russia

2.Novosibirsk State University, Novosibirsk, Russia

3.Trofimuk Institute of Oil and Gas Geology and Geophysics SB RAS, Novosibirsk, Russia

4. Geological Institute of Chinese Seismological Survey, Beijing, China

5 State Research Institute «Centre of Nature Research», Vilnius, Lithuania

6. Mavlyanov Institute of Seismology AS of Republic of Uzbekistan, Tashkent, Uzbekistan

7.Institute of Seismology NAS KR, Bishkek, Kyrgyzstan


Corresponding author: S.N. Rodina, e-mail: rodina@ifz.ru


Abstract. We have studied eastern end of the Kultor adyr (foothill) fault in northern Issyk-Kul Lake region. Morphologically the fault zone is a staircase of seismic fault scarps formed by movements along few adjacent ruptures gently tilted under the adyrs (northward). Numerous saka-wusun, turkic and karakhanid archeological monuments got onto slope parts of the fault scarps and were damaged and destroyed. Logging of paleoseismological trenches excavated across southernmost and youngest fault scarps allows to determine minimal age, reoccurrence interval and energy of strong historical earthquakes. Strong earthquakes along studied part of the adyr fault occurred during periods: 60–170 AD; 530–620 AD; 1160–1250 AD; 1410–1460 AD. Time intervals among dates (strong earthquakes reoccurrence along the fault) is 200–600 years. Obtained parameters of the fault scarps were used for calculation of magnitudes of the historical seismic events: М = 7.2 and М = 6.9 according to heights of studied fault scarps. These magnitudes can produce seismic oscillations in the earth surface of I0 ≥ IX according to MSK-64 scale. Our earlier supposition on involvement into uplift southern parts of the Issyk-Kul depression has got confirmation. Lateral longitudinal increasing of adyrs square takes place during strong earthquakes. These conclusions are important at consideration of new seismic hazard assessment of the northern Issyk-Kul Lake region, most populated part of the Issyk-Kul Oblast' of Kyrgyz Republic, as well as for other regions of the Earth Globe developing in regime of the postplatform orogens.


Keywords: adyrs, fault scarps, strong earthquakes, trenching, paleoseismology, archeoseismology, Kultor fault, Issyk-Kul depression, Kungey Ala-Too Range, seismic hazard


About the authors


KORZHENKOV Andrey Mikhailovich – Doctor of Geological and Mineralogical Sciences, Head of Laboratory, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Russia, 123242, Moscow, Bolshaya Gruzinskaya st., 10-1. E-mail: korzhenkov@ifz.ru


STRELNIKOV Andrey Andreevich – Researcher, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Russia, 123242, Moscow, Bolshaya Gruzinskaya st., 10-1. E-mail: aas@ifz.ru


DEEV Eugeniy Viktorovich - Doctor of Geological and Mineralogical Sciences, Leading Researcher, Trofimuk Institute of Oil and Gas Geology and Geophysics SB RAS; Professor, Novosibirsk State University. Russia, 630090, Novosibirsk, Akad. Koptyug Av., 3. E-mail: deevev@ngs.ru


KORZHENKOVA Lyubov Andreevna – Ph.D. Student, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Russia, 123242, Moscow, Bolshaya Gruzinskaya st., 10-1. E-mail: korjenkova2404@mail.ru


LIU Jiao – Candidate of Geological and Mineralogical Sciences, Assistant Researcher, Institute of Geology, China Earthquake Administration. China, 100029, Beijing, Chaoyang district, Huayanli, 1. E-mail: liujiao@ies.ac.cn


MAZEIKA Jonas Valeriono – Doctor of Geological and Mineralogical Sciences, Professor, Head of Laboratory, State Research Institute «Center of Nature Research». Lithuania, LT-08412, Vilnius, Akademijos str., 2. Е-mail: mazeika@geo.lt


ROGOZHIN Eugeniy Aleksandrovich – Doctor of Geological and Mineralogical Sciences, Professor, Head of Coordination and Prognosis Center, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Russia, 123242, Moscow, Bolshaya Gruzinskaya st., 10-1. E-mail: eurog@ifz.ru


RODINA Svetlana Nikolaevna Candidate of Geological and Mineralogical Sciences, Researcher, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Russia, 123242, Moscow, Bolshaya Gruzinskaya st., 10-1. E-mail: rodina@ifz.ru


TUROVA Irina Vitalievna – Technician, Trofimuk Institute of Oil and Gas Geology and Geophysics SB RAS; Ph.D. student, Novosibirsk State University. Russia, 630090, Novosibirsk, Akad. Koptyug Av., 3. E-mail: irinka.turova@yandex.ru


USMANOVA Makhira Turabovna – Candidate of Physical and Mathematical Sciences, Senior Researcher, Mavlyanov Institute of Seismology, AS of Republic of Uzbekistan. Uzbekistan, 100128, Tashkent, Zulfiyakhonim str., 3. E-mail: m.usmanova@mail.ru


FORTUNA Alla Borisovna Candidate of Geological and Mineralogical Sciences, Scientific Secretary, Institute of Seismology, NAS of Kyrgyz Republic. Kyrgyzstan, 720060, Bishek, Asanbay 52/1. Е-mail: alla-fortuna0@rambler.ru


Cite this article as: Korzhenkov A.M., Strelnikov A.A., Deev E.V., Korzhenkova L.A., Liu J., Mazeika J.V., Rogozhin E.A., Rodina S.N., Turova I.V., Usmanova M.T., Fortuna A.B. Adyr faults – generators of the strong earthquakes in the Issyk-Kul Lake depression (on example of Kultor fault zone), Voprosy Inzhenernoi Seismologii (Problems of Engineering Seismology). 2020. V. 47, No. 2. P. 19–44. [in Russian]. https://doi.org/10.21455/VIS2020.2-2

English translation of the article will be published in Seismic Instruments, ISSN: 0747-9239 (Print) 1934-7871 (Online), https://link.springer.com/journal/11990