Strong Paleoearthquakes along the Aksuu Border Fault according to the Results of Dating the Offset Terrace Complex of the Chon-Aksuu River, Northern Tien Shan

A. M. Korzhenkov; J. R. Arrowsmith; C. J. Crosby; B. Guralnik; E. A. Rogozhin; A. A. Sorokin; S. V. Abdieva; A. B. Fortuna; A. S. Yudakhin; A. R. Agatova; E. V. Deev; J. V. Mazeika; M. V. Rodkin; J. Shen

doi:10.1134/S106935131802009X

Strong Paleoearthquakes along the Aksuu Border Fault according to the Results of Dating the Offset Terrace Complex of the Chon-Aksuu River, Northern Tien Shan

Authors: Korzhenkov A.M.¹^,2, Arrowsmith J.R.³, Crosby C.J.³, Guralnik B.³, Rogozhin E.A.¹, Sorokin A.A.¹, Abdieva S.V.², Fortuna A.B.², Yudakhin A.S.², Agatova A.R.⁴^,5, Deev E.V.⁶^,7, Mazeika J.V.⁸, Rodkin M.V.⁹, Shen J.¹⁰
Affiliations:
1. Schmidt Institute of Physics of the Earth
2. Kyrgyz Russian Slavic University
3. Arizona State University in Tempe
4. Sobolev Institute of Geology and Mineralogy
5. Ural Federal University
6. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch
7. Novosibirsk State University
8. Nature Research Center
9. Institute of Earthquake Prediction Theory and Mathematical Geophysics
10. Institute of Disaster Prevention
Issue: Vol 54, No 2 (2018)
Pages: 252-268
Section: Article
URL: https://journal-vniispk.ru/1069-3513/article/view/224436
DOI: https://doi.org/10.1134/S106935131802009X
ID: 224436

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Abstract

The study and radiocarbon dating of the low alluvial terraces of the Chon-Aksuu River, in the Northern Issyk-Kul region, which were broken by the Kebin (Kemin) earthquake of 1911 (Ms = 8.2, Io = 10 to 11), are carried out. The obtained radiocarbon dated ages refer to the second half of the Holocene. Since that time, at least eight strong earthquakes took place along this (Chon-Aksuu) segment of the Aksuu border fault. Three seismic events, including the earthquake of 1911 occurred in the second millennium A.D. This outburst of seismic energy was preceded by two millennia of seismic quiescence, which set in after another pulse of seismic activation. The latter lasted for 1.5 millennia and included five strong earthquakes. The recurrence period of seismic events during the activations is 300–600 years. Hence, the seismic regime along the Chon–Aksuu segment of the Aksuu border fault in the second half of the Holocene was a succession of two seismic activations, each with a duration of 1.0–1.5 ka, which were separated by a 2-ka interval of seismic quiescence. Therefore, the absolute datings of the river terraces of different ages which have been broken by a seismogenic rupture can serve as a reliable source of information about the age of the strong earthquakes that occurred along the seismogenic fault.

Keywords

Tien Shan, Issyk-Kul, Aksuu ramp graben, seismic rupture, radiocarbon dating, strong earthquakes, paleoseismology, structural geomorphology, river terraces, recurrence of earthquakes, seismic quiescence

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Strong Paleoearthquakes along the Aksuu Border Fault according to the Results of Dating the Offset Terrace Complex of the Chon-Aksuu River, Northern Tien Shan

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Abstract

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About the authors

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