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.
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Original Russian Text © 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, 2018, published in Fizika Zemli, 2018, No. 2, pp. 64–80.
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Korzhenkov, A.M., Arrowsmith, J.R., Crosby, C.J. et al. 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. Izv., Phys. Solid Earth 54, 252–268 (2018). https://doi.org/10.1134/S106935131802009X
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DOI: https://doi.org/10.1134/S106935131802009X