PALEOSEISMOLOGICAL AND ARCHAEOSEISMOLOGICAL DATA FROM THE WESTERN ALABASH-KONUROLEN INTRAMONTANE BASIN (southern Lake Issyk Kul area, Kyrgyzstan)
E.V. Deev1,2, I.V. Turova1,2, A.M. Korzhenkov3,4, D.V. Luzhansky4, A.S. Gladkov5, M.V. Rodkin6, S.V. Abdieva4, I.V. Mazheika7, E.A. Rogozhin3, A.B. Fortuna4, A.M. Muraliev4, T.A. Charimov4, A.S. Yudakhin4
1A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
2Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia
3O.Y. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Bol' shaya Gruzinskaya 10, Moscow, 123995, Russia
4B.N. Eltsyn Kyrgyz-Russian Slavic University, 44 Kiev Str., Bishkek, 720000, Kyrgyzstan
5Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, ul. Profsoyuznaya 84/32, Moscow, 117997, Russia
6Institute of the Earth's Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia
7Nature Research Centre, Vilnius, Lithuania
Keywords: Earthquake, paleoseismology, archaeoseismology, Alabash-Konurolen basin, Northern Tien Shan
Abstract
Paleoseismological and archaeoseismological studies have furnished proof that the northern border of the Alabash-Konurolen basin is thrusting over the basin sediments. The sediments store a record of two earthquakes that occurred between 8400 and 7300 yr BP and presumably in the 16th century. The minimum magnitude of the latter earthquake was estimated, based on the length (2.3 km) of the fault scarp it produced and the amount of displacement (0.4 m) on the respective reverse plane, to range within 6.6-6.8. The older event was of about the same minimum magnitude. The results call for a revision of the existing seismic risk division of Kyrgyzstan that places the Alabash-Konurolen basin into a zone of M ≤ 6.5 seismicity.
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