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Russian Geology and Geophysics

2015 year, number 10

Seismically mobilized moraines in the Tien Shan

A.M. Korzhenkov1, S.V. Abdieva2, A.B. Fortuna3, T.A. Charimov3, A.S. Yudakhin2
1O.Y. Schmidt Institute of Earth Physics, Russian Academy of Sciences, ul. Bol’shaya Gruzinskaya 10, Moscow, 123995, Russia
2B.N. Eltsyn Kyrgyz-Russian Slavic University, 44 Kievskaya Str., Bishkek, 720000, Kyrgyzstan
3Institute of Seismology, National Academy of Sciences of Kyrgyz Republic, 52/1, m-r Asanbay, Bishkek, 720060, Kyrgyzstan
Keywords: Mobilized moraines, prehistoric earthquakes, Chon-Kyzylsuu River, Lake Issyk-Kul, Tien Shan


Moraines studied in the Chon-Kyzylsuu River valley (southeastern Issyk-Kul region, Tien Shan) were mobilized during historic and prehistoric large earthquakes. Seismic triggers of moraine mobilization included the M > 8 Kebin earthquake of 1911 and prehistoric events that produced rockslides, landslides, and multiple fault scarps. Rockslides in the Chon-Kyzylsuu basin are located in the hanging wall of the Terskey border thrust fault. The observed deformation results from at least four prehistoric earthquakes in the second half of the Holocene (early 20th century BC, early 11th century BC, middle 8th century BC, and early 2nd century BC), with local shaking intensity I ≥ 7.