Seismically mobilized moraines in the Tien Shan |
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| Institution: | 1. O.Y. Schmidt Institute of Earth Physics, Russian Academy of Sciences, ul. Bol’shaya Gruzinskaya 10, Moscow, 123995, Russia;2. B.N. Eltsyn Kyrgyz-Russian Slavic University, 44 Kievskaya Str., Bishkek, 720000, Kyrgyzstan;3. Institute of Seismology, National Academy of Sciences of Kyrgyz Republic, 52/1, m-r Asanbay, Bishkek, 720060, Kyrgyzstan;1. The University of Texas at Austin, Jackson School of Geosciences, USA;2. Tulane University, Department of Earth and Environmental Sciences, New Orleans, LA 70118, USA;1. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (Universidad de Buenos Aires-CONICET), Laboratorio de Neotectónica, C1428EHA, Buenos Aires, Argentina;2. Swiss Federal Institute of Technology of Zurich (ETHZ), Geological Institute, CH-8092 Zurich, Switzerland;3. Instituto de Estudios Andinos “Don Pablo Groeber” (IDEAN, Universidad de Buenos Aires-CONICET) , Laboratorio de Tectónica Andina, C1428EHA, Buenos Aires, Argentina |
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| Abstract: | Moraines studied in the Chon-Kyzylsuu River valley (southeastern Lake 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. |
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