The system of neotectonic faults in southeastern Altai: orientations and geometry of motion
I.S. Novikova, A.A. Emanovb, c , E.V. Leskova b, c,, V.Yu. Batalev d , A.K. Rybin d , E.A. Bataleva d
a Institute of Geology and Mineralogy, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
b Geophysical Surveys of the Siberian Branch of the RAS, Altai-Sayan Department, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
c Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
d Bishkek Science Station of the RAS, Bishkek, 720049, Kyrgyzstan
Keywords: Altai neotectonics; Cenozoic orogeny; seismology; earthquake mechanisms; seismic tomography; magnetotelluric soundings
Pages: 859-867
Abstract
The implications of recent seismological and resistivity data for the geometry and orientations of neotectonic faults are generally consistent with the morphotectonic model of Gorny Altai as an area of crustal failure at the junction of two relatively stable blocks. The model predicts motions under general NW compression mainly on right-lateral strike-slip faults accompanied by systems of pinnate reverse and extensional faults.
The locations and mechanisms of aftershocks that followed the 2003 Chuya earthquake (Gorny Altai) indicate long seismic activity generated by a neotectonic NW right-lateral strike-slip fault which separates the North Chuya and South Chuya ranges from the Kurai-Chuya system of intermontane basins. The plane of the northwestern termination of the active fault zone dips in the SE direction, beneath the ranges, at about 70
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