gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2012-3-1-0062gtcrust-152Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSОСОБЕННОСТИ ПОЛЯ НАПРЯЖЕНИЙ АФТЕРШОКОВЫХ ПРОЦЕССОВ ЗЕМЛЕТРЯСЕНИЙ АЛТАЕ-САЯНСКОЙ ГОРНОЙ ОБЛАСТИSPECIFIC FEATURES OF FIELDS OF STRESSES ASSOCIATED WITH AFTERSHOCK PROCESSES IN THE ALTAI-SAYAN MOUNTAINOUS REGIONКучайОльга АнатольевнаKuchayOlga A.

канд. физ.-мат. наук, с.н.с.,

630090, Новосибирск, проспект академика Коптюга, 3

Candidate of Physics and Mathematics, Senior Researcher,

3 Prospect Koptyuga, Novosibirsk, 630090

KuchayOA@ipgg.nsc.ruИнститут нефтегазовой геологии и геофизики им. А.А. Трофимука СО РАНРоссияTrofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of RASRussian Federation201222092015315968Copyright © Кучай О.А., 20152015Кучай О.А.Kuchay O.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/152

Для реконструкции современного поля напряжений за счет афтершоковой последовательности Алтайского (27 сентября 2003 г., М = 7.3, φ=50.061°, λ=87.966°) и Бусийнгольского землетрясений (27 декабря 1991 г. М=6.5 φ=51.1°, λ=98.13°), произошедших в Алтае-Саянской горной области, использовался катакластический метод Ю.Л. Ребецкого [Rebetsky, 1997, 1999, 2003, 2007]. В результате восстановления поля напряжений, полученного за счет афтершоков разных магнитуд, проявилась несоосность в ориентации осей максимальных девиаторных напряжений, которая может свидетельствовать об отсутствии подобия поля напряжений разных масштабных уровней. Поля напряжений по слабым Алтайским и Бусийнгольским афтершоковым последовательностям обнаруживают свойство изменения ориентации осей главных напряжений по разные стороны сдвиговых разрывов. Ориентация осей максимального девиаторного напряжения за счет сильных повторных толчков, соответствующая региональному полю напряжений, не меняется вблизи области плоскости разрыва исследованных сильных землетрясений Алтая и Саян.

The cataclastic method developed by Yu.L. Rebetsky is applied to reconstruct the recent field of stresses related to aftershock sequences of earthquakes that occurred in the Altai-Sayan mountainous region, specifically the Altai earthquake of 27 September 2003 (М=7.3; φ=50.061o; λ=87.966o) and the Busingol earthquake of 27 December 1991 (М=5.0; φ=51.1o; λ=98.13o). Upon reconstruction of the field of stresses from data on aftershocks of different magnitudes, it is revealed that orientations of maximum stresses are misaligned, and this may suggest a lack of similarity of fields of stresses in different scale ranks. The fields of stresses reconstructed from data on sequences of weak aftershocks of the Altai and Busingol earthquakes show changes in orientations of major stress axes at opposite sides of the shear faults under study. The orientation of the maximum deviation stress axes due to strong aftershocks is consistent with the regional field of stresses and does not change in the vicinity of the fault plane associated with the strong earthquakes the Altai and Sayan regions.

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The authors declare that there are no conflicts of interest present.