gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2019-10-1-0407gtcrust-772Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSСОВРЕМЕННЫЕ ДВИЖЕНИЯ ЗЕМНОЙ ПОВЕРХНОСТИ ГОРНОГО АЛТАЯ ПО GPS-НАБЛЮДЕНИЯМMODERN MOVEMENTS OF THE CRUST SURFACE IN GORNY ALTAI FROM GPS DATAТимофеевВ. Ю.TimofeevV. Yu.

Владимир Юрьевич Тимофеев - доктор физико-математических наук, заведующий лабораторией

630090, Новосибирск, пр. Академика Коптюга, 3

Vladimir Yu. Timofeev - Doctor of Physics and Mathematics, Head of Laboratory 

3 Academician Koptug ave., Novosibirsk 630090

timofeevvy@ipgg.nsc.ruАрдюковД. Г.ArdyukovD. G.

Дмитрий Геннадьевич Ардюков - кандидат физико-математических наук, старший научный сотрудник

630090, Новосибирск, пр. Академика Коптюга, 3

Dmitriy G. Ardyukov - Candidate of Physics and Mathematics, Senior Researcher 

3 Academician Koptug ave., Novosibirsk 630090

ardyukovdg@ipgg.nsc.ruТимофеевА. В.TimofeevA. V.

Антон Владимирович Тимофеев - кандидат физико-математических наук, научный сотрудник

630090, Новосибирск, пр. Академика Коптюга, 3

3 Academician Koptug ave., Novosibirsk 630090

timofeevav@ipgg.nsc.ruБойкоЕ. В.BoikoE. V.

Елена Валерьевна Бойко - кандидат физико-математических наук, научный сотрудник

630090, Новосибирск, пр. Академика Коптюга, 3

Elena V. Boiko Candidate of Physics and Mathematics, Researcher 

3 Academician Koptug ave., Novosibirsk 630090

boykoev@ipgg.nsc.ruИнститут нефтегазовой геологии и геофизики им. А.А. Трофимука СО РАНРоссияA.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of RASRussian Federation201921032019101123146Copyright © Тимофеев В.Ю., Ардюков Д.Г., Тимофеев А.В., Бойко Е.В., 20192019Тимофеев В.Ю., Ардюков Д.Г., Тимофеев А.В., Бойко Е.В.Timofeev V.Y., Ardyukov D.G., Timofeev A.V., Boiko E.V.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/772

Технология космической геодезии впервые использована для изучения межсейсмических, косейсмических и постсейсмических процессов в земной коре Горного Алтая с 2000 по 2017 г. Показано место Горного Алтая в полях смещений и деформаций Азии. Получены поля 3D смещений перед Чуйским землетрясением (27.09.2003г., М=7.3), произошедшим в южной части Алтайской GPS-сети (от 49° до 55° с.ш. и от 81° до 89° в.д.). Выделено аномальное поведение в ориентации смещений, в распределении скоростей и деформаций в зоне будущего землетрясения. В эпоху косейсмических смещений получено распределение смещений, соответствующее правостороннему сдвигу на вертикальном разрыве. С использованием экспериментальных данных (изменение смещения от 0.3 м в 14 км от разрыва до 0.02 м в 84 км) и упругой модели получена оценка глубины разрыва (8–10 км). Исследовано поле косейсмических деформаций. Для постсейсмического этапа (2004–2017 гг.) выделяются смещения в эпицентральной зоне. Они повторяют правостороннее движение (скорость 2 мм/год) на разрыве, что позволило рассмотреть двухслойные вязкоупругие модели, оценить вязкость нижней коры (6×1019–3×1020 Па×с) и мощность упругой верхней (25 км). Проанализированы современные движения Горного Алтая вне области Чуйского землетрясения. Величина современных горизонтальных смещений составила 1.1 мм/год при направлении на ССЗ (–30°). Скорость смещения оказалась более чем в два раза меньше значений скоростей перед землетрясением.

 

In 2000–2017, the GPS technology was first applied to study inter-seismic, co-seismic and post-seismic processes in the crust of the Altai Mountains (Gorny Altai). Our study aims at investigating the fields of displacement and deformation in the Gorny Altai region as a part of Asia.The 3D displacement fields are reconstructed for the period before the M 7.3 Chuya earthquake that occurred in the southern sector of the Altai GPS network (49° to 55°N, and 81° to 89°E)on 27 September 2003.Anomalous behavior features are discovered in the displacement orientations, as well as in the distribution of velocities and deformation in the zone of the future earthquake.The spatial displacement pattern defined for the period of co-seismic displacements corresponds to the right-lateral strike-slip along the vertical fault. The fault depth is estimated using the elastic model and the experimental data (change in displacement from 0.30 m to 0.02 m at the distances of 14 km and 84 km from the fault, respectively); it amounts to 8–10 km.The co-seismic deformation field is investigated.In the post-seismic stage (2004–2017), displacements revealedin the epicentral zone show the right-lateral strike-slip along the fault at the rate of 2 mm/yr. Therefore, two-layer viscoelastic models can be considered. The estimated viscosity of the lower crust ranges from 6×1019 to 3×1020Pa×s, and the elastic upper crust thickness is 25 km. Analyzed are modern movements in the Gorny Altai region outside the Chuya earthquake area.The results of our study show that modern horizontal displacements occur in the NNW direction at the rate of 1.1 mm/yr, which is twice lower than the displacement rate before the earthquake.

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