gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2019-10-4-0454gtcrust-943Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSСООТНОШЕНИЕ НАПРЯЖЕННОГО СОСТОЯНИЯ ЗЕМНОЙ КОРЫ, СЕЙСМИЧНОСТИ И ОПОЛЗНЕВОЙ АКТИВНОСТИ (НА ПРИМЕРЕ ФЕРГАНСКОЙ ВПАДИНЫ, ТЯНЬ‐ШАНЬ)CORRELATION OF THE STATE OF CRUSTAL STRESSES, SEISMICITY AND LANDSLIDE ACTIVITY (FERGANA BASIN, TIEN SHAN)https://orcid.org/0000-0001-5172-3741КальметьеваЗ. А.Kalmet’evaZ. A.

канд. физ.-мат. наук, с.н.с.,

720027, Бишкек, ул. Тимура Фрунзе, 73/2

Candidate of Physics and Mathematics, Senior Researcher,

73/2 Timur Frunze street, Bishkek 720027

z.kalmetyeva@caiag.kghttps://orcid.org/0000-0002-9845-2675МолдобековБ. Д.MoldobekovB. D.

канд. геол.-мин. наук, содиректор,

720027, Бишкек, ул. Тимура Фрунзе, 73/2

Candidate of Geology and Mineralogy, co-Director,

73/2 Timur Frunze street, Bishkek 720027

b.moldobekov@caiag.kghttps://orcid.org/0000-0001-7591-1042АбдыбачаевУ. А.AbdybachaevU. A.

720027, Бишкек, ул. Тимура Фрунзе, 73/2

73/2 Timur Frunze street, Bishkek 720027

u.abdybachaev@caiag.kgЦентрально‐Азиатский институт прикладных исследований ЗемлиКыргызстанCentral‐Asian Institute for Applied GeosciencesKyrgyzstan2019101220191049951009Copyright © Кальметьева З.А., Молдобеков Б.Д., Абдыбачаев У.А., 20192019Кальметьева З.А., Молдобеков Б.Д., Абдыбачаев У.А.Kalmet’eva Z.A., Moldobekov B.D., Abdybachaev U.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/943

Наши исследования были начаты в 2010 году [Kalmetyeva et al., 2010] с целью изучения влияния сейсмичности на оползневую активность в Кыргызстане. Однако в процессе исследований [Kalmetyeva, Moldobekov, 2012, 2013; Kalmetyeva et al., 2013, 2014] формулировка поставленной изначально задачи несколько изменилась, а именно: влияют ли землетрясения на возникновение оползней и, если да, то каков механизм этого воздействия. Настоящее сообщение является завершающим в решении поставленной задачи. Приводятся результаты более детального рассмотрения пространственно‐временного распределения оползней и землетрясений в сопоставлении с данными о механизмах очагов (азимут и угол погружения главной оси напряжения сжатия Р) этих землетрясений для территории Ферганской впадины и ее горного обрамления. Проведенный анализ позволяет сделать предположение, что решающее значение в оползневой активности имеет реакция внутренней структуры земной коры на локальные напряжения. Механизм воздействия сильных землетрясений на активизацию оползней состоит в перераспределении локальных напряжений, которое происходит в результате высвобождения некоторой части региональных напряжений, связанных с образованием разрыва в очаге сильного землетрясения. Такое представление об оползневой активности показывает, что основные направления исследований по разработке методики составления карт оползневой опасности должны состоять в следующем: районирование территории по внутренней структуре верхних частей земной коры (1), установка пунктов инструментальных наблюдений за движением оползней на участках территории с различающейся структурой верхних частей земной коры (2), изучение напряженного состояния территории методами геологии, геофизики, сейсмологии (3), анализ подготовки и последствий прошлых сильных землетрясений в сопоставлении с оползневой активностью (4).

The impacts of seismicity on the landslide activity in Kyrgyzstan have been in the focus of our study since 2010 [Kalmetyeva et al., 2010]. As the study progressed [Kalmetyeva, Moldobekov, 2012, 2013; Kalmetyeva et al., 2013, 2014], the initial problem statement has been revised as follows: do earthquake influence the occurrence of land‐ slides, and, if so, what is the mechanism of this influence. This paper presents the results of detailed analysis of the distribution of earthquakes and landslides in space and time in correlation with focal mechanisms (azimuth and plunge of the principal compression stress axis) of earthquakes occurred in the Fergana basin and its mountainous frame. These are grounds to conclude that the landslide activity is mainly influenced by the response of the internal structure of the upper crust to local stresses. The mechanism of influence of strong earthquakes on the landslide activity is redistribution of local stresses, which results from partial release of regional stresses due to rupturing in the source zones of strong earthquakes. Using this concept of the landslide activity, a methodology of landslide‐hazard mapping is the goal of our future studies aimed at the following: (1) zoning of the study area with respect to the features of the internal structure of the upper crust, (2) geological, geophysical and seismological studies of the state of stresses in the study area, (3) instrumental monitoring of landslides movements in the zones that differ in the structure of the upper crust, and (4) analysis of preparation and consequences of past strong earthquakes that took place in the study area in comparison with the landslide activity.

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