gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2017-8-4-0328gtcrust-482Research ArticleТЕКТОНОФИЗИКАTECTONOPHYSICSДИАГНОСТИКА МЕТАНЕСТАБИЛЬНОГО СОСТОЯНИЯ СЕЙСМОАКТИВНОГО РАЗЛОМАDIAGNOSTICS OF META-INSTABLE STATE OF SEISMICALLY ACTIVE FAULTБорняковС. А.BornyakovS. A.

Борняков Сергей Александрович, канд. геол.-мин. наук, с.н.с.664033, Иркутск, ул. Лермонтова, 128

Bornyakov, Sergei A., Candidate of Geology and Mineralogy, Senior Researcher128 Lermontov street, Irkutsk 664033; 3 Lenin street, Irkutsk 664003, Russia

bornyak@crust.irk.ruMaЦзиньМаJin

Ма Цзинь, академик Китайской академии наукГосударственная центральная лаборатория динамики землетрясений

No. 1, Hua Yan Li, Chaoyang District, Beijing 100029

Ma, Jin, Academician of Chinese Academy of SciencesState Key Laboratory of Earthquake Dynamics

No. 1, Hua Yan Li, Chaoyang District, Beijing 100029, China

dzjmajin@gmail.comМирошниченкоА. И.MiroshnichenkoA. I.

Мирошниченко Андрей Иванович, канд. геол.-мин. наук, с.н.с.664033, Иркутск, ул. Лермонтова, 128

Miroshnichenko, Andrei I., Candidate of Geology and Mineralogy, Senior Researcher128 Lermontov street, Irkutsk 664033, Russia

mai@crust.irk.ruГуоЮаншуанGuoYanshuang

Гуо Юаншуан, доктор наукГосударственная центральная лаборатория динамики землетрясений, 

No. 1, Hua Yan Li, Chaoyang District, Beijing 100029, China

Guo, Yanshuang, Doctor of ScienceState Key Laboratory of Earthquake Dynamics, I

No. 1, Hua Yan Li, Chaoyang District, Beijing 100029, China

guoyshig@gmail.comСалкоД. В.SalkoD. V.

Салко Денис Владимирович, ведущий инженер664033, Иркутск, ул. Лермонтова, 128

Salko, Denis V., Lead Engineer

128 Lermontov street, Irkutsk 664033, Russia

denis@salko.netЗуевФ. Л.ZuevF. L.

Зуев Фёдор Леонидович, ведущий инженер 

664033, Иркутск, ул. Лермонтова, 128

Zuev, Fyodor L., Lead Engineer 

128 Lermontov street, Irkutsk 664033, Russia

zuev@crust.irk.ruИнститут земной коры СО РАН; Иркутский государственный университетРоссияInstitute of the Earth's Crust, Siberian Branch of RAS; Irkutsk State UniversityRussian FederationИнститут геологии, Администрация по землетрясениям КитаяКитайInstitute of Geology, China Earthquake AdministrationChinaИнститут земной коры СО РАНРоссияInstitute of the Earth's Crust, Siberian Branch of RASRussian Federation20171912201784989998Copyright © Борняков С.А., Ma Ц., Мирошниченко А.И., Гуо Ю., Салко Д.В., Зуев Ф.Л., 20172017Борняков С.А., Ma Ц., Мирошниченко А.И., Гуо Ю., Салко Д.В., Зуев Ф.Л.Bornyakov S.A., Ма J., Miroshnichenko A.I., Guo Y., Salko D.V., Zuev F.L.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/482

На основе результатов лабораторного моделирования процесса сейсмической активизации разлома по механизму «stick-slip» [Ma et al., 2012] показано, что нагруженная система из двух блоков непосредственно перед реализацией импульсной подвижки проходит через метанестабильное динамическое состояние, со стадиями ранней и поздней метанестабильности. В первую стадию процесс смещения одного блока относительно другого начинается в квазикриповом стационарном режиме с медленной релаксацией накопленных на межблоковом контакте напряжений. Во вторую стадию «ускоренного синергизма» скорость смещения существенно возрастает и впоследствии через процесс самоорганизации и лавинообразного объединения многочисленных активизированных сегментов межблокового контакта переходит в динамическую импульсную подвижку. С учетом этих экспериментальных выводов анализируются результаты спектрального анализа данных деформационного мониторинга, проведенного в пределах южной оконечности оз. Байкал, где 27.08.2008 г. произошло Култукское землетрясение (Ms=6.1). Его эпицентр располагался в южном окончании зоны Главного Саянского разлома. Мониторинг деформаций горных пород проводился с апреля по ноябрь2008 г. в штольне, расположенной в30 км от эпицентра землетрясения. Временной ряд данных был разделен на тридцатидневные интервалы, которые обрабатывались методом спектрального анализа. Результаты расчетов показали, что перед землетрясением спектрограмма имеет упорядоченный вид, тогда как в другие временные интервалы, как до, так и после землетрясения такая упорядоченность в спектрограммах отсутствует. Такой упорядоченный вид спектрограммы для данных деформационного мониторинга может интерпретироваться как следствие самоорганизации деформационного процесса при переходе сейсмоактивного разлома в метанестабильное состояние перед Култукским землетрясением.

Based on the results of a laboratory simulation of the seismic fault reactivation by “stick-slip” process, it was shown that the system of two blocks just before an impulse offset goes through the meta-instable dynamic state, with early and late stages of meta-instability [Ma et al., 2012]. In the first stage the offset begins in slow stationary mode with slow stresses relaxation on contact between blocks. In the second stage of the “accelerated synergies” strain rate increases and, subsequently, the deformation process through a process of self-organization came to dynamic impulse offset. The experimental results were used for interpretation of the results of spectral analysis of the deformation monitoring data. The data were held within the southern part ofLakeBaikal, where Kultuk earthquake (27.08.2008, Ms=6.1). took place. Its epicenter was located in the South end zone of the main Sayan fault. Monitoring of deformations of rocks was carried out from April to November2008 in tunnel, located at30 km from the epicenter of the earthquake. The time series data was divided into month periods and then the periods were processed by the method of spectral analysis. The results showed that before the earthquake has ordered view spectrogram, whereas in other time intervals, both before and after the earthquake such orderliness in spectrograms is missing. An ordered view spectrograms for deformation monitoring data can be interpreted as a consequence of the self-organiza­tion of deformation process in the transition of seismically active fault into meta-unstable before the Kultuk earthquake.

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