gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2020-11-3-0490gtcrust-1085Research ArticleТЕКТОНОФИЗИКАTECTONOPHYSICSПозднечетвертичные смещения вдоль Сарминского участка Приморского разлома по данным георадиолокации (Байкальский рифт)Late Quarternary displacements along the Sarma segment of the Primorsky fault based on gpr survey data (Baikal rift)ДенисенкоИ. А.DenisenkoI. A.

664033, Иркутск, ул. Лермонтова, 128.

 

Ivan A. Denisenko.128 Lermontov St, Irkutsk 664033.

denisenkoivan.1994@mail.ruЛунинаО. В.LuninaO. V.

664033, Иркутск, ул. Лермонтова, 128.

 

128 Lermontov St, Irkutsk 664033.

 

Институт земной коры СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesRussian Federation202023092020113548565Copyright © Денисенко И.А., Лунина О.В., 20202020Денисенко И.А., Лунина О.В.Denisenko I.A., Lunina O.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/1085

Рассмотрены результаты георадиолокационных исследований активизированного в раннем голоцене участка Приморского разлома в районе р. Сарма между населенными пунктами Шида и Курма. Целью данной работы является реконструкция вертикальных амплитуд смещений и углов падения разрывов вдоль активизированного в позднечетвертичное время участка Приморского разлома для уточнения его кинематического типа и максимальной магнитуды землетрясения, которое может иметь место в зоне одной из крупнейших структур Байкальского рифта.

Работы выполнялись георадаром ОКО-2 с экранированной антенной АБ-250М и АБДЛ-Тритон. В дополнение к основному методу использовались морфоструктурные и тектонофизические методы. В результате выполненных работ на основе интерпретации данных геофизических исследований и дешифрирования спутниковых снимков, доступных через Web-сервисы, были откартированы разрывные нарушения, ассоциированные с палеосейсмодислокацией Сарма. Общая протяженность откартированных разрывов составила не менее 14 км. Полученные на основе георадиолокационных данных одноактные вертикальные смещения по сейсморазрыву имеют сбросовую кинематику и изменяются с ЮЗ на СВ с 4.4 до 7.7 м. Магнитуды палеоземлетрясения, рассчитанные по максимальному вертикальному смещению, равны Mw=7.2 и Мs=7.4, что дает право предполагать более значительное по силе землетрясение, которое может иметь место в зоне Приморского разлома, чем считалось ранее.

 

Ground-penetrating radar (GPR) surveys were performed in the Sarma segment of the Primorsky fault between the settlements of Shida and Kurma. This segment belongs to one of the largest structures of the Baikal rift and was active in Late Quaternary (Early Holocene). The study aimed to reconstruct vertical displacement amplitudes and dip angles of fractures along the fault segment, clarify its kinematic type, and estimate a maximum magnitude of earthquakes that may occur in the study area. The GPR equipment set included an OKO-2 georadar and AB-250M and ABDL-Triton shielded antennas. The GPR surveys were supported by morphostructural and tectonophysical methods. Based on the interpretation of the geophysical survey data and satellite images, faults associated with the Sarma paleoseismic dislocation were mapped. Their total length amounts to 14 km. According to the GPR survey data, one-stage vertical displacements show normal faulting and vary from SW to NE from 4.4 to 7.7 m. Paleo-earthquake magnitudes calculated from the maximum displacement values (Mw=7.2, and Мs=7.4) suggest that potential earthquakes in the Primorsky fault zone may be stronger than previously assumed.

 

Приморский разломгеорадиолокациясмещениепалеосейсмодислокация СармаPrimorsky faultground-penetrating radar (GPR)displacementSarma paleoseismic dislocationПолевые структурно-геологические исследования выполнялись в рамках базового проекта № 0346-2018-0003 «Тектонофизика современных геодинамических процессов в литосфере Центральной Азии как основа прогноза чрезвычайных ситуаций природного характера». Георадиолокационные исследования выполнены при поддержке РФФИ в рамках научного проекта № 19-35-90003 «Структура активных разломов Байкальского рифта и их параметризация по данным георадиолокации».The field geostructural studies were carried out as part of project 0346-2018-0003 – Tectonophysics of modern geodynamic processes in the lithosphere of Central Asia as the basis for forecasting natural emergencies. 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The authors declare that there are no conflicts of interest present.