gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2019-10-1-0403gtcrust-768Research ArticleТЕКТОНОФИЗИКАTECTONOPHYSICSСРАВНЕНИЕ МОДЕЛИ КОСОГО РИФТИНГА И ДЕФОРМАЦИЙ ТРАНСФЕРНОЙ ЗОНЫ, РАСПОЛОЖЕННОЙ В СЕВЕРНОМ СЕГМЕНТЕ РИФТА ФЕН-ВЕЙ: ПОСЛЕДСТВИЯ РОЯ ЗЕМЛЕТРЯСЕНИЙ 1989 ГОДА В РАЙОНЕ ДАТУН- ЯНГГАО (КИТАЙ)A TEST OF THE OBLIQUE-RIFTING MODEL FOR TRANSFER ZONE DEFORMATION IN THE NORTHERN FEN-WEI RIFT: IMPLICATIONS FROM THE 1989 M 6.1 DATONG-YANGGAO EARTHQUAKE SWARMЧжоЯн-ЦюньZhuoYan-Qun

Ян-Цюнь Чжо - PhD

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

Yan-Qun Zhuo - PhD of Geophysics, Assistant Professor

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

zhuoyq@ies.ac.cnГоЯншуанGuoYanshuang

Яншуан Го A- ssistant Professor

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

Yanshuang Guo - Assistant Professor

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

guoysh@ies.ac.cnhttps://orcid.org/0000-0002-5119-1092БорняковС. А.BornyakovS. A.

Сергей Александрович Борняков - кандидат геолого-минералогических наук, старший научный сотрудник

664033, Иркутск, ул. Лермонтова, 128

Sergey A. Bornyakov - Candidate of Geology and Mineralogy, Senior Researcher

128 Lermontov street, Irkutsk 664033

bornyak@crust.irk.ruМаЦзиньMaJin

Цзинь Ма - академик

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

Jin Ma - Academician of Chinese Academy of Sciences, Professor

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

majin@ies.ac.cnГосударственная лаборатория динамики землетрясений, Институт геологии, Администрация по землетрясениям КитаяКитайState Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake AdministrationChinaИнститут земной коры СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of RASRussian Federation2019210320191014351Copyright © Чжо Я., Го Я., Борняков С.А., Ма Ц., 20192019Чжо Я., Го Я., Борняков С.А., Ма Ц.Zhuo Y., Guo Y., Bornyakov S.A., Ma J.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/768

Эволюция рифта Фен-Вей происходит под влиянием косого рифтинга, как показывают тектонофизические эксперименты. В данном исследовании основная особенность модели состоит в том, что западные и восточные границы трансферной зоны между соседними впадинами СВВ простирания, образовавшимися вследствие растяжения, имеют тенденцию к образованию правосторонних сдвигов с незначительной сбросовой компонентой как результат взаимодействия между указанными впадинами под влиянием косого рифтинга. Современная деформация рифта Фен-Вей может быть установлена путем проверки характеристики, предсказанной экспериментально. Нами были проанализированы решения по смещениям и механизмам очага землетрясения М=6.1 1989 года в районе Датун-Янггао – сильнейшего землетрясения в рифте Фен-Вей за последние 200 лет. Анализ показал, что трансферная зона между бассейнами Яньюань и Хуньюань ограничена сдвигами ССВ простирания с незначительной сбросовой компонентой на восточной и западной окраинах данной зоны. Установленное в нашем исследовании соответствие между изученной моделью и современной тектонической активностью в изучаемом районе подтверждает, что косой рифтинг по-прежнему играет важную роль в современных деформациях северной части рифта Фен-Вей.

 

Tectonophysical experiments show that the evolution of the Fen-Wei Rift is controlled by oblique rifting. A key characteristic of the model in our study is that the western and eastern borders of the transfer zone between the adjacent NEE-striking extensional basins tend to form right-lateral strike-slip faults with slight normal slip as a result of the interaction between the adjacent NEE-striking extensional basins under oblique rifting. The current deformation of the Fen-Wei Rift can be clarified by testing this predicted deformation characteristic. Our analysis of the relocation and focal mechanism solutions of the 1989 M 6.1 Datong-Yanggao earthquake swarm, which was the largest earthquake that occurred in the Fen-Wei Rift in the last 200 years, suggests that the transfer zone between the Yangyuan and Hunyuan basins is bounded by the NNE-striking right-lateral strike-slip faults with slight normal slip at its eastern and western edges. This consistency between the model and the current tectonic activity in the study area indicates that oblique rifting still plays an important role in the current deformation of the northern Fen-Wei Rift.

модель косого рифтингасовременная тектоническая активностьтрансферная зонарешения механизмов очагов землетрясенийперемещение землетрясенийOblique rifting modelcurrent tectonic activitytransfer zonefocal mechanism solutionearthquake relocationThis work was supported by the National Natural Science Foundation of China (Grant Nos. 41572181, 41211120180 and 41702226) and the Russian Fund for Basic Research (Grant No. 12- 05-91161-GFEN-a)ReferencesAanyu K., Koehn D., 2011. Influence of pre-existing fabrics on fault kinematics and rift geometry of interacting segments: analogue models based on the Albertine Rift (Uganda), Western Branch-East African Rift System. Journal of African Earth Sciences 59 (2–3), 168–184. https://doi.org/10.1016/j.jafrearsci.2010.10.003.Aanyu K., Koehn D., 2011. Influence of pre-existing fabrics on fault kinematics and rift geometry of interacting segments: analogue models based on the Albertine Rift (Uganda), Western Branch-East African Rift System. 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The authors declare that there are no conflicts of interest present.