Focal Mechanisms of Earthquakes and Stress Field of the Crust in Mongolia and Its Surroundings

Радзиминович, Н. А.; Баяр, Г.; Мирошниченко, А. И.; Дэмбэрэл, С.; Ulzibat, Munkhuu; Ганзориг, Д.; Лухнев, А. В.

doi:10.5800/gt-2016-7-1-0195

Cited by 32 publications

(8 citation statements)

References 37 publications

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“…The regional earthquake focal mechanisms show strike-slip and thrust displacements in the earthquake foci with the NE and ENE-trending axes of maximum compression (see Fig. 3) [San'kov et al, 2011;Radziminovich et al, 2016]. Thus, the modern state of crustal stresses and the reconstructed paleostress state are characterized by completely different directions of the axis of maximum compression (see Fig.…”

Section: Discussionmentioning

confidence: 97%

Geodynamic conditions for Cenozoic activation of tectonic structures in Southeastern Mongolia

Parfeevets

Sankov

2018

Geodin. tektonofiz.

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The knowledge of the neotectonic structures inSoutheastern Mongolia, that is considerably distant from the active plate boundaries, is important for determining a source of tectonic deformation and regular features of activation in the intracontinental setting. Our research was focused on the East Gobi and South Gobi depressions located inSoutheastern Mongolia, which developed since the Mesozoic and were activated to various degrees in the neotectonic stage. The study aimed to assess the paleostress state of the crust inSoutheastern Mongolia, identify the stages, factors and mechanisms of the Cenozoic activation of the regional structures of different strike, and determine the sources of activation. The analysis of the available literature suggests a similar history of their development in the Late Jurassic – Early Cretaceous (rifting) and Late Cretaceous – Paleogene (tectonic quiescence). In the Cenozoic stage, the depressions experienced activation of completely different styles. In theEast Gobidepression, left-lateral strike-slip faults were activated in the Tertiary, and the post-Late Cretaceous thrusting took place along the northeastern faults on the northern slope of the Totoshan uplift. In the Early Cenozoic, the N-S and N-W compression was dominant as evidenced by the deformed Late Cretaceous sediments and the reconstructed stress tensors typical of the compression and transpression regimes. An overview of the published data suggests that the most probable cause of such deformation was the impact of the Western Pacific zone of plate interaction. However, a potential influence of compression at the early stages of the Indo-Asian collision cannot be completely excluded. TheEast Gobidepression was low active in the second half of the Cenozoic. In contrast to the East Gobi depression, theSouth Gobiactivation began in the Late Cenozoic (Late Miocene – Early Pliocene). Young uplifts and forbergs (Gobi Altai eastern termination) developed actively and ‘cut’ the sediments of the basins originating from the Mesozoic. The W-E and N-W strike-slip and thrust faults were active in the Pliocene–Quaternary. The stress field reconstructions show compression, transpression and strike-slip regimes with the NE-trending axis of compression. Deformation in the East Goby Altay (as well as in Western andSouthwestern Mongolia) is driven by the India-Eurasia collision.

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Section: Discussionmentioning

confidence: 97%

Geodynamic conditions for Cenozoic activation of tectonic structures in Southeastern Mongolia

Parfeevets

Sankov

2018

Geodin. tektonofiz.

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“…Nowadays, the Tunka Basin corresponds to an emerged rift structure. It is located within a transition zone between the present-day compressional deformation of North Mongolia and the extensional one of the central Baikal Rift as attested by the focal mechanisms of earthquakes (Melnikova and Radziminovich, 1998;Radziminovich et al, 2016). Morphotectonic and paleoseismic analyses show that the kinematics of faults controlling the Tunka Basin changed through time.…”

Section: Tectonic Settingmentioning

confidence: 99%

Cryoturbation versus tectonic deformation along the southern edge of the Tunka Basin (Baikal Rift System), Siberia: New insights from an integrated morphotectonic and stratigraphic study

Arzhannikova

Ritz

Larroque

et al. 2020

Journal of Asian Earth Sciences

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Tunka Basin is a broad, emerging basin situated between the Baikal Lake to the east and the the Hövsgöl Lake to the west. The basin is bounded to the north and to the south by the Tunka and the Khamar-Daban mountain ranges, respectively. The Tunka normal fault, located at the southern foothills of the Tunka mountain range, is the main structure that controlled the development of the Tunka Basin during the Neogene. Paleoearthquake-surface ruptures attest of its present activity; and show that its western and eastern terminations are undergoing a tectonic inversion characterized by left-lateral-reverse deformations. The southern edge of the Tunka Basin is classically interpreted as being tectonically controlled. In this paper, we present the results of a geomorphological and stratigraphic analysis within its southwestern and southeastern parts suggesting that there is no active fault affecting the foothills of the Khamar-Daban mountain range. The different features observed in the Quaternary deposits are interpreted to be the result of periglacial processes induced by alternating episodes of permafrost aggradation and degradation during the Holocene. Our study concludes that the Khamar-Daban Range and the Tunka Basin are uplifting together, and that the Tunka and Mondy faults are the two main triggers of regional earthquakes.

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“…вдоль юго-восточного, в Байкальском рифте, так и вдоль юго-западного, в пределах поднятия Восточ-ного Саяна и структур юго-западного фланга Бай-кальской рифтовой системы, ограничений плат-формы. Сейсмологические исследования современ-ного напряженного состояния земной коры по дан-ным о механизмах очагов землетрясений и расчеты обобщенных тензоров современного напряженного состояния [Solonenko et al, 1993;Petit et al, 1996;San'kov et al, 1997;Melnikova, Radziminovich, 1998;Parfeevets et al, 2002;Radziminovich et al, 2016] пока-зывают, что преобладающим типом поля напряже-ний в центральной части Байкальского рифта яв-ляется растяжение в направлении СЗ-ЮВ, в то вре-мя как в Восточном Саяне и в пределах юго-запад-ного фланга Байкальской рифтовой системы пре-обладает сдвиговый тип поля напряжений со сжа-тием в направлении СВ-ЮЗ (рис. 11).…”

Section: современное напряженное состояние земной коры юга сибирской unclassified

“…Исходя из положения максимумов про-стираний разломов, можно придти к выводу, что наиболее вероятное направление оси растяжения было северо-западным (примерно 300-310°). Ре-конструированное напряженное состояние соот-ветствует условиям деформации в пределах Бай-кальского рифта, установленным по геолого-струк-турным [Sherman, Dneprovsky, 1989;Parfeevets, San'kov, 2006;San'kov et al, 1997] и сейсмологиче-ским данным [Solonenko et al, 1993;Petit et al, 1996;Radziminovich et al, 2016]. Можно полагать, что напряжения растяжения, вызывающие формиро-вание Байкальского рифта, воздействуют в каче-стве общего геодинамического фона на краевую часть Сибирской платформы, во многом определяя тип разрывных структур на неотектоническом этапе развития.…”

Section: кайнозойские деформацииunclassified

The M w 4.3 January 17, 2014, earthquake: very rare seismic event on the Siberian platform

et al. 2015

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Abstract:We have studied the structural geology and geomorphology of the fault zones in the junction area of the Angara-Lena uplift and the Predbaikalsky trough. We have analyzed faults and folds and reconstructed paleostresses for this junction area named the Irkutsk amphitheatre. Our study shows that syn-fold (Middle Paleozoic) faults include thrusts, reverse faults and strike-slip faults with reverse components, that occurred due to compression from the neighbouring folded region. Recently, contrary to compression, faulting took place under the conditions of extension of the sedimentary cover: most of these recent faults have been classified as normal faults. In the Late Cenozoic, the platform cover was subjected to brittle and partly plicative deformation due to the NW-SE-trending extension that is most clearly observed in the adjacent Baikal rift. Thus, the divergent boundary between the Siberian block of the North Eurasian plate and the Transbaikalia block of the Amur plate is a zone of dynamic influence, which occupies the area considerably exceeding the mountainous region on the Siberian platform. Important factors of faulting are differentiated vertical movements of the blocks comprising the platform. Such vertical movements might have been related to displacements of brine volumes. In the Late Cenozoic basins, movements along separate faults took place in the Late Pleistocene -Holocene.Key words: Siberian platform; Late Cenozoic stress state; active fault; kinematics GEODYNAMICS & TECTONOPHYSICS P U B L I S H E D B Y T H E I N S T I T U T E O F T H E E A R T H ' S C R U S T S I B E R I A N B R A N C H O F R U S S I A N A C A D E M Y O F S C I E N C E S R e c e n t G e o d y n a m i c s RESEARCH ARTICLEReceived: May 12, 2016 Revised: November 7, 2016 Recommended by S.V. Rasskazov (Guest Editor) Accepted: December 15, 2016For citation : Sankov V.A., Parfeevets A.V., Miroshnichenko A.I., Byzov L.M., Lebedeva M.A., Sankov A.V., Dobrynina А.А., Kovalenko S.N., 2017. Late Cenozoic faulting and the stress state in the south-eastern segment of the Siberian platform.

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Focal Mechanisms of Earthquakes and Stress Field of the Crust in Mongolia and Its Surroundings

Cited by 32 publications

References 37 publications

Geodynamic conditions for Cenozoic activation of tectonic structures in Southeastern Mongolia

Geodynamic conditions for Cenozoic activation of tectonic structures in Southeastern Mongolia

Cryoturbation versus tectonic deformation along the southern edge of the Tunka Basin (Baikal Rift System), Siberia: New insights from an integrated morphotectonic and stratigraphic study

The M w 4.3 January 17, 2014, earthquake: very rare seismic event on the Siberian platform

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