Seismic-hazard assessment for Ulaanbaatar (<i>Mongolia</i>) on the basis of seismogeological studies

Imaev, V. S.; Smekalin, O. P.; Strom, Alexander; Chipizubov, A. V.; Syasko, A. A.

doi:10.1016/j.rgg.2012.07.006

Cited by 14 publications

(7 citation statements)

References 3 publications

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“…Ранее по результатам тренчинговых исследований 2010-2012 г. нами были определены абсолютный возраст палеоземлетрясений в зонах сейсмо-генерирующих Гунжинского и Хустайского разломов [Imaev et al, 2012;Smekalin et al, 2013]. И, хотя в разрезах канав нами устанавливались следы как минимум двух разрывообразующих событий, получить абсолютный возраст радиоуглеродным методом нам удавалось лишь для самых последних событий.…”

Section: возраст и магнитуды палеоземлетрясенийunclassified

Seismogeology of Verkhnekerulen Basin (Khentei, Northern Mongolia)

Smekalin¹,

Chipizubov²,

Imaev³

2016

Geodin. tektonofiz.

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The paper presents results of seismogeological studies of active faults bordering the Upper Kerulen basin, one of the largest intermountain basins of the Khentei upland. Morphometric and trenching methods were applied to estimate the main parameters of seismogenic dislocations and associated Holocene palaeoearthquakes (540-2810, 3170-3720, and 7480-9220 years ago). The maximum palaeoearthquake magnitude (7.5) characterizes the seismic capacity of the potential focal area (PFA) confined to the Kerulen fault. The new data show the need to revise the potential seismicity concepts of the southern Khentey area and to make appropriate changes in the general seismic zoning maps. The relationship between the dislocations and the modern topography features, as well as deformation of the subsurface sediments in the studied mine openings give evidence of thrusting under the sub-lateral to northwestern subhorizontal compression.

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Section: возраст и магнитуды палеоземлетрясенийunclassified

Seismogeology of Verkhnekerulen Basin (Khentei, Northern Mongolia)

Smekalin¹,

Chipizubov²,

Imaev³

2016

Geodin. tektonofiz.

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“…Up arrow marks the sample from the bed deformed during the earthquake, and down arrow marks the sample from the bed overlying seismogenic sediments. The time of the last renewal of the Hustai and Gunji dislocations is given after Imaev et al (2012) and Smekalin et al (2013).…”

Section: Trenchingmentioning

confidence: 99%

“…From the results of earlier trenching studies (2010-2012) we estimated the absolute age of paleoearthquakes in the zones of the seismogenic Gunji and Hustai Faults (Imaev et al, 2012;Smekalin et al, 2013). Despite the detected traces of at least two rupturing events in the trench sections, we succeeded in radiocarbon dating of only the most recent ones.…”

Section: The Age Of Paleoevents In the South Of The Henteyn Upliftmentioning

confidence: 99%

Paleoseismogenic dislocations in the Upper Kerulen basin (southern Henteyn–Daurian mega-arch)

Smekalin

Chipizubov

Imaev

2015

Russian Geology and Geophysics

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In recent years, the Hustai, Gunji, and Kerulen paleoseismogenic structures have been discovered and examined within the Henteyn uplift. Their investigations revealed zones of probable earthquake foci, presenting a seismic hazard for Ulaanbaatar. We report the first data on the quantitative parameters of prehistoric earthquakes in the Meso-Cenozoic Upper Kerulen basin. The absolute age of two paleoevents determined by radiocarbon dating is within 1152-1702 BC and 5466-7201 BC. Seismogeological study of dislocations made it possible to estimate the type of tectonic stress during the formation of structures within the Henteyn uplift and to explain their nature. The horizontal-compression stress is mostly due to endogenous processes, which lead to the enlargement of the uplift area at the expense of the peripheral Mesozoic sedimentary basins.

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“…Gunj fault: Located ~ 15 km north-east from Ulaanbaatar, it has a length of ~ 20 km and is oriented N45°. It is 60 associated with right-lateral displacement, vertical component and flower structures (Imaev et al, 2012).…”

mentioning

confidence: 99%

Tectonic Geomorphology and Paleoseismology of the Sharkhai fault: a new source of seismic hazard for Ulaanbaatar (Mongolia)

Al-Ashkar

Schlupp

Ferry

et al. 2021

Preprint

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Abstract. We present new constraints from tectonic geomorphology and paleoseismology along the newly discovered Sharkhai fault near the capital city of Mongolia. Detailed observations from high resolution Pleiades satellite images and field investigations allowed us to map the fault in detail, describe its geometry and segmentation, characterize its kinematics, and document its recent activity and seismic behavior (cumulative displacements and paleoseismicity). The Sharkhai fault displays a surface length of ~40 km with a slightly arcuate geometry, and a strike ranging from N42° E to N72° E. It affects numerous drainages that show left-lateral cumulative displacements reaching 57 m. Paleoseismic investigations document the faulting and deposition record for the last ~3000 yr and reveal that the penultimate earthquake (PE) occurred between 1515 ± 90 BC and 945 ± 110 BC and the most recent event (MRE) occurred after 860 ± 85 AD. The resulting time interval of 2080 ± 470 years is the first constraint on the Sharkhai fault for large earthquakes. On the basis of our mapping of the surface rupture and the resulting segmentation analysis, we propose two possible scenarios for large earthquakes with likely magnitudes between 6.4 ± 0.2 and 7.1 ± 0.2. Furthermore, we apply scaling laws to infer coseismic slip values and derive preliminary estimates of long-term slip rates between 0.2 ± 0.2 and 1.0 ± 0.5 mm/y. Finally, we propose that these original observations and results from a newly discovered fault should be taken into account for the seismic hazard assessment for the city of Ulaanbaatar and help build a comprehensive model of active faults in that region.

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Seismic-hazard assessment for Ulaanbaatar (Mongolia) on the basis of seismogeological studies

Cited by 14 publications

References 3 publications

Seismogeology of Verkhnekerulen Basin (Khentei, Northern Mongolia)

Seismogeology of Verkhnekerulen Basin (Khentei, Northern Mongolia)

Paleoseismogenic dislocations in the Upper Kerulen basin (southern Henteyn–Daurian mega-arch)

Tectonic Geomorphology and Paleoseismology of the Sharkhai fault: a new source of seismic hazard for Ulaanbaatar (Mongolia)

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