Geodynamic Activity of Modern Structures and Tectonic Stress Fields in Northeast Asia

Имаева, Л. П.; Гусев, Г. С.; Imaev, V. S.; Ашурков, С. В.; Мельникова, В. И.; Середкина, А. И.

doi:10.5800/gt-2017-8-4-0315

Cited by 18 publications

(10 citation statements)

References 38 publications

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“…The study territory is the region where the Northern Hemisphere's "pole of cold" is located. The absolute minimum there has reached record levels for the Northern Hemisphere: down as far as −71 • C in Oymyakon and −68 • C in Verkhoyansk (Ivanova, 2006). The research region's climate is distinctly continental.…”

Section: Climatementioning

confidence: 95%

Warming temperatures are impacting the hydrometeorological regime of Russian rivers in the zone of continuous permafrost

et al. 2019

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Abstract. Large Arctic river basins experience substantial variability in climatic, landscape, and permafrost conditions. However, the processes behind the observed changes at the scale of these basins are relatively poorly understood. While most studies have been focused on the “Big 6” Arctic rivers – the Ob', Yenisey, Lena, Mackenzie, Yukon, and Kolyma – few or no assessments exist for small and medium-sized river basins, such as the Yana and Indigirka River basins. Here, we provide a detailed analysis of streamflow data from 22 hydrological gauges in the Yana and Indigirka River basins with a period of observation ranging from 35 to 79 years up to 2015. These river basins are fully located in the zone of continuous permafrost. Our analysis reveals statistically significant (p<0.05) positive trends in the monthly streamflow time series during the autumn–winter period for most of the gauges. The streamflow increases in a stepwise pattern (post-1981) for 17 out of 22 gauges in September (average trend value for the period of record is 58 % or 9.8 mm) and 15 out of 22 gauges in October (61 % or 2.0 mm). The positive trends are seen in 9 out of 19 rivers that do not freeze in November (54 %, 0.4 mm) and 6 out of 17 rivers that do not freeze in December (95 %, 0.15 mm). Precipitation is shown to decrease in late winter by up to 15 mm over the observational period. Additionally, about 10 mm of precipitation that used to fall as snow at the beginning of winter now falls as rain. Despite the decrease in winter precipitation, no decrease in streamflow has been observed during the spring freshet in May and June in the last 50 years (from 1966); moreover, five gauges show an increase of 86 % or 12.2 mm in spring floods via an abrupt change in 1987–1993. The changes in spring freshet start date are identified for 10 gauges; the earlier onset in May varies from 4 to 10 d over the observational period. We conclude that warmer temperatures due to climate change are impacting the hydrological regime of these rivers via changes in precipitation type (rain replacing snow). Other factors, such as the melting of permafrost, glaciers, and aufeis or changes in groundwater conditions, are likely to contribute as well; however, no direct observations of these changes are available. The changes in streamflow can have a significant impact on the ecology of the zone of continuous permafrost, while the increasing freshwater fluxes to the Arctic Ocean can impact the Arctic thermohaline circulation.

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Section: Climatementioning

confidence: 95%

Warming temperatures are impacting the hydrometeorological regime of Russian rivers in the zone of continuous permafrost

et al. 2019

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“…Focal mechanism solutions for this zone are varying, as well as the fault kinematics, including normal, reverse, and strike-slip faults, and their modifications. The analysis of seismotectonic deformation structures shows the dominance of crustal stretching with a small shear component [6,7]. The extension stress azimuth in this zone differs in orientation from that of the Laptev Sea Rift.…”

Section: Seismotectonics Of Laptev Sea Segmentmentioning

confidence: 87%

“…Seismotectonic studies are based on the concept of the structural and dynamic uniformity of the geophysical medium and regularities in the development of seismogeodynamic processes, which is elaborated by the Institute of Physics of the Earth of the Russian Academy of Sciences (IPE RAS) [4,5] and developed in [1][2][3]6,7]. The research method used in our studies of the Russian Arctic includes several stages.…”

Section: Methodsmentioning

confidence: 99%

“…Modern (Late Cenozoic) structures in the study area are analyzed considering the recent tectonics as a structural framework comprising active faults and other features of modern tectonic activity related to regional seismicity. Neotectonic structures of the Russian Arctic are ranked by their degree of activity, according to the regional principles of the classification described in [6,7].…”

Section: Methodsmentioning

confidence: 99%

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Dynamics of the Zones of Strong Earthquake Epicenters in the Arctic–Asian Seismic Belt

2019

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Our comprehensive study of the Russian Arctic region aims to clarify the features and types of seismotectonic deformation of the crust in the Arctic–Asian Seismic Belt, specifically in the zones of strong earthquakes in the Laptev Sea Segment, the Kharaulakh Segment, and the Chersky Seismotectonic Zone. We have analyzed modern tectonic structures and active fault systems, as well as tectonic stress fields reconstructed by tectonophysical analysis of the Late Cenozoic faults and folds. The investigated neotectonic structures are ranked with respect to the regional classification principles. Changes in the crustal stress–strain state in the lithospheric plate boundaries between the Eurasian, North American, and Okhotsk Sea Plates are analyzed, and regularities of such changes are discovered. A set of models has been constructed for the studied segments of plate boundaries with account of the dynamics of the regional geological structures. The models can give a framework for the assessment of potential seismic risks of seismogenerating structures in the Russian Arctic region.

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“…Таким образом, ХЛЗ представляет собой геодинамическую границу с комбинированной кинематикой. В современном плане к ней приурочены эпицентры некоторых землетрясений [26] и, кроме того, мощные и множественные прорывы метана [8]. Судя по тектонической позиции, унаследованности, протяженности и эшелонированности звеньев этой зоны, можно говорить о ее непрерывно-прерывистом характере развития.…”

Section: заключениеunclassified

Khatanga-Lomonosov fault zone: structure, tectonic position and geodynamics

Lobkovsky¹,

Шипилов²,

Skarubo³

2019

AEE

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ФГБУН Полярный геофизический институт Кольского научного центра РАН (Мурманск, Российская Федерация) Л. И. Лобковский ФГБУН Институт океанологии им. П. П. Ширшова РАН (Москва, Российская Федерация) С. И. Шкарубо ООО «Морская арк тическая геологоразведочная экспедиция» (Мурманск, Российская Федерация) Статья поступила в редакцию 12 апреля 2019 г. Впервые по результатам интерпретации новых сейсмических материалов рассмотрены особенности строения Хатангско-Ломоносовской зоны разломов, адаптированной к полосе сочленения Лаптевоморской континентальной окраины со структурами Евразийского спредингового бассейна и хребта Ломоносова. Проиллюстрировано отражение Хатангско-Ломоносовской зоны разломов в аномальных геофизических полях, в волновой сейсмической картине на разрезах и продемонстрирован характер ее кинематических взаимоотношений с разнородными тектоническими элементами. Наиболее заметные горизонтальные движения по этой зоне приходятся на конец мела-первую половину палеогена. Обосновывается тектоническая природа, роль и место этой зоны разломов в геодинамической эволюции региона.

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Geodynamic Activity of Modern Structures and Tectonic Stress Fields in Northeast Asia

Cited by 18 publications

References 38 publications

Warming temperatures are impacting the hydrometeorological regime of Russian rivers in the zone of continuous permafrost

Warming temperatures are impacting the hydrometeorological regime of Russian rivers in the zone of continuous permafrost

Dynamics of the Zones of Strong Earthquake Epicenters in the Arctic–Asian Seismic Belt

Khatanga-Lomonosov fault zone: structure, tectonic position and geodynamics

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