Seismotectonics of the Chersky Seismic Belt, eastern Sakha Republic (Yakutia) and Magadan District, Russia

Fujita, Kazuya; Козьмин, Б. М.; Mackey, K. G.; Riegel, S. A.; McLean, M. S.; Imaev, V. S.

doi:10.5194/smsps-4-117-2009

Cited by 46 publications

(40 citation statements)

References 62 publications

(150 reference statements)

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“…The lake's shift off-centre towards the east might be another result of this block motion during the local orogenesis. Today's seismicity map indicates that earthquakes with magnitudes up to 4 shake the area (Fujita et al, 2009). .…”

Section: Geographical Setting Of El'gygytgyn Cratermentioning

confidence: 99%

Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive

Schwamborn¹,

Fedorov²,

Ostanin³

et al. 2012

Clim. Past

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Abstract. The combination of permafrost history and dynamics, lake level changes and the tectonical framework is considered to play a crucial role for sediment delivery to El'gygytgyn Crater Lake, NE Russian Arctic. The purpose of this study is to propose a depositional framework based on analyses of the core strata from the lake margin and historical reconstructions from various studies at the site. A sedimentological program has been conducted using frozen core samples from the 141.5 m long El'gygytgyn 5011-3 permafrost well. The drill site is located in sedimentary permafrost west of the lake that partly fills the El'gygytgyn Crater. The total core sequence is interpreted as strata building up a progradational alluvial fan delta. Four macroscopically distinct sedimentary units are identified. Unit 1 (141.5-117.0 m) is comprised of ice-cemented, matrix-supported sandy gravel and intercalated sandy layers. Sandy layers represent sediments which rained out as particles in the deeper part of the water column under highly energetic conditions. Unit 2 (117.0-24.25 m) is dominated by ice-cemented, matrix-supported sandy gravel with individual gravel layers. Most of the Unit 2 diamicton is understood to result from alluvial wash and subsequent gravitational sliding of coarse-grained (sandy gravel) material on the basin slope. Unit 3 (24.25-8.5 m) has icecemented, matrix-supported sandy gravel that is interrupted by sand beds. These sandy beds are associated with flooding events and represent near-shore sandy shoals. Unit 4 (8.5-0.0 m) is ice-cemented, matrix-supported sandy gravel with varying ice content, mostly higher than below. It consists of slope material and creek fill deposits. The uppermost metre is the active layer (i.e. the top layer of soil with seasonal freeze and thaw) into which modern soil organic matter has been incorporated. The nature of the progradational sediment transport taking place from the western and northern crater margins may be related to the complementary occurrence of frequent turbiditic layers in the central lake basin, as is known from the lake sediment record. Slope processes such as gravitational sliding and sheet flooding occur especially during spring melt and promote mass wasting into the basin. Tectonics are inferred to have initiated the fan accumulation in the first place and possibly the off-centre displacement of the crater lake.

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Section: Geographical Setting Of El'gygytgyn Cratermentioning

confidence: 99%

Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive

Schwamborn¹,

Fedorov²,

Ostanin³

et al. 2012

Clim. Past

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“…Prior to the 1950s the network of seismograph stations was poor in northeastern Russia, and hence historical seismic data cover only the last ca. 60 yr (Fujita et al, 2009). Between 1960 and 2010 two earthquakes were recorded at distances to the lake of 99 and 66 km, respectively (International Seismological Centre, 2011).…”

Section: Prerequisite Site Informationmentioning

confidence: 99%

Mass movement deposits in the 3.6 Ma sediment record of Lake El'gygytgyn, Far East Russian Arctic

et al. 2013

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This paper focuses on the characterization and genesis of mass movement deposits (MMDs) in the Quaternary and Pliocene sediments of Lake El'gygytgyn, Far East Russian Arctic. Three partly overlapping holes were drilled into the 320 m long sediment record at International Continental Scientific Drilling Program (ICDP) Site 5011-1 in the lake basin, recovering the Quaternary almost completely, and the Pliocene down to 3.6 Ma with 52% recovery. Mass movement deposits were investigated in all three cores, based on macroscopical core descriptions, radiographic images, high-resolution magnetic susceptibility and gamma-ray density. Five different types of MMDs were identified: turbidites, grain-flow deposits, debrites, slumps and slides. These are formed by transitional mass movement processes, and thus can be co-generic. An initial slope failure is thought to transform into a debris flow that deforms frontal sediments, partly disintegrates and dilutes into a turbidity flow. Turbidites are by far the most frequent MMD type in the lake center. They occur throughout the record in all pelagic sedimentary facies, but they are thinner in facies formed during cold climate conditions. All other MMDs, by contrast, incise exclusively the pelagic facies deposited during warm climates. In the 123 m thick Quaternary composite sediment record 230 mass movement events are identified, comprising 33% of the sediment length. Turbidites contribute 93% of the number of Quaternary MMDs, but only 35% of their thickness. In the Pliocene sediments between 123 and 320 m, 181 additional mass movement deposits are identified, which constitute ~33% of the recovered sediments. The mean recurrence interval for MMDs is 11 and 5 ka in the Quaternary and Pliocene, respectively

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“…Основой для расчета и анализа параметров СТД служили решения механизмов очагов 248 земле-трясений (M≥3.5) за период 1927-2016 гг., заим-ствованные из международных сейсмологических центров [International Seismological Centre, 2017;Department…, 2017;Global Centroid Moment Tensor Project…, 2017;National Earthquake Information Center…, 2017] и литературных источников [Balakina et al, 1972;Fujita et al, 2009]. Большая часть решений была получена путем расчета тензора сейсмиче-ского момента, остальные -по знакам первых вступлений объемных сейсмических волн.…”

Section: методы исследованийunclassified

“…Следует заметить, что система напряже-ний в очаге Булунского землетрясения с М≥7.0 не совпадает с субдолготной и субширотной ориента-цией главных осей деформаций сжатия и растяже-ния (рис. 4), что, возможно, обусловлено невысокой точностью определения фокального механизма данного события [Fujita et al, 2009].…”

Section: рис 4 схема сейсмотектоники хараулахского сегментаunclassified

“…По особенностям пара-генезисов активных структур [Imaev et al, 2000], строению геофизических полей [Suvorov, Kornilova, 1986;Fujita et al, 2009], а также определенной зако-номерности сейсмического режима [Imaev et al, 2000;Imaeva et al, 2009Imaeva et al, , 2011 в сейсмотектониче-ской зоне Черского выделяются Яно-Индигирский и Индигиро-Колымский региональные сегменты (рис. 5).…”

Section: рис 4 схема сейсмотектоники хараулахского сегментаunclassified

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

Имаева¹,

Гусев²,

Imaev³

et al. 2017

Geodin. tektonofiz.

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Abstract:Based on the analysis of changes in the stress-strain state of the crust at the boundary of the Eurasian and North American tectonic plates, we develop a dynamic model of the main seismogenerating structures in Northeast Asia. We have established a regularity in changes of geodynamic regimes within the interplate boundary between the Kolyma-Chukotka crustal plate and the Eurasian, North American and Pacific tectonic plates: spreading in the Gakkel Ridge area; rifting in the Laptev Sea shelf; a mixture of tectonic stress types in the Kharaulakh segment; transpression in the Chersky seismotectonic zone, in the segment from the Komandor to the Aleutian Islands, and in the Koryak segment; and crustal stretching in the Chukotka segment.

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Seismotectonics of the Chersky Seismic Belt, eastern Sakha Republic (Yakutia) and Magadan District, Russia

Cited by 46 publications

References 62 publications

Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive

Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive

Mass movement deposits in the 3.6 Ma sediment record of Lake El'gygytgyn, Far East Russian Arctic

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

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