Seismicity of Chukotka, northeastern Russia

Fujita, Kazuya; Mackey, K. G.; McCaleb, Robert C.; Gunbina, L. V.; Kovalev, Valentin N.; Imaev, V. S.; Смирнов, В. Н.

doi:10.1130/0-8137-2360-4.259

Cited by 23 publications

(34 citation statements)

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“…This is in concordance with the minor degree of tectonic activities in and around Lake El'gygytgyn both in the past (Niessen et al, 2007) and in the present (Fujita et al, 2002).…”

Section: Comparison With Other Records From Lake El'gygytgynsupporting

confidence: 66%

Late Quaternary lake-level changes of Lake El'gygytgyn, NE Siberia

et al. 2011

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Lake El'gygytgyn is situated in a 3.6 Ma old impact crater in northeastern Siberia. Presented here is a reconstruction of the Quaternary lake-level history as derived from sediment cores from the southern lake shelf. There, a cliff-like bench 10 m below the modern water level has been investigated. Deep-water sediments on the shelf indicate high lake levels during a warm Mid-Pleistocene period. One period with low lake level prior to Marine Oxygen Isotope Stage (MIS) 3 has been identified, followed by a period of high lake level (10 m above present). In the course of MIS 2 the lake level dropped to − 10 m. At the end of MIS 2 the bench was formed and coarse beach sedimentation occurred. Subsequently, the lake level rose rapidly to the Holocene level. Changes in water level are likely linked to climate variability. During relatively temperate periods the lake becomes free of ice in summer. Strong wave actions transport sediment parallel to the coast and towards the outlet, where the material tends to accumulate, resulting in lake level rise. During cold periods the perennial lake ice cover hampers any wave activity and pebble-transport, keeping the outlet open and causing the lake level to drop.

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“…This is in concordance with the minor degree of tectonic activities in and around Lake El'gygytgyn both in the past (Niessen et al, 2007) and in the present (Fujita et al, 2002).…”

Section: Comparison With Other Records From Lake El'gygytgynsupporting

confidence: 66%

Late Quaternary lake-level changes of Lake El'gygytgyn, NE Siberia

et al. 2011

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“…Although recent seismic activity is reportedly low for the El'gygytgyn region (Fujita et al, 2002), minor faults mapped within the lake sediment stratigraphy during seismic surveys (Niessen et al, 2007) indicate ongoing neotectonic activity. Such fault re-activation explains well the elevated Hg values in the inlet stream sediments.…”

Section: Indicators Of Tectonic Activitymentioning

confidence: 99%

Modern sedimentation patterns in Lake El'gygytgyn, NE Russia, derived from surface sediment and inlet streams samples

et al. 2013

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Abstract. Lake El'gygytgyn/NE Russia holds a continuous 3.58 Ma sediment record, which is regarded as the most longlasting climate archive of the terrestrial Arctic. Based on multi-proxy geochemical, mineralogical, and granulometric analyses of surface sediment, inlet stream and bedrock samples, supplemented by statistical methods, major processes influencing the modern sedimentation in the lake were investigated. Grain-size parameters and chemical elements linked to the input of feldspars from acidic bedrock indicate a windinduced two-cell current system as major driver of sediment transport and accumulation processes in Lake El'gygytgyn. The distribution of mafic rock related elements in the sediment on the lake floor can be traced back to the input of weathering products of basaltic rocks in the catchment. Obvious similarities in the spatial variability of manganese and heavy metals indicate sorption or co-precipitation of these elements with Fe and Mn hydroxides and oxides. But the similar distribution of organic matter and clay contents might also point to a fixation to organic components and clay minerals. An enrichment of mercury in the inlet streams might be indicative of neotectonic activity around the lake. The results of this study add to the fundamental knowledge of the modern lake processes of Lake El'gygytgyn and its lakecatchment interactions, and thus, yield crucial insights for the interpretation of paleo-data from this unique archive.

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“…Определенная закономерность в рас-пределении землетрясений наблюдается в направ-лении от Колючинского залива в Чукотское море, где в 1962, 1971 и 1996 гг. зафиксированы земле-трясения с магнитудой М=5.0-6.0 [Fujita et al, 2002].…”

Section: Fig 6 Seismotectonics Of the Koryak Segment (Modified Afterunclassified

“…Высокая сейсмическая активность этого района и фокальные механизмы сильных землетрясений, указывающие на сбросо-вый характер движения в их очагах (землетрясе-ния 1962, 1971 и 1996 гг. ), свидетельствуют о пре-обладании здесь сейсмического режима, характер-ного для рифтовых зон [Fujita et al, 2002].…”

Section: Fig 6 Seismotectonics Of the Koryak Segment (Modified Afterunclassified

“…По другой нодальной плос-кости, которая почти параллельна береговой ли-нии, определяется режим растяжения. Это совпа-дает с ранее полученными данными, где установ-лено северо-восточное простирание разломов по-добной кинематики, являющихся трансформными между смещенными сегментами рифтов [Fujita et al, 2002;Toro et al, 2003].…”

Section: Fig 6 Seismotectonics Of the Koryak Segment (Modified Afterunclassified

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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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Seismicity of Chukotka, northeastern Russia

Cited by 23 publications

References 0 publications

Late Quaternary lake-level changes of Lake El'gygytgyn, NE Siberia

Late Quaternary lake-level changes of Lake El'gygytgyn, NE Siberia

Modern sedimentation patterns in Lake El'gygytgyn, NE Russia, derived from surface sediment and inlet streams samples

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

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