The formation of Proval Bay as an episode in the development of the Baikal rift basin: A case study

Shchetnikov, Alexander A.; Radziminovich, Ya. B.; Вологина, Е. Г.; Уфимцев, Г. Ф.

doi:10.1016/j.geomorph.2012.07.023

Cited by 16 publications

(23 citation statements)

References 32 publications

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“…In the Baikal basin, tectonically driven earthquakes induce subsidence on the delta topset with a recurrence time of 350-500 yr and with an average of ~3 m of vertical (downward) movement per event (Shchetnikov et al, 2012). This magnitude and frequency produce subsidence rates of 6-8 mm/yr over time scales of centuries to millennia (Vologina et al, 2010), and this is a minimum estimate of subsidence rate because it does not consider sediment compaction.…”

Section: Paradox Of Arrested Gravel Frontmentioning

confidence: 99%

“…It is known that the preservation potential of fluvialdeltaic stratigraphy is closely related to tectonically driven subsidence, and this interplay may be evaluated by the ratio of channel to tectonic time scales (Kim et al, 2010;Straub et al, 2013). In essence, if the tectonically induced subsidence rate is faster than the channel reworking rate on the delta topset, it is possible to imprint a significant fraction of the subaerial deltaic landscape into the subsurface stratigraphy, because tectonic events lower portions of the delta topset below the active reworking depth of the laterally sweeping distributary channels (Kim et al, 2010;Shchetnikov et al, 2012). As a result, in a tectonically dominated system, the morphological processes of the delta topset play a key role in constructing basin stratigraphy.…”

Section: Introductionmentioning

confidence: 99%

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Controls on gravel termination in seven distributary channels of the Selenga River Delta, Baikal Rift basin, Russia

Dong

Nittrouer

Il'icheva

et al. 2016

Geological Society of America Bulletin

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The Selenga River Delta, Lake Baikal, Russia, is ~600 km 2 in size and contains multiple distributary channels that receive varying amounts of water and sediment discharge. The delta is positioned along the deep-water (~1600 m) margin of Lake Baikal, a half-graben-styled rift basin, qualifying it as a modern analogue of a shelf-edge delta system. This study provides a detailed field survey of channel bed sediment composition, channel geometry, and water discharge. The data and analyses presented here indicate that the Selenga Delta ex hibits downstream sediment fining over tens of kilometers, ranging from predominantly gravel (coarse pebble) and sand near its apex to silt and sand at the delta-lake interface. We developed an analytical framework to evaluate the downstream elimination of gravel within the multiple distributary channels. The findings include the following. (1) The Selenga River Delta consists of at least eight orders of distributary channels. (2) With increasing channel order downstream, channel cross-sectional area, width-depth ratio, water discharge, boundary shear stress, and sediment flux systematically decrease. (3) The downstream elimination of gravel in distributary channels is caused by declining boundary shear stress as a result of water discharge partitioning among the bifurcating channels. (4) Over longer time scales, gravel is contained on the delta topset due to frequent and discrete seismic events that produce subsidence and accommodation, so that coarse sediment cannot be transported to the axis of the Baikal Rift basin. The distribution of sediment grain size in deltaic channels, as related to hydrodynamics and sediment transport, plays a critical role in influencing stratigraphy, because the sustained tectonism leads to high preservation potential of the delta topset sedimentary deposits. Therefore, the Selenga River Delta provides an opportunity to explore the interactions between modern deltaic sedimentation processes and tectonics that affect the production of basin stratigraphy.

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Section: Paradox Of Arrested Gravel Frontmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Controls on gravel termination in seven distributary channels of the Selenga River Delta, Baikal Rift basin, Russia

Dong

Nittrouer

Il'icheva

et al. 2016

Geological Society of America Bulletin

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“…The strongest seismic event known in the study area is the January 12, 1862, M 7.5 Tsagan earthquake (Kondorskaya and Shebalin 1982 ; Golenetskii 1996 ). This earthquake was accompanied by seismogenic subsidence of a tectonic block with an area of more than 200 km 2 and the formation of Proval Bay in the northeastern part of the Selenga delta (Golenetskii 1996 ), which, in turn, can be considered as a separate episode in the evolution of the Baikal basin (Shchetnikov et al 2012 ). Macroseismic effects of the Tsagan earthquake were observed over a vast area; the epicentral intensity is IX–X MSK-64 (Golenetskii 1996 ).…”

Section: Tectonic Settings and Seismicity Of Study Areamentioning

confidence: 99%

The December 9, 2020, Mw 5.5 Kudara earthquake (Middle Baikal, Russia): internet questionnaire hard test and macroseismic data analysis

Radziminovich

Гилева

Тубанов

et al. 2022

Bull Earthquake Eng

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The article discusses the macroseismic data on the December 9, 2020, M w 5.5 Kudara earthquake which occurred in the Selenga River delta (Middle Baikal, Eastern Siberia, Russia). This is the strongest seismic event in the study area over a 50-year period. The bulk of macroseismic data was obtained with internet questionnaire posted on the website of the Baikal Branch of the Geophysical Survey of the Russian Academy of Sciences. In total, 1433 responses were received from 120 places (villages, towns and cities) in Eastern Siberia, with most of them was obtained from large cities. In addition, a field survey was carried out in the near-field, which revealed slight non-structural damage to buildings in several settlements. The maximum intensity assessed VI–VII MSK-64 or VI EMS-98 was observed in the Kudara village. Taking into account the macroseismic data obtained, we have prepared a map of intensity data points. The largely observed shakings (intensity IV MSK-64/EMS-98) were noted at epicentral distances of over 500 km; intensity II MSK-64/EMS-98 was noted at a distance of up to 980 km. The Kudara earthquake allowed us to test the internet questionnaire in real conditions of strong seismic impact. The results obtained confirm the rather high efficiency of the internet questionnaire in the conditions of the Baikal region, however, some limitations associated with the responses spatial distribution are exist. A detailed study of the Kudara earthquake allowed us to gain new experience useful for the further development of macroseismology in Eastern Siberia.

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“…In this regard, it is important that the area of the Selenga River delta is considered a center of the formation and development of the Baikal rift zone [Logachev, 2003]. We also note that strong seismic events similar to the Tsagan earthquake (M=7.5) should be considered as separate key episodes of the development of the Baikal basin [Shchetnikov et al, 2012].…”

Section: S E Le N G Amentioning

confidence: 99%

“…Its estimated magnitude M was 7.5, and the shaking intensity at the epi center area reached degree X (MSK-64 scale) [Kondorskaya, Shebalin, 1982;Golenetskii, 1996]. This earthquake caused the subsidence of a tectonic block and the sinking of almost 5 m of a land area of more than 200 km 2 into Lake Baikal [Sgibnev, 1864;Shchetnikov et al, 2012]. Consequently, sedimentation conditions in a significant part of the Selenga delta were drastically changed.…”

Section: Traces Of Historical Earthquakesmentioning

confidence: 99%

Traces of High Seismic Activity in the Uppermost Sediments of Lake Baikal, Siberia

Вологина

Штурм

Радзиминович

2021

Geodin. tektonofiz.

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Sedimentation in Lake Baikal is significantly affected by continuous seismic activity in the Baikal Rift Zone. Our study shows that historical earthquakes, as well as recent seismic events, considerably influenced sedimentation in this deep tectonic basin. Here we present some of the results of extensive international research activities during the period of 1996–2019. To identify traces of seismic events in the uppermost sediments (<1.5 m), short cores were recovered from many coring stations throughout the entire lake. Based on lithological descriptions, measurements of magnetic susceptibility, and concentration of inorganic and organic components, we identified earthquake indicators in the sediment cores. Impacts of historical earthquakes were traced within South Baikal (near the Sharyzhalgai Station and the Station 106-km of the Circum-Baikal railway, hereafter CBR) and Proval Bay (near the Selenga River delta).

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The formation of Proval Bay as an episode in the development of the Baikal rift basin: A case study

Cited by 16 publications

References 32 publications

Controls on gravel termination in seven distributary channels of the Selenga River Delta, Baikal Rift basin, Russia

Controls on gravel termination in seven distributary channels of the Selenga River Delta, Baikal Rift basin, Russia

The December 9, 2020, Mw 5.5 Kudara earthquake (Middle Baikal, Russia): internet questionnaire hard test and macroseismic data analysis

Traces of High Seismic Activity in the Uppermost Sediments of Lake Baikal, Siberia

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