The 2008 Kultuk earthquake with M w = 6.3 in the south of Baikal: Spatial-temporal analysis of seismic activation

Мельникова, В. И.; Гилева, Н. А.; Aref’ev, S. S.; Быкова, В. В.; Masal’skii, O. K.

doi:10.1134/s1069351312060031

Cited by 16 publications

(8 citation statements)

References 10 publications

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“…The key assumption on significant Late Cenozoic lateral displacements along the Main Sayan fault (Lamakin, 1978), taken for later palinspastic reconstruction of the Baikal opening, was not confirmed geologically, however (Rasskazov et al, 2013). Although the structural continuation of the Main Sayan fault under the lake is reflected in seismicity (Melnikova et al, 2012); it is obvious that the Late Cenozoic rapid subsidence of the South Baikal Basin, uncompensated by sediments, was in contrast with the uplift of the adjacent Tunka Rift Valley (Rasskazov et al, 2020). New data obtained on sediments of the southern and northern coasts of the Baikal provide a benchmark for assessing the time and nature of the initiation of tectonic motions that led to the basin formation for the deep Baikal.…”

Section: Discussionmentioning

confidence: 99%

The main structural reorganization of the South Baikal Basin: Early Pliocene initiation of strong tectonic deformations and the Lena runoff from Lake Baikal

Рассказов

Hamud

Kononov

et al. 2020

LFWB

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On the southern coast of Lake Baikal, we have recorded conformed relations between stratons from the Eocene to the Early Pliocene and overturned ones of this deformed sedimentary stratum. On the opposite coast of the lake, on the Angara-Lena watershed, we have identified the Lower Pliocene sediments in the Pra-Manzurka paleovalley. We suggest that the simultaneous initiation of strong tectonic deformations of sediments on the southern shore of the lake and the Lena runoff on its opposite shore designate the main Early Pliocene structural reorganization that led to the formation of the modern deep Baikal.

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Section: Discussionmentioning

confidence: 99%

The main structural reorganization of the South Baikal Basin: Early Pliocene initiation of strong tectonic deformations and the Lena runoff from Lake Baikal

Рассказов

Hamud

Kononov

et al. 2020

LFWB

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“…The mechanisms of strong earthquakes after [Delouis et al, 2002;The Global Centroid-Moment-Tensor…, 2018;Seredkina, Melnikova, 2014]. [Mel'nikova et al, 2012;Map…, 2017]. Сейсмические события акватории Южного Байкала находят отклики в вариациях ОА4/8 подземных вод Култукского полигона [Rasskazov et al, 2018].…”

Section: аномалии оа4/8unclassified

The 234U/238U variations in groundwater from the Mondy area in response to earthquakes at the termination of the Tunka Valley in the Baikal Rift System

Рассказов

Ильясова

Chuvashova

et al. 2018

Geodin. tektonofiz.

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High 234U/238U activity ratio (AR4/8), identified in groundwater from the Elovka-Kultuk and Nilovka-Mondy inversion sections of the Tunka Valley, coincide with areas of earthquake concentrations. In order to substantiate an approach to earthquake prediction, spatial variations of this parameter were determined in natural water at the western termination of the valley and its temporal variations were monitored in water from the Mon-D well in the Mondy basin in 2013–2017. A recorded gradual decrease of AR4/8 values in water of this well, coeval with preparation and implementation of an earthquake with the energy class K=13.9 in the north of lake Khövsgöl, reflected crack closure that prevented deep water penetration in the Tumelik-Mondy aseismic zone. At the eastern termination of the valley, near the Kultuk village, decreasing AR4/8 values in groundwater were followed with their sharp increasing and transition to low-amplitude variations. Accordingly, crack closing was followed with their opening that facilitated the circulation of deep water and provided seismic events. Leveling of the Mondy anomaly in the Tumelik-Mondy aseismic zone, accompanied by a continuous activity of the Turan and Nilovka anomalies within the Nilovka-Mondy section, emphasized a specific role of the latter as an intermediate chain between the Khövsgöl segment of radial rifts, originated in front of the Hangay orogen, and the largest central basin of the Tunka Valley. The Kultuk, Zaktuy, and North-Tory AR4/8 and earthquake anomalies denoted boundaries of the Elovka-Kultuk section in the Khamardaban lithospheric block flattened at the edge of the Siberian platform basement.

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“…Вполне возможно, что истинно «одиночных» сильных и уме ренной силы коровых землетрясений не бывает вооб ще. При благоприятных условиях регистрации, как в случае с Култукским землетрясением, удалось снизить представительный класс до К≥4, и в общей сложности было записано 1790 афтершоков [Melnikova et al, 2012]. Однако в данной работе мы вынуждены опери ровать событиями, как уже упоминалось, с К≥6.6, т.е.…”

Section: результатыunclassified

Identification of earthquake aftershock and swarm sequences in the Baikal rift zone

Радзиминович¹,

Очковская²

2013

Geodyn. Tectonophys.

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The catalog of earthquakes (К R ≥6.6) which occurred in the Baikal rift zone (BRZ) was declastered, and the results are presented in the article. Aftershocks of seismic events (К R ≥12.5) were determined by the software developed by V.B. Smirnov (Lomonosov Moscow State University) with application of the algorithm coauthored by G.M. Molchan and O.E. Dmitrieva. To ensure proper control of the software application, aftershocks were also selected manually. The results of declustering show that aftershocks of the earthquakes (К R ≥12.5) account for about 25 per cent of all seismic events in the regional catalog. Aftershocks accompanied 90 per cent of all the earthquakes considered as main shocks. Besides, earthquake swarms, including events with К R ≥11, were identified. The results of this study show that, in the BRZ, the swarms and strong events with aftershocks are not spatially separated, and this conclusion differs from the views of the previous studies that reviewed data from a shorter observation period. Moreover, it is noted that the swarms may consist of several main shocks accompanied by aftershocks. The data accumulated over the last fifty years of instrumental observations support the conclu sion made earlier that the swarms in BRZ occur mainly in the northeastward direction from Lake Baikal and also confirm the trend of a small number of aftershocks accompanying earthquakes in the southwestern part of the Baikal rift zone.

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The 2008 Kultuk earthquake with M w = 6.3 in the south of Baikal: Spatial-temporal analysis of seismic activation

Cited by 16 publications

References 10 publications

The main structural reorganization of the South Baikal Basin: Early Pliocene initiation of strong tectonic deformations and the Lena runoff from Lake Baikal

The main structural reorganization of the South Baikal Basin: Early Pliocene initiation of strong tectonic deformations and the Lena runoff from Lake Baikal

The 234U/238U variations in groundwater from the Mondy area in response to earthquakes at the termination of the Tunka Valley in the Baikal Rift System

Identification of earthquake aftershock and swarm sequences in the Baikal rift zone

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