Responses of a 234U/238U activity ratio in groundwater to earthquakes in the South Baikal Basin, Siberia

Рассказов, С. В.; Ilyasova, A. M.; Bornyakov, S. A.; Chuvashova, Irina; Чебыкин, Е. П.

doi:10.1007/s11707-020-0821-5

Cited by 7 publications

(3 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Preparation of strong earthquakes was traced through variations of AR4/8 and A4. Both parameters increased when active faults were affected by extension and decreased when those experienced compression (Rasskazov et al, 2020). In addition to uranium isotopes, mercury showed variations that can be used for the prediction of strong earthquakes (Chebykin et al, 2022) (Fig.).…”

Section: Resultsmentioning

confidence: 99%

Mercury hazard of earthquakes in the Baikal seismic zone

Рассказов

Ilyasova²,

Snopkov³

et al. 2022

LFWB

View full text Add to dashboard Cite

Abstract. On the west coast of Lake Baikal, we defined long-term and short-term variations in Hg concentrations of groundwater in 2017 to 2019 and from 2019 to the present, respectively; the latter variations were associated with the 2020 2021 Baikal-Khubsugul seismic reactivation of active faults. We inferred that increasing Hg concentration in groundwater was due to crustal extension with the highest Hg enrichment related to aftershocks. We argue that a Hg flux depends on the nature of fault activities and elevated Hg concentrations in sedimentary layers may designate the release of Hggas and Hggw from seismically active faults in the past 14.4 Ka.

show abstract

Section: Resultsmentioning

confidence: 99%

Mercury hazard of earthquakes in the Baikal seismic zone

Рассказов

Ilyasova²,

Snopkov³

et al. 2022

LFWB

View full text Add to dashboard Cite

show abstract

“…[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]. Зактуйской аномалии ОА4/8 пространственно соответствует эпицентр землетрясения 29.06.1995 (Mw=5.7; К=14), для которого был определен механизм сбросо-сдвигового типа [The Global Centroid-Moment-Tensor…, 2018].…”

Section: аномалии оа4/8unclassified

“…Гидроизотопный мониторинг на разных станциях Култукского полигона показал, что при подготовке Голоустенского землетрясения 2015 г. (К=12.4), эпицентр которого находился в акватории Южного Байкала, в 140 км от Култукского полигона, и небольших землетрясений непосредственно на Култукском полигоне сначала наблюдалось закрытие трещин, а затем их открытие с наполнением водой, сопровождавшееся переходом от крупноамплитудных вариаций ОА4/8 к малоамплитудным, обозначавшим сейсмоопасное состояние разлома [Rasskazov et al, 2018]…”

Section: перестройка сейсмогенерирующей структурыunclassified

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.

View full text Add to dashboard Cite

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.

show abstract