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
https://doi.org/10.5800/GT-2018-9-4-0392
Abstract
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.
About the Authors
S. V. Рассказов
Institute of the Earth's Crust, Siberian Branch of RAS; Irkutsk State University
Russian Federation
Russian Federation
Sergei V. Rasskazov - Doctor of Geology and Mineralogy, Professor, Head of Laboratory.
128 Lermontov street, Irkutsk 664033; 3 Lenin street, Irkutsk 664003
A. M. Ilyasova
Institute of the Earth's Crust, Siberian Branch of RAS
Russian Federation
Russian Federation
Aigul M. Ilyasova - Candidate of Geology and Mineralogy.
128 Lermontovstreet, Irkutsk 664033
I. S. Chuvashova
Institute of the Earth's Crust, Siberian Branch of RAS; Irkutsk State University
Russian Federation
Russian Federation
Irina S. Chuvashova - Candidate of Geology and Mineralogy, Senior Researcher.
128 Lermontov street, Irkutsk 664033; 3 Lenin street, Irkutsk 664003
E. P. Chebykin
Institute of the Earth's Crust, Siberian Branch of RAS; Limnological Institute, Siberian Branch of RAS
Russian Federation
Russian Federation
Eugene P. Chebykin - Candidate of Chemistry, Senior Researcher.
128 Lermontov street, Irkutsk 664033; 3 Ulan-Batorskaya street, Irkutsk 664033
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For citations:
Рассказов S.V., Ilyasova A.M., Chuvashova I.S., Chebykin E.P. 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. Geodynamics & Tectonophysics. 2018;9(4):1217-1234. (In Russ.) https://doi.org/10.5800/GT-2018-9-4-0392
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