Hydrogeochemical earthquake precursor in the southern Baikal region

Semenov, R. M.; Kashkovskii, V.V.; Lopatin, M. N.

doi:10.1016/j.rgg.2017.11.015

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Однозначным является лишь последний (позднеорогенный) этап растяжения с СЗ-ЮВ простиранием главной оси, который маркируется существенным увеличением скорости накопления и резким изменением состава озерных осадков в плиоцен-четвертичное время, что связывают с активизацией рифтогенеза [Logachev, 2003;и др.]. Процесс рифтообразования продолжается на современном этапе развития БРС, что отражается в механизмах очагов землетрясений [Melnikova, Radziminovich, 1998, 2007. Неоднозначность типов тектонических напряжений более ранних этапов развития региона, по мнению авторов, связана с трудностями, охарактеризованными в предыдущем разделе.…”

Section: изменение тектонических напряженийunclassified

Tectonic Stresses in the Chersky Fault Zone (Baikal Rift System

Cheremnykh,

Dekabryov

2023

Geodin. tektonofiz.

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Based on the kinematic and structural-paragenetic approaches, there were performed the reconstructions of tectonic stresses in the Chersky fault zone. Rank analysis as applied to specialized mapping of fault zones was made for heterochronous rock complexes: Paleozoic, Upper Oligocene – Lower Pliocene and Upper Pliocene – Quaternary. There are distinguished three regional stress fields: Pre-Cenozoic compressive stress field with the NW-SE striking principal axis and two Cenozoic tensile stress fields with different axial orientations. The Cenozoic tensile stress field with a sub-meridionally striking minimum compression axis may be an earlier occurrence because it was found to exist in the Paleozoic and Oligocene – Early Pliocene rocks, and the tensile stress field, with the NW-SE axial orientation, may be later occurrence as reconstructed for all rock complexes including Quaternary pebbles. No evidence was found of tectonic shear stresses within the studied segment of the Chersky fault zone. Consideration is being given to probable reasons for the absence of residual shear deformations in the region and to the problems in the study of hierarchy of the upper crustal tectonic stresses.

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Section: изменение тектонических напряженийunclassified

Tectonic Stresses in the Chersky Fault Zone (Baikal Rift System

Cheremnykh,

Dekabryov

2023

Geodin. tektonofiz.

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“…Observational wells networks (0.2-2.9 km depth range) or thermal springs created by approximately 600 sampling points (1 sampling site per 10,000 km 2 and higher density in test site areas: The so-called "polygons") were used in Tajikistan, Uzbekistan, Kazakhstan, the Caucasus, and Kamchatka between 1970 and 1990. Various scholars, such as [54,[63][64][65], have stated that some local severe seismic events were preceded, some hours or days before, by precursor changes in the water level and by changes in geochemical parameters, such as helium. The authors of [66] reported on a significant number of seismic events in Kamchatka preceded by variations in the physical and chemical parameters of groundwaters monitored in spring sources and in wells.…”

Section: The Former Soviet Union and The Russian Federationmentioning

confidence: 99%

Previous, Current, and Future Trends in Research into Earthquake Precursors in Geofluids

Martinelli

2020

Geosciences

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Hazard reduction policies include seismic hazard maps based on probabilistic evaluations and the evaluation of geophysical parameters continuously recorded by instrumental networks. Over the past 25 centuries, a large amount of information about earthquake precursory phenomena has been recorded by scholars, scientific institutions, and civil defense agencies. In particular, hydrogeologic measurements and geochemical analyses have been performed in geofluids in search of possible and reliable earthquake precursors. Controlled experimental areas have been set up to investigate physical and chemical mechanisms originating possible preseismic precursory signals. The main test sites for such research are located in China, Iceland, Japan, the Russian Federation, Taiwan, and the USA. The present state of the art about the most relevant scientific achievements has been described. Future research trends and possible development paths have been identified and allow for possible improvements in policies oriented to seismic hazard reduction by geofluid monitoring.

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