Change of seismic hazard levels in complete 12-year seismogeodynamic cycle of the South Baikal Basin: results of hydroisotopic (234U/238U) monitoring

IF 0.8 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Italian Journal of Engineering Geology and Environment Pub Date : 2022-01-01 DOI:10.26516/2541-9641.2022.2.7

S. Rasskazov, E. Chebykin, A. Ilyasova, S. V. Snopkov, S. Bornyakov, I. Chuvashova

引用次数: 0

Abstract

In the western part of the South Baikal Basin, spatial-temporal distribution of earthquake epicenters is characterized by quasi-periodic seismic reactivations. The strongest earthquakes occurred in 1999 (South Baikal, Мw = 6.0), 2008 (Kultuk, Мw = 6.3) and 2020 (Kudara, Мw = 5.4). Since 2013, we have been monitoring the 234U/238U activity ratio (AR4/8) in groundwater as an indicator of crack open/closing that promotes/prevents water circulation in active faults of the basin. From monitoring results, we define the concept of a complete seismogeodynamic cycle as a change from crustal compression to extension occurred during 12 years with a successive increase in seismic hazard levels.

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南贝加尔湖盆地完整12年地震地球动力学周期中地震危险度的变化:水同位素(234U/238U)监测结果

在南贝加尔湖盆地西部，地震震中的时空分布具有准周期性地震再激活的特征。最强地震发生在1999年(南贝加尔湖，Мw = 6.0)， 2008年(Kultuk， Мw = 6.3)和2020年(Kudara， Мw = 5.4)。自2013年以来，我们一直在监测地下水中234U/238U活度比(AR4/8)，作为促进/阻止盆地活动断层水循环的裂缝张开/闭合的指标。根据监测结果，我们将一个完整的地震地球动力学周期定义为在12年内发生的从地壳压缩到伸展的变化，并且地震危险等级连续增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Italian Journal of Engineering Geology and Environment GEOSCIENCES, MULTIDISCIPLINARY-

CiteScore

1.30

自引率

8.30%

发文量

期刊介绍： Italian Journal of Engineering Geology and Environment (IJEGE), published by Sapienza Università Editrice university press, is the open access Journal of the Research Center CERI on "Prediction, Prevention ad Control of Geological Risks" of Sapienza University of Rome. The Journal publishes original papers concerning the numerous topics of environmental risks such as seismic risk, landslide risk, hydraulic and flood risk, groundwater resource management, soil and groundwater contamination, reclamation of contaminated land, applied geophysics, economic geology, land use, soil and rock characterization. IJEGE is the Journal of the Italian Association of Engineering Geology and Environment (AIGA). The Journal is published under the auspices of the International Association for Engineering Geology and the Environment (IAEG) - Italian Group.