气候变化领域集成服务门户(CCPortal): The Late Quaternary slip-rate of the Kichera Fault (North Baikal Rift) from morphotectonic, paleoseismological and cosmogenic 10Be analyses

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DOI	10.1016/j.tecto.2021.228915
	The Late Quaternary slip-rate of the Kichera Fault (North Baikal Rift) from morphotectonic, paleoseismological and cosmogenic 10Be analyses
	Arzhannikova A.; Braucher R.; Arzhannikov S.; ASTER Team
发表日期	2021
ISSN	00401951
卷号	812
英文摘要	Late Quaternary slip rates characterize the seismic potential of an active fault in terms of estimating the average expected recurrence period for rupturing episodes. Along the Baikal Rift faults the slip rate distributions are poorly understood. This study provides morphotectonic and paleoseismological analyses of the Kichera Fault that stretches within the North Baikal Rift over a length of 100 km. Exposure ages of key displaced terraces of the Neruchanda River from in-situ produced cosmogenic 10Be depth profiles show that the highest terrace T5 is older than 315 ka, intermediate terrace T3 was abandoned 100.0 ± 30 ka ago and the lowest terrace T1 is as old as 48.3 ± 19.9 ka. These exposure ages, coupled with terrace elevation from the actual Neruchanda River bed, allow us to estimate the incision rates for the corresponding time periods which are 0.1 (maximum), 0.16 ± 0.05 and 0.19 ± 0.08 mm yr−1, respectively. Using the cumulated amplitudes of the terrace displacement, we estimate the vertical slip rates along the Kichera Fault are 0.42 ± 0.13 and 0.19 ± 0.08 mm yr−1 over the last ~100 ka and ~48.3 ka, respectively. Paleoseismological studies including morphomertic analyses of the tectonic scarp and trenching across the fault allowed estimating the age (5.4 ka) and minimum magnitude (6.8) of the last Kichera Fault rupture. Using the estimates of short- and long-term slip rates, we propose mean recurrence intervals of 5.3 and 2.4 ka, respectively. The last interval is shorter than the time since the last earthquake, indicating that the future event could be of greater magnitude to maintain the long-term average slip rate. © 2021 Elsevier B.V.
关键词	Baikal rift system cosmogenic 10Be dating Morphotectonics South Siberia terraces formation
英文关键词	Earthquakes; Active fault; Exposure age; Fault ruptures; Incision rates; Late quaternary; Mean recurrence intervals; Rift faults; Time-periods; Fault slips; beryllium isotope; faulting; future prospect; paleoseismicity; rift zone; slip rate; tectonic evolution; tectonic setting; Baikal Rift Zone; Russian Federation
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207939
作者单位	Institute of the Earth's Crust, Russian Academy of Sciences, Siberian Branch, Irkutsk, Russian Federation; CEREGE, CNRS, IRD, INRAE, Aix Marseille Univ., Collège de France, Aix en Provence, France
推荐引用方式 GB/T 7714	Arzhannikova A.,Braucher R.,Arzhannikov S.,et al. The Late Quaternary slip-rate of the Kichera Fault (North Baikal Rift) from morphotectonic, paleoseismological and cosmogenic 10Be analyses[J],2021,812.
APA	Arzhannikova A.,Braucher R.,Arzhannikov S.,&ASTER Team.(2021).The Late Quaternary slip-rate of the Kichera Fault (North Baikal Rift) from morphotectonic, paleoseismological and cosmogenic 10Be analyses.Tectonophysics,812.
MLA	Arzhannikova A.,et al."The Late Quaternary slip-rate of the Kichera Fault (North Baikal Rift) from morphotectonic, paleoseismological and cosmogenic 10Be analyses".Tectonophysics 812(2021).