西伯利亚贝加尔湖裂谷Rytyi角及其周围地区神秘的地表破裂:地震危险暗示

IF 2.3 Q2 GEOSCIENCES, MULTIDISCIPLINARY Quaternary Pub Date : 2023-03-16 DOI:10.3390/quat6010022
Oksana V. Lunina, I. Denisenko, A. Gladkov, Carlos Braga
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引用次数: 1

摘要

在被侵蚀/沉积迅速掩盖的地区,活动断层的地貌表现和古地震事件的区别仍然是一个相当大的科学问题。本文讨论了地表断裂破裂的揭示及其参数,以在不挖沟的情况下识别有能力的断层并估计地震震级。案例研究发生在贝加尔湖西北海岸贝加尔勒纳自然保护区的雷蒂角。基于无人航空摄影、地质雷达和结构观测,我们绘制并研究了地貌形式与断裂之间的关系。研究结果表明,雷蒂角及其周围地区过去的山体滑坡和古断裂至少与两次地震有关。早期事件的Mw为7.3(Ms=7.4);后一次的Mw为7.1(Ms=7.3)。丽塔河三角洲远端和贝加尔岭东南坡的古断裂被包括在发震断裂带中,该断裂带沿Kocherikovsky断层延伸约37km。地震发生的大致间隔分别为12–5 ka和4–0.3 ka。所应用的分析方法可用于古地震学和评估其他类似地区的地震灾害。
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Enigmatic Surface Ruptures at Cape Rytyi and Surroundings, Baikal Rift, Siberia: Seismic Hazard Implication
The geomorphic expression of active faulting and distinction of paleoseismic events in areas that are rapidly obscured by erosion/sedimentation still remains a considerable scientific problem. The present article discusses the revealing of surface faulting ruptures and their parameters to identify capable faults without trenching and to estimate the magnitude of earthquakes. The case study was at Cape Rytyi, located in Baikal-Lena Nature Reserve on the northwestern shore of Lake Baikal. Based on unmanned aerial photography, GPR, and structural observations, we mapped and investigated the relation between geomorphological forms and ruptures. The obtained results show that past landslides and paleoruptures at Cape Rytyi and its surroundings are associated with at least two earthquakes. The Mw of the earlier event was 7.3 (Ms = 7.4); the Mw of the later one was 7.1 (Ms = 7.3). The paleoruptures in the distal part of the delta of the Rita River and on the southeastern slope of the Baikal Ridge were included in the seismogenic rupture zone, which traces some 37 km along the Kocherikovsky fault. The approximate intervals in which earthquakes occurred are 12–5 ka and 4–0.3 ka, respectively. The applied analysis methods can be useful for paleoseismology and assessing seismic hazards in similar regions elsewhere.
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来源期刊
Quaternary
Quaternary GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.30
自引率
4.30%
发文量
44
审稿时长
11 weeks
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