, who describe various stratigraphic, geomorphic, structural, and chronologic scenarios and their possibilities and limitations for unambiguously determining whether a fault is active. The definition of active fault depends on the regulatory rules of different countries and is considered in detail by Carbonel et al. Their association with an active fault zone could imply the possibility of generating strong linear morphogenic earthquakes. In any propedeutic survey, it is of utmost importance to determine whether certain linear morphological and/or structural features are associated with seismic fault ruptures. Seismic hazards are defined as ‘‘the potential for dangerous, earthquake-related natural phenomena such as ground shaking, fault rupture, or soil liquefaction’’ or ‘‘a property of an earthquake that can cause damage and loss’’. The cost of the object and the possibility of its construction depend on the results of a detailed geological mapping and accurate seismic hazard assessment. The problem of identifying active faults and their displacement parameters in various geological settings is crucial in the design of large engineering infrastructures. The applied analysis methods can be useful for paleoseismology and assessing seismic hazards in similar regions elsewhere.
The approximate intervals in which earthquakes occurred are 12–5 ka and 4–0.3 ka, respectively. 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 Mw of the earlier event was 7.3 (Ms = 7.4) the Mw of the later one was 7.1 (Ms = 7.3). The obtained results show that past landslides and paleoruptures at Cape Rytyi and its surroundings are associated with at least two earthquakes.
Based on unmanned aerial photography, GPR, and structural observations, we mapped and investigated the relation between geomorphological forms and ruptures. The case study was at Cape Rytyi, located in Baikal-Lena Nature Reserve on the northwestern shore of Lake Baikal. 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 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.
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