КАРТА СЕЙСМОТЕКТОНИКИ ВОСТОЧНОЙ СИБИРИ

The paper reviews goals and objectives, stages and the content of seismotectonic studies conducted in Eastern Siberia. Such studies are based on a comprehensive analysis of geological and geophysical data and provide for establishing whether the local earthquakes are of tectonic origin and revealing their relationships with recent geodynamic processes in the area under study. Seismic hazard assessment and evaluation of tectonic processes are the two major, closely interrelated aspects of seismotectonic studies. The latter are generally conducted in combination with seismic studies prior to the stage of detailed seismic zonation (DSZ) which is followed by seismic micro-zonation (SMZ). In three stages of seismotectonic studies, we analyse specific geological structures, reveal the regional dynamics of seismotectonic processes, clarify details of potential seismic hazard locations and identify sites of the potential instantaneous deformation of the crust which may take place due to active faulting. Based on results of the long-term studies conducted by the authors, a seismotectonic map of Eastern Siberia is compiled. The paper briefly reviews the methods of mapping and refers to data on active faults and neotectonic structures revealed in the area under study, which are closely related to regional earthquake sources.В статье рассматриваются задачи, стадийность проведения и содержание сейсмотектонических исследований как отдельного вида анализа комплексных геолого-геофизических материалов, используемых для установления тектонической природы проявлений местных землетрясений и их связи с современными геодинамическими процессами, протекающими на исследуемой территории. В задачи сейсмотектонических исследований входят два тесно взаимосвязанных направления: оценка опасности сейсмических явлений и оценка тектонических процессов. Сейсмотектонические исследования, совместно с сейсмологическими, всегда предваряют стадию детального сейсмического районирования (ДСР) и в последующем – сейсмического микрорайонирования (СМР). Сами сейсмотектонические исследования проводятся в три этапа и позволяют на региональном уровне изучения конкретных геологических структур определить геодинамику сейсмотектонических процессов, провести детальную локализацию сейсмической опасности и выявить места возможного проявления мгновенных деформаций земной поверхности, связанных с активными разломами. Результаты многолетних авторских исследований обобщены в карте сейсмотектоники Восточной Сибири, для которой дается краткое описание принципов и методов ее построения, приводятся наглядные примеры выделенных активных разломов и неотектонических структур, тесно связанных с региональными эпицентрами землетрясений

Dynamics of the Zones of Strong Earthquake Epicenters in the Arctic–Asian Seismic Belt

Our comprehensive study of the Russian Arctic region aims to clarify the features and types of seismotectonic deformation of the crust in the Arctic–Asian Seismic Belt, specifically in the zones of strong earthquakes in the Laptev Sea Segment, the Kharaulakh Segment, and the Chersky Seismotectonic Zone. We have analyzed modern tectonic structures and active fault systems, as well as tectonic stress fields reconstructed by tectonophysical analysis of the Late Cenozoic faults and folds. The investigated neotectonic structures are ranked with respect to the regional classification principles. Changes in the crustal stress–strain state in the lithospheric plate boundaries between the Eurasian, North American, and Okhotsk Sea Plates are analyzed, and regularities of such changes are discovered. A set of models has been constructed for the studied segments of plate boundaries with account of the dynamics of the regional geological structures. The models can give a framework for the assessment of potential seismic risks of seismogenerating structures in the Russian Arctic region

A SEISMOTECTONIC MAP OF EASTERN SIBERIA

The paper reviews goals and objectives, stages and the content of seismotectonic studies conducted in Eastern Siberia. Such studies are based on a comprehensive analysis of geological and geophysical data and provide for establishing whether the local earthquakes are of tectonic origin and revealing their relationships with recent geodynamic processes in the area under study. Seismic hazard assessment and evaluation of tectonic processes are the two major, closely interrelated aspects of seismotectonic studies. The latter are generally conducted in combination with seismic studies prior to the stage of detailed seismic zonation (DSZ) which is followed by seismic micro-zonation (SMZ). In three stages of seismotectonic studies, we analyse specific geological structures, reveal the regional dynamics of seismotectonic processes, clarify details of potential seismic hazard locations and identify sites of the potential instantaneous deformation of the crust which may take place due to active faulting. Based on results of the long-term studies conducted by the authors, a seismotectonic map of Eastern Siberia is compiled. The paper briefly reviews the methods of mapping and refers to data on active faults and neotectonic structures revealed in the area under study, which are closely related to regional earthquake sources