Neotectonic activity and parameters of seismotectonic deformations of seismic belts in Northeast Asia

Seismotectonics of the northern sector of the Verkhoyansk fold system (north-east of the Russian Arctic)

“…Our seismotectonic studies are based on the concept envisaging the structural and dynamic uniformity of the geophysical medium and specific regulari-ties of seismogeodynamic processes taking place in this medium. The research methodology was developed by the Institute of Physics of the Earth RAS [8,9] and supplemented as described in [7,10,11]. The research algorithm starts with establishing the general trends in the neotectonic development of the study area.…”

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

“…Seismotectonic studies are based on the concept of the structural and dynamic uniformity of the geophysical medium and regularities in the development of seismogeodynamic processes, which is elaborated by the Institute of Physics of the Earth of the Russian Academy of Sciences (IPE RAS) [4,5] and developed in [1][2][3]6,7]. The research method used in our studies of the Russian Arctic includes several stages.…”

“…The western portion is traced from the Tajmyr fold system along and towards the abyssal basin. In plan, these seismogenerating structures contour the margins of the Laptev Sea Microplate [1,3,7]. According to the seismological data, the western and eastern boundaries of the Laptev Sea Microplate are subjected to compression (Figures 1 and 2).…”

“…The principal stress axes are directed across the strike of the main tectonic elements; those with low dip angles are NW-SW-trending (Figures 1 and 3). Most focal mechanisms of the local earthquakes show normal faulting, with the exception of the 1990 Мs 4.9 Taimyr earthquake in the western margin of the Laptev Sea shelf and the 2015 Мs 4.3 earthquake in the NW part of the Taimyr Peninsula ( Figure 2) [3,7]. Their focal mechanism solutions significantly differ In the zone of the Lena-Anabar regional suture, the seismic process develops in conditions of both extension (Lena River delta, shores of Olenek, and Anabars bays) and compression (Taimyr Peninsula).…”

“…The geodynamic processes in this belt are studied as indicators of types of seismotectonic deformations of the crust in the contact zone where the Eurasian, North American, and Okhotsk Sea lithospheric plates interact and move relative to each other ( Figure 1). This paper reviews published results regarding the Laptev Sea Segment, Kharaulakh Segment, and the Chersky Seismotectonic Zone [2,3], and presents new research results. It discusses the dynamics of the formation of neotectonic structures and the types of the crustal stress-strain state in the zones of strong earthquake epicenters in the Arctic-Asian seismic belt.…”