IEPT RAS

The plenary report by RAS Academician Leopold Isaevich Lobkovsky, “Generalization of Plate Tectonics Theory for the Current Stage of Earth’s Development Based on a 3D Model of Mantle Convection,” and the plenary report by IEPT RAS Senior Researcher A. A. Baranov, “A Three-Dimensional Convective Model of Mantle Flows Under the Oceans,” examines the problem of choosing a path for global geodynamics in the first half of the 21st century, based on a critical analysis of some of the initial assumptions of plate tectonics theory and the justification for its significant modification and generalization. As a general theoretical platform for the development of modern global geodynamics, incorporating the fundamental principles of plate tectonics, a 3D model of mantle convection for the modern Earth, developed by the scientific group of Academician L. I. Lobkovsky, is proposed. This model is based on seismic tomography data determining its internal structure.

More“On the presentation by IEPT RAS scientists at the 52nd Tectonics Meeting “Tectonics and Geodynamics of the Earth’s Crust and Mantle: Fundamental Problems-2026”.”

This rupture model was derived using horizontal and vertical displacement data from ten GNSS stations, averaged over the first two days following the earthquake. The model comprises a set of arbitrarily shaped polygons lying in a single fault plane (strike = 220°, dip = 28°), within which slip is assumed to be spatially uniform. Each polygon is defined as an assemblage of point sources. Slip amplitudes within the source are shown in Figures a and b in black font. The initial geometry of the polygons was constrained by the spatial distribution of aftershocks during the first week after the mainshock. Initial slip estimates were obtained from empirical scaling relationships between slip and magnitude. Subsequent adjustments to both geometry and slip distribution were made to achieve the best fit to the GNSS observations.

Previously, in a series of the author’s works on the construction and analysis of the generalized vicinity of a large earthquake (GVLE), a set of average predictive anomalies was described in details. It was shown that the physical mechanism of earthquakes of different depths is different, and, accordingly, their precursors are different also

The paper «An efficient Galerkin method for problems with physically realistic boundary» conditions was published in the journal «Computer Physics Communications». The author of the article is doctor of physical and mathematical sciences O.M.Podvigina.

A geodynamic model of the modern Earth is constructed based on the SMEAN 2 global seismic tomography model with an emphasis on the Arctic region. For a spherical Earth model, a solution of the Stokes equation for a viscous fluid was obtained based on seismic tomography data using the CitcomS code. The resulting distributions of temperature anomalies and velocity fields of mantle flows explain the main features of the modern geodynamics of the Arctic region.