IEPT RAS

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.

About the article by G. Molchan published in Geophys. J. Int.,239 (2024).

The widely used ETAS seismicity model describes the clustering of seismic events as an epidemic-type process (property A), assuming that the F1 distribution of the number of direct aftershocks is Poisson (property B). The real data favor the geometric distributions F1 (Shebalin et al., 2018). The F2 distribution of the number of all events in a cluster with relative magnitude (relative to the main shock) greater than – Δ is often also associated with geometric type However, the coincidence of distribution types F1 and F2 turns out to be in contradiction with the A-property, and the geometric type F1 is in contradiction with the B-property.

New subglacial BEDMACHINE model shows the presence of a large number of narrow and deep bedrock depressions in various regions of Antarctica with depths up to 3500 m below sea level (Denman Depression).