The paper addresses the problems associated with the maximum earthquakes in a seismically active region. Pisarenko and Rodkin (2009; 2010; 2015) proposed an alternative to the ambiguously determined parameter of the maximum regional magnitude Mmax in the form of a clearly defined and statistically substantiated parameter of the maximum possible magnitude of an earthquake in a given region on a given future time interval T.
More“Maximum earthquakesin future time intervals”Correlations of the trace element composition of oils and other caustobiolites
Use of mathematical methods, sometimes even quite elementary, in other areas of knowledge often proves to be very efficient. As an example of such use, and, at the same time, an example of cooperation between IEPT RAS and OGRI RAS (Oil and Gas Research Institute RAS), we can point out the results of correlation analysis of the content of trace elements (TE) in oils, coals, black and oil shales, as well as in oil degradation products with the average chemical composition of the upper, middle and lower continental crust and biota.
More“Correlations of the trace element composition of oils and other caustobiolites”Recognition of earthquake-prone areas in the Altai-Sayan-Baikal region
The goal of the study is to identify the possible locations of strong M6+ earthquakes in the Altai-Sayan-Baikal region.
More“Recognition of earthquake-prone areas in the Altai-Sayan-Baikal region”Unified Scaling Law for Earthquakes: Eastern Alps
New publication titled “Unified Scaling Law for Earthquakes: Space-Time Dependent Assessment in Friuli-Venezia Giulia Region” by Anastasia Nekrasova (IEPT RAS) and Antonella Peresan (National Institute of Oceanography and Experimental Geophysics (OGS), Italy) in “Frontiers in Earth Science” (JRL Q2).
More“Unified Scaling Law for Earthquakes: Eastern Alps”Tectonic stresses in the Vrancea seismic zone
The scientists from the Netherlands, Russia, and Romania estimate earthquake source parameters in Vrancea seismic zone and surrounding regions between 2014 and 2020, and determine the stress field via focal mechanism inversion and unsupervised machine learning. The work was published in Tectonophysics (Q1, JIF=3.048).
More“Tectonic stresses in the Vrancea seismic zone”Characterizing the foreshock, main shock, and aftershock sequences of the recent major earthquakes in Alaska
Major earthquakes of M ≥7 are complex. Seismic energy accumulation, release, and redistribution in the lithosphere are not yet well studied. The geometry, timing, and slip distribution of the complex nonlinear system of the lithospheric blocks-and-faults involved is usually not well resolved.
More“Characterizing the foreshock, main shock, and aftershock sequences of the recent major earthquakes in Alaska”Aftershock Rate Changes at Different Ocean Tide Heights
During last decades, the question of the effect of ocean tides on seismicity has been widely investigated. The issue of whether tidal forces really affect seismicity has been raised many times in the literature.
In the present study the differential probability gain approach (Shebalin et al., 2012; Shebalin et al., 2014) is used to estimate quantitatively the change in aftershock rate at various levels of ocean tides, relative to an average Omori-Utsu model that supposes no dependence on tides. The differential probability gain function is a numeric factor indicating how much the rate of aftershocks is increased or decreased on average at specific values of the tide heights.
More“Aftershock Rate Changes at Different Ocean Tide Heights”