Published in Izvestiya, Physics of the Solid Earth
Abstract—Deep earthquakes occur in subduction zones—they play a key role in the global tectonic model. There are only a few places on the Earth where deep-focus seismicity is observed on the continents in small localized areas at a considerable distance from the present-day subduction zones, in particular in the Vrancea region of the Carpathians. T...
Published in Izvestiya, Physics of the Solid Earth
Abstract—Analysis of P- and S-receiver functions for 19 seismic stations on the Balkan Peninsula has been performed. Half of the stations are in Bulgaria. The crustal thickness varies from 28–30 to 50 km. The ratio of longitudinal and shear wave velocities in the upper crust reaches 2.0 in some places. In the southwest of the study area, the 410-km...
Published in Izvestiya, Physics of the Solid Earth
Abstract—In response to the kind invitation of the Editorial Board of the journal “Izvestiya, Physics of the Solid Earth” to take part in the discussion concerning the methodology of statistical study of correlations between geophysical processes, we have done a small research and written this paper. Being predominantly geomagnetologists, we focuse...
Published in Izvestiya, Physics of the Solid Earth
Abstract—Deviations of the vertical crustal velocities measured by a broadband seismic station from the Earth’s tidal velocities predicted by theory are calculated. The deviations are compared with weather data at station site. It is shown that during the intervals of simultaneous occurrences of low atmospheric pressure and rainfalls, strain anomal...
Published in Izvestiya, Physics of the Solid Earth
Abstract—The spectrum of fractoluminescence (FL) upon fracture of the surface of oligoclase is obtained. The analysis of the spectrum has shown that fracture of crystals leads to the formation of electronically excited free radicals ≡Si−O• and Fe3• ions as well as electron traps. FL consisted of a set of the signals with the intensities varying by ...
Published in Izvestiya, Physics of the Solid Earth
Abstract—The seismic migration patterns can be associated with the existing geophysical setting, the tectonic movements and the geographical distribution of seismicity. The right identification of these patterns would lead to the better hazard analysis, forecasts and precise predictions. So, in an attempt to develop a method for the identification ...
Published in Izvestiya, Physics of the Solid Earth
Abstract—Variations of the geomagnetic field and F2-layer critical frequency in the range of periods of planetary waves in winter season are analyzed. The measurements were conducted by a magnetometer and a vertical radio sounding ionosonde at the nearby Belsk and Warsaw stations and provided the records of the ionospheric current variations in the...
Published in Izvestiya, Physics of the Solid Earth
AbstractThe information and seismic parameters gained from pre-instrumental earthquakes are essential to improve the seismic catalogs and hazard studies. The earthquake damage (ED) that affected architectonic elements during earthquakes (e.g. fallen walls, conjugated fractures in walls, dropped keystones in arches), and when this earthquake damage ...
Published in Izvestiya, Physics of the Solid Earth
Abstract—The leading role in geotectonics is currently played by the neomobilistic plate tectonic concept which is based on the division of the the Earth’s crust/lithosphere into plates, blocks, and massifs of different sizes. These crustal units move laterally, driven by the forces that are external to them. For example, it is assumed that under t...
Published in Izvestiya, Physics of the Solid Earth
Abstract—The last activation of the Koryakskii volcano in 2008–2009 was accompanied by intense fumarolic and seismic activity. Volcanic activity peaked in March–April 2009 when ash plume rose to a height of 5.5 km and extended laterally over more than 600 km. To understand the dynamics of the volcanic processes and to forecast the further course of...
