The large buried anticline in the Kizil zone of the southern Urals

Research performed by the authors, the data of drilling of deep boreholes, and analysis of geophysical materials have shown that the tectonics of the Kizil zone is characterized by development of thrust dislocation and inconsistency of exposed and deep structural plans, when structures developed at the surface and those originated at depth differ both in sizes and specific features of their morphology. The allochthonous Gusikhin zone has been substantiated. In the structure of underthrust deposits, there was recorded uplifting of Lower Carboniferous layers towards the central part of the Kizil zone and the formation of a large buried anticline.     

Ground Geophysical Surveys: Measuring Tools

The paper considers some original strainmeters and gravitoinertial instruments designed at the Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. The instruments are successfully used for measuring the Earth’s gravitational field, tilts, and deformations of the Earth’s crust in solving a number of applied and fundamental problems in geophysics and geodynamics, in particular, evaluating and monitoring the stability of environmentally hazardous engineering and construction objects (dams, hydroelectric dams, nuclear power plants, oil and gas pipelines, etc.), searching for the zones of weakness in the Earth’s crust, identifying precursors of natural and technological disasters, studying the Earth’s global characteristics (lunar–solar tides, irregularity of the Earth’s rotation, translational oscillations of the Earth’s core, and azimuthal shifts of lithosphere blocks).     

Long base hydrostatic level

The measurement capabilities of the hydrostatic level with a base of 1–3 km are described. The paper presents physical assessments of the effects related to the influence of changes in the parameters of meteorological conditions (atmospheric pressure, temperature, and its gradients along a track). The dynamic characteristics of the instrument and its limiting resolution, determined by both its own thermal fluctuations and the influence of seismic noise, are considered. A new radiotechnical method for measuring variations if the fluid level in the measuring vessel is discussed, characterized by a simple and reliable design and a large dynamic measurement range while maintaining the high sensitivity necessary for constructing long base systems.     

Gradiometric seismoreceiver with a magnetic suspension in the problems of operative earthquake forecasting

The problems of nonconventional application of torsional mechanical systems as original seismoreceivers are considered. The possibility to update the existing gradiometers for performing measurements on a mobile base and their utilization in solving the problems of investigations of peculiarities of a microseismic background with the aim of forecasting earthquakes is discussed in detail. It is shown that torsional systems with a contactless magnetic suspension meet many of the requirements for such type of devices and hardware complexes for the efficient solution of the problem stated can be developed.     

On the residuals in asteroid catalogs and a possible nongravitational effect

Based on numerical calculations of the evolution of asteroid orbits, we concluded in one of our previous papers that a nongravitational effect causing the spatial separation of asteroids with different albedos and with sizes of tens of kilometers could act in the Solar system. To find new arguments, we have analyzed the residuals in the catalogs of asteroid orbits for 1996 and 2006. The dependences pointing to the possibility of a nongravitational effect for orbits with larger residuals have been found to be more distinct than those for orbits with smaller residuals. This result may be considered as an indirect confirmation of the above nongravitational effect.     

Additional criteria for identifying the asteroid families and confirmation of the effect of spatial separation of family members according to their albedos

The D(a) distribution of asteroid sizes by their semimajor axes and the N(p) distribution of the number of asteroids by their albedo values for individual families are used to isolate the asteroid families more clearly. The families identified by Masiero et al. (2013) are analyzed with the use of these distributions, and correctly and incorrectly isolated families are found. A reduction in the mean albedo with increasing semimajor axis is observed for almost all correctly identified families that are not truncated by resonances. This reduction is statistically significant for the majority of these families. Not a single family exhibits a statistically significant increase in albedo. This confirms our previous conclusions that a nongravitational effect acting in the asteroid belt results in the spatial separation of asteroids with different albedos.     

Isotope-Hydrochemical Study of Natural Waters on the Western Border of the Ufa Plateau

Water Resources - Based on studies conducted in 2017, the features of formation and changes in the isotopic (δ18O and δ2H) and chemical composition of natural waters on the western border...