Mathematical Modeling in Geophysics, № 13, 2010

Electromagnetic fields that are observed on the Earth with the worldwide network of magnetic observatories as well as regional means when surveying the Earth's interior are conventionally considered to be force and one-mode fields.

For the numerical modeling of electromagnetic fields observed on the Earth, a force component of Maxwell's...

Electromagnetic methods for studying the Earth, electromagnetic techniques of geophysical prospecting, in particular, are conventionally based on the fact that any electromagnetic field, either observed on the Earth or artificially excited by generators, satisfy Maxwell's equations and is analytically described by these equations.

This opinion is so popular among geophysicists...

In this paper, a high-tech expert system EEDB for solving a wide range of seismological research tasks is proposed. The logical and functional structure as well as results of the algorithms usage for the analysis of seismic processes are considered. The algorithms allow us to calculate and to visualize maps...

Seismic observations in the Altai-Sayansk region, one of seismic-prone zones in Russia, are a part of the federal observations over natural and man-caused factors. The territory of the region in question makes more than 1.5 ∙ 106 km2 includes 13 subjects of the Russian Federation and three border areas...

The form of the equation of motion of porous media in terms of velocities, stresses and pressure as a symmetric t-hyperbolic system has been obtained.

Mean value relations for a vector of displacement of an elastic porous body and a pore pressure for a poroelastic static system, when mass forces and energy dissipation are absent, are obtained.

A developed toolkit (parallel programs and visualization tools) for the numerical simulation of the elastic wave propagation in 3D and 2D nonhomogeneous elastic media, comprising cavernous inclusions applicable to the on-site inspection, is described. According to the results obtained, groups of waves were identified, and synthetic data reflecting the influence...

An Expert Database on the Earth Impact Structures (EDEIS) has been compiled and is being maintained in the Tsunami Laboratory of the Institute of Computational Mathematics and Mathematical Geophysics of SB RAS in Novosibirsk. The database has been developed on the basis of the catalog of Earth impact structures that...

A new method for the tsunami wave ray construction is proposed. It is based on isochrones that are built with the use of the wave travel times to a tsunami source. The wave ray approximation is determined as a broken line passing through intersection points of identical time isochrones from...

In a subduction zone, a tsunami source is usually situated above the continental bottom slope. Due to the wave refraction, the opposite slope of a deep water trench works like an optical lens for tsunami waves. The tsunami propagation process is studied using the wave-ray approximation. The tsunami amplitude reduction...

Methods for computing wave kinematics are wide-spread for studying the wave propagation in non-homogeneous media. Exact analytical solutions for nontrivial media are needed for testing such methods. The formula describing the wave-front shape has been found for some media with a power dependence of conductivity on only one spatial coordinate...

A brief review of the author's catalog of the Earth's Impact structures, presented on the site of ICM&MG, is given in this paper. For the research into general laws of distribution with space of the impact structures compiling the catalog and for the analysis of their parameters it is offered...

The inverse problem to infer the initial water displacement is treated as an ill-posed problem of the hydrodynamic inversion of tsunami tide gauge records. To this end, we have developed a technique based on the least square inversion and a truncated SVD approach. The proposed filtering technique essentially improves the...