MSU-FS1D

MSU_FS1D software’s main purpose is to solve straight and inverse FES problems. It allows the calculation of all the components of a low-frequency field of basic dipole sources on the surface of a horizontally layered medium (taking into account its polarization). The program’s graphic user interface makes it possible to effectively achieve interpretation of FES curves.

The MSU_FS1D program makes it possible to solve the fundamental problem of FES method – the calculation of horizontal electrical (Ex and Ey), horizontal and vertical magnetic (Hx, Hy, Hz) components of the field of horizontal electrical (AB) and vertical magnetic (Q) dipoles on the surface of a horizontally layered medium in the quasi-stationary approximation. To increase accuracy and speed of calculation, this program utilizes a whole series of methods, such as effective positioning of integrands into a bell-shaped form, use of linear filters of variable length, transition to asymptotic formulas in the near and far zone, and others. The results of program testing have shown that it ensures accuracy to 1% over a wide range of frequencies, arrays and parameters of the section.

The graphic user interface of MSU_FS1D program is designed for the Microsoft Windows family of operating systems. It allows the user to examine and change the parameters of the medium model and sounding setup, analyze and save the results of straight problems, output and edit field data, carry out curve selection, and so on.

Areas of application for MSU_FS1D:

• Modeling with the purpose of analyzing the structure of the variable field on the surface of layered sections, as well as detecting the advantages and deficiencies in the measurement of various field components and determining the optimum setup parameters for specific geoelectric sections.
• Interpretation of field data obtained in recent years from a number of regions on the Russian plate. Examples
• Teaching geophysics students methods of computer interpretation during Co-op Placement Terms.

Together with a generator and measuring equipment, and editing and modeling FES data software, the MSU_FS1D program makes up a complete acquisition system for FES surveys.