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Geoinformatika 2019; 4(72) : 65-73

УДК 550.834; 550.34.06

ADAPTIVE SEISMIC COMPLEX FOR ENGINEERING GEOPHYSICS

D.M. Gryn1, S.T. Verbytsky2, O.V. Dmytrenko1

1Institute of Geophysics, National Academy of Science of Ukraine, Palladin Ave. 32, Kyiv, 03680, Ukraine.
2Institute of Geophysics, National Academy of Science of Ukraine, Department of seismicity of the Carpathian region, st. Yaroslavtnka, 27, Lviv, 79000, Ukraine.

Purpose. To create a modern adaptive seismic complex for solving problems of engineering geophysics.The article describes all the components of the seismic complex. It consists of an adaptive seismic wave source that can generate complex shape signals. The waveform is calculated at each point of generation. The signal is composed of frequencies that are strongly absorbed by the earth Multiple generation leads to the accumulation of signals. As a result, we have high seismic resolution. The seismic control system controls the electrical source. Universal digital seismic stations are used to record seismic information. These stations were made at the Institute of Geophysics of NAS of Ukraine. They are small in weight and size. Seismic stations have a long battery life. The sampling rate of the seismic data is 4000 Hz. Seismic information is accumulated in the seismic station and can be copied through a USB port or a wireless WiFi connection. The system of remote control over the technical condition of the station has been developed

Design/methodology/approach. Seismic stations are installed over some distance on the ground surface and the source generates complex signals. The seismic wave is reflected from geological layers and it is recorded by digital seismic stations of type SV. The seismic wave source is moved to a new point and the next seismic wave is generated. Upon completion of the exploration work, the seismic data is transcribed from the stations. The resulting material is processed by special programs.

Findings. Adaptive seismic complex was created to solve a wide range of problems of engineering geophysics. His field tests were completed. Work methodology and software have been used in many scientific and technical projects. We can use any number of seismic stations, and as a result we have different profile lengths. The sensors can be of different polarity — three-component, horizontal or vertical. The use of three components makes it possible to divide the wave field into components. The use of polarizing filters makes it easier to determine the types of waves. They can be low frequency or high frequency. GPS systems give seismic stations the correct time and coordinates. The obtained seismic data are processed by special software.

Practical value/implications: The use of a seismic complex is possible for many tasks. Conventionally, these tasks can be divided into two groups. The first is the determination of the physical properties of the geological environment to solve the problems outlined by the State Building Standards (DBS), the second large group is related to the need to study the surface geological structure, in particular:

  • The seismic complex can be used to determine the presence, shape and depth of the occurrence of underground historical sites by a non-destructive method in a protected area;
  • seismic zoning and seismic monitoring with allocation of zones of active disturbances and local moving geological blocks (necessary for gas and oil pipelines, ammonia pipelines, railways);
  • solution of environmental problems, in particular the detection of zones of underground penetration into the surface water of contaminated water from the reservoirs of mining and processing enterprises;
  • monitoring the status of dams and surrounding areas;
  • search for karst cavities, catacombs and abandoned mines under industrial and residential sites;
  • localization of territory with landslides.

 

Keywords: spectrum of ratio signal-noise, adaptive research, adaptive seismic complex, resonance seismic source, seismic station.

The full text of papers

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Received 12/11/2019