Seismic instruments: article

Development and application of a portable vibroseis source for acquisition and analysis of seismic surface wave data
A.V. Yablokov 1,2,3 P.A. Dergach 1,3 A.S. Serdyukov 1,2,3 S.S. Polozov 1
1 Trofimuk Institute of Petroleum Geology and Geophysics SB RAS 2 Chinakal Institute of Mining SB RAS 3 Novosibirsk State University
Journal: Seismic instruments
Tome: 58
Number: 4
Year: 2022
Pages: 5-18
UDK: 550.34.016, 550.344.56
DOI: 10.21455/si2022.4-1
Keywords: engineering seismology, near-surface monitoring, vibrator source, surface waves, spectral analysis, dispersion curve, shear-waves velocity model
Аnnotation: The paper is devoted to the development of a portable vibrating installation and the study of its applicability in the generation of seismic waves. The solution of the developing a portable vibrating unit problem that is capable of generating a stable seismic signal in the target frequency range is actual. The existing solutions are bulky and do not have a wide application in engineering seismic exploration. The paper describes in detail the design of the vibrator source, stages of the output laptop signals testing, a power amplifier and a haptic transducer controlling. The signals with different frequency sweep have been used during field acquisition. The registered data have been proceeded using the method of multichannel analysis of surface waves. As a result of comparing of the amplitude spectra and of the dispersion images of the surface wave, it was found that the hyperbolic (low-dwell) sweep signal generates a surface waves train in the all frequency range (10–150 Hz) and does not produce of high-frequency interference waves in the cement concrete pavement as opposed to other sweep signals and sledgehammers. Based on the field data processing results, we restored a one-dimensional shear-wave velocity model for soils and concluded about the success, practicability and increased (compared to a sledgehammer) efficiency of using the developed vibrator source for acquisition and analyzing surface wave data for engineer-ing seismology problems. The undoubted advantages of using a vibration source are the controllability of the frequency content and its repeatability. The use of such vibration installations in combination with stationary seismic recording systems is a promising direction for solving seismic monitoring problems.