Field testing of a portable vibration seismic source of S-waves for detailed near-surface studies
DOI:
https://doi.org/10.21638/spbu07.2024.202Abstract
We report the results of testing a portable vibration seismic source designed for generating S-waves in the frequency range from 5 to 200 Hz (designed at the Institute of Petroleum Geology and Geochemistry SB RAS based on serial low-frequency acoustic transducers). We first describe the source design and then present the results of field experiments and their comparison to the impulse source of S-waves (sledgehammer against the opposite walls of a trench). Analysis of experimental data showed that even with an average noise level (constant wind of 5–10 m/s and construction work at a distance of about 200 meters from the profile) it is possible to reliably trace refracted waves at distances of up to 100 meters or more with a signal-to-noise ratio of 5 or higher. We used 60-second linear sweep signal with a frequency changing from 20 to 100 Hz. The source of shear waves can be used in near-surface seismic studies using the methods of refracted waves, multichannel analysis of surface Love waves (MALW), as well as reflected SH waves (RPM). The last two methods are important for studying geological sections with velocity inversions with depth which is extremely important when working in permafrost regions since the refracted wave method (REM) is not effective in this case. The use of the vibration S-wave source may significantly suppress surface waves.
Keywords:
Near-surface seismic, vibration source, shear waves, refracted wave method, low-frequency acoustic transducer, sweep signal
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Articles of "Vestnik of Saint Petersburg University. Earth Sciences" are open access distributed under the terms of the License Agreement with Saint Petersburg State University, which permits to the authors unrestricted distribution and self-archiving free of charge.
