Coherence filtering of CMP records and dynamic characteristics of P- and S-refracted waves in the upper part of the Earth's crust
https://doi.org/10.18303/2619-1563-2026-1-80
Abstract
The article presents the results of processing detailed CDP-data using the dynamic conversion method. An algorithm for separating coherent refracted waves of the first and subsequent arrivals has been developed, based on the F–K filtering of seismograms. It was determined that the shape of the spectra of refracted P- and S-waves is bell-shaped, with a pronounced predominant frequency (varying in the ranges of 15–27 and 12–17 Hz), the spectra of the original recordings are low-quality, without obvious maxima. Information on the dynamics of refracted waves formed in the upper crust of folded systems was obtained in the 1-SB profile: blocks ranging from 5 to 60–300 km in length, separated by zones with a reduced amplitude of coherent waves and sizes up to 10 km, were identified based on sharply changing frequency spectra, amplitude, and attenuation coefficient.
Keywords
spatial coherence,
refracted waves,
dynamic conversion method,
1-SB reference profile,
upper crust,
wave field dynamics
Supporting agencies: the study was carried out within the framework of the state assignments of the FRC “Unified Geophysical Survey RAS” (project No. 075-00609-26) using data obtained at unique scientific facility “Seismic infrasound complex for monitoring the Arctic cryolithozone and complex for continuous seismic monitoring of the Russian Federation, adjacent territories and the world” and IPGG SB RAS (project No. FWZZ-2026-0050)
About the Authors
P. O. Polianskii
Altai-Sayan Branch of the Federal Research Center, Unified Geophysical Survey, RAS
Russian Federation
Russian Federation
Pavel O. Polianskii
Koptyug Ave., 3, Novosibirsk, 630090
A. F. Emanov
Altai-Sayan Branch of the Federal Research Center, Unified Geophysical Survey, RAS
Russian Federation
Russian Federation
Alexandr F. Emanov
Koptyug Ave., 3, Novosibirsk, 630090
A. S. Salnikov
Trofimuk Institute of Petroleum Geology and Geophysics, SB RAS
Russian Federation
Russian Federation
Alexandr S. Salnikov
Koptyug Ave., 3, Novosibirsk, 630090
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Review
For citations:
Polianskii P.O., Emanov A.F., Salnikov A.S. Coherence filtering of CMP records and dynamic characteristics of P- and S-refracted waves in the upper part of the Earth's crust. Russian Journal of Geophysical Technologies. 2026;(1):80-97. (In Russ.) https://doi.org/10.18303/2619-1563-2026-1-80
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