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Fixed-source and fixed-receiver walkaway seismic noise tests: A field comparison
Vincent, Paul D. Tsoflias, Georgios P. Steeples, Don W. Sloan, Steven D.
Vincent, Paul D.
Tsoflias, Georgios P.
Steeples, Don W.
Sloan, Steven D.
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Abstract
Seismologists and geophysical literature often use the term “walkaway” to describe any survey used to analyze wavetrains based on source-to-receiver offset. A distinction should be made between receiver-group moveout (fixed-source walkaway) and source moveout (fixed-receiver walkaway) when multiple channels simultaneously record signal from multiple independent geophones. Three data sets are presented that illustrate this distinction: one collected in an area where a fixed-receiver walkaway survey recorded similar data and was more time efficient than a fixed-source walkaway survey, and two others collected in an area where dipping reflectors and laterally varying velocities caused the fixed-receiver walkaway data to be significantly different than the fixed-source walkaway data. The results show that, while still useful, clarity in recorded data is lost when fixed-receiver walkaway surveys are substituted for fixed-source walkaway surveys in areas with uneven surface topography, dipping interfaces, or laterally varying velocities. This is because walkaway seismograms are displayed by source-to-receiver offset, whereas neighboring traces do not correspond necessarily with neighboring raypaths or reflection points.
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This is the published version. Reuse is subject to Society of Exploration Geophysicists terms of use and conditions.
Date
2006-09-21
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Society of Exploration Geophysicists
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Keywords
Seismic waves, geophysical techniques, geophysical equipment
Citation
Paul D. Vincent, Georgios P. Tsoflias, Don W. Steeples, and Steve D. Sloan (2006). ”Fixed-source and fixed-receiver walkaway seismic noise tests: A field comparison.” Geophysics, 71(6), W41-W44. http://dx.doi.org/10.1190/1.2337573.