Comparison of straight-ray and curved-ray surface wave tomography approaches in near-surface studies
<p>Surface waves are widely used to model shear-wave velocity of the subsurface. Surface wave tomography (SWT) has recently gained popularity for near-surface studies. Some researchers have used straight-ray SWT in which it is assumed that surface waves propagate along the straight line betwee...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2022-10-01
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| Series: | Solid Earth |
| Online Access: | https://se.copernicus.org/articles/13/1569/2022/se-13-1569-2022.pdf |
| _version_ | 1811250799662071808 |
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| author | M. Karimpour E. Slob L. V. Socco |
| author_facet | M. Karimpour E. Slob L. V. Socco |
| author_sort | M. Karimpour |
| collection | DOAJ |
| description | <p>Surface waves are widely used to model shear-wave
velocity of the subsurface. Surface wave tomography (SWT) has recently
gained popularity for near-surface studies. Some researchers have used
straight-ray SWT in which it is assumed that surface waves propagate along
the straight line between receiver pairs. Alternatively, curved-ray SWT can
be employed by computing the paths between the receiver pairs using a
ray-tracing algorithm. The SWT is a well-established method in seismology and
has been employed in numerous seismological studies. However, it is
important to make a comparison between these two SWT approaches for
near-surface applications since the amount of information and the level of
complexity in near-surface applications are different from seismological studies. We
apply straight-ray and curved-ray SWT to four near-surface examples and
compare the results in terms of the quality of the final model and the
computational cost. In three examples we optimise the shot positions to
obtain an acquisition layout which can produce high coverage of dispersion
curves. In the other example, the data have been acquired using a typical
seismic exploration 3D acquisition scheme. We show that if the source
positions are optimised, the straight-ray can produce S-wave velocity models
similar to the curved-ray SWT but with lower computational cost than the
curved-ray approach. Otherwise, the improvement of inversion results from
curved-ray SWT can be significant.</p> |
| first_indexed | 2024-04-12T16:10:08Z |
| format | Article |
| id | doaj.art-a5f9b9a70b194f3bab917bbcf6573a6c |
| institution | Directory Open Access Journal |
| issn | 1869-9510 1869-9529 |
| language | English |
| last_indexed | 2024-04-12T16:10:08Z |
| publishDate | 2022-10-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Solid Earth |
| spelling | doaj.art-a5f9b9a70b194f3bab917bbcf6573a6c2022-12-22T03:25:56ZengCopernicus PublicationsSolid Earth1869-95101869-95292022-10-01131569158310.5194/se-13-1569-2022Comparison of straight-ray and curved-ray surface wave tomography approaches in near-surface studiesM. Karimpour0E. Slob1L. V. Socco2Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Turin, 10129, ItalyDepartment of Geoscience and Engineering, Delft University of Technology, Delft, 2628 CN, NetherlandsDepartment of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Turin, 10129, Italy<p>Surface waves are widely used to model shear-wave velocity of the subsurface. Surface wave tomography (SWT) has recently gained popularity for near-surface studies. Some researchers have used straight-ray SWT in which it is assumed that surface waves propagate along the straight line between receiver pairs. Alternatively, curved-ray SWT can be employed by computing the paths between the receiver pairs using a ray-tracing algorithm. The SWT is a well-established method in seismology and has been employed in numerous seismological studies. However, it is important to make a comparison between these two SWT approaches for near-surface applications since the amount of information and the level of complexity in near-surface applications are different from seismological studies. We apply straight-ray and curved-ray SWT to four near-surface examples and compare the results in terms of the quality of the final model and the computational cost. In three examples we optimise the shot positions to obtain an acquisition layout which can produce high coverage of dispersion curves. In the other example, the data have been acquired using a typical seismic exploration 3D acquisition scheme. We show that if the source positions are optimised, the straight-ray can produce S-wave velocity models similar to the curved-ray SWT but with lower computational cost than the curved-ray approach. Otherwise, the improvement of inversion results from curved-ray SWT can be significant.</p>https://se.copernicus.org/articles/13/1569/2022/se-13-1569-2022.pdf |
| spellingShingle | M. Karimpour E. Slob L. V. Socco Comparison of straight-ray and curved-ray surface wave tomography approaches in near-surface studies Solid Earth |
| title | Comparison of straight-ray and curved-ray surface wave tomography approaches in near-surface studies |
| title_full | Comparison of straight-ray and curved-ray surface wave tomography approaches in near-surface studies |
| title_fullStr | Comparison of straight-ray and curved-ray surface wave tomography approaches in near-surface studies |
| title_full_unstemmed | Comparison of straight-ray and curved-ray surface wave tomography approaches in near-surface studies |
| title_short | Comparison of straight-ray and curved-ray surface wave tomography approaches in near-surface studies |
| title_sort | comparison of straight ray and curved ray surface wave tomography approaches in near surface studies |
| url | https://se.copernicus.org/articles/13/1569/2022/se-13-1569-2022.pdf |
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