Effects of surface scattering in full-waveform inversion
In full-waveform inversion of seismic body waves, often the free surface is ignored on grounds of computational efficiency. A synthetic study was performed to investigate the effects of this simplification. In terms of size and frequency, the test model and data conform to a real long-offset survey...
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| Format: | Article |
| Language: | en_US |
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Society of Exploration Geophysicists
2010
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| Online Access: | http://hdl.handle.net/1721.1/60348 |
| _version_ | 1826206855897022464 |
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| author | Rondenay, Stephane Bleibinhaus, Florian |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Rondenay, Stephane Bleibinhaus, Florian |
| author_sort | Rondenay, Stephane |
| collection | MIT |
| description | In full-waveform inversion of seismic body waves, often the free surface is ignored on grounds of computational efficiency. A synthetic study was performed to investigate the effects of this simplification. In terms of size and frequency, the test model and data conform to a real long-offset survey of the upper crust across the San Andreas fault. Random fractal variations are superimposed on a background model with strong lateral and vertical velocity variations ranging from 1200 to 6800 m/s. Synthetic data were computed and inverted for this model and different topographies. A fully viscoelastic time-domain code was used to synthesize the seismograms, and a viscoacoustic frequency-domain code was utilized to invert them. The inversion was focused on early arrivals, which are dominated by P-waves but also contain strong P-Rayleigh wave conversions from the near-field of the receiver. Resulting waveform models show artifacts and a loss of resolution from neglecting the free surface in the inversion, but the inversions are stable, and they still improve the resolution of kinematic models. The extent of deterioration depends more on the subsurface than on the surface structure. Inversion results were improved at no additional expense by introducing a weak contrast along a staircase function above shots and receivers. |
| first_indexed | 2024-09-23T13:39:37Z |
| format | Article |
| id | mit-1721.1/60348 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:39:37Z |
| publishDate | 2010 |
| publisher | Society of Exploration Geophysicists |
| record_format | dspace |
| spelling | mit-1721.1/603482022-09-28T15:20:55Z Effects of surface scattering in full-waveform inversion Rondenay, Stephane Bleibinhaus, Florian Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Rondenay, Stephane Rondenay, Stephane Bleibinhaus, Florian In full-waveform inversion of seismic body waves, often the free surface is ignored on grounds of computational efficiency. A synthetic study was performed to investigate the effects of this simplification. In terms of size and frequency, the test model and data conform to a real long-offset survey of the upper crust across the San Andreas fault. Random fractal variations are superimposed on a background model with strong lateral and vertical velocity variations ranging from 1200 to 6800 m/s. Synthetic data were computed and inverted for this model and different topographies. A fully viscoelastic time-domain code was used to synthesize the seismograms, and a viscoacoustic frequency-domain code was utilized to invert them. The inversion was focused on early arrivals, which are dominated by P-waves but also contain strong P-Rayleigh wave conversions from the near-field of the receiver. Resulting waveform models show artifacts and a loss of resolution from neglecting the free surface in the inversion, but the inversions are stable, and they still improve the resolution of kinematic models. The extent of deterioration depends more on the subsurface than on the surface structure. Inversion results were improved at no additional expense by introducing a weak contrast along a staircase function above shots and receivers. Shell International Exploration and Production B.V. 2010-12-21T21:24:26Z 2010-12-21T21:24:26Z 2009-12 2009-05 Article http://purl.org/eprint/type/JournalArticle 0016-8033 http://hdl.handle.net/1721.1/60348 Bleibinhaus, Florian, and Stephane Rondenay. “Effects of surface scattering in full-waveform inversion.” Geophysics 74.6 (2009): WCC69-WCC77. ©2009 Society of Exploration Geophysicists en_US http://dx.doi.org/10.1190/1.3223315 Geophysics Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Society of Exploration Geophysicists MIT web domain |
| spellingShingle | Rondenay, Stephane Bleibinhaus, Florian Effects of surface scattering in full-waveform inversion |
| title | Effects of surface scattering in full-waveform inversion |
| title_full | Effects of surface scattering in full-waveform inversion |
| title_fullStr | Effects of surface scattering in full-waveform inversion |
| title_full_unstemmed | Effects of surface scattering in full-waveform inversion |
| title_short | Effects of surface scattering in full-waveform inversion |
| title_sort | effects of surface scattering in full waveform inversion |
| url | http://hdl.handle.net/1721.1/60348 |
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