Anisotropic P-wave travel-time tomography implementing Thomsen's weak approximation in TOMO3D
Special issue Advances in seismic imaging across the scales.-- 20 pages, 10 figures, 9 tables, supplement https://doi.org/10.5194/se-10-1857-2019-supplement
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European Geosciences Union
2019-11
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dig-icm-es-10261-1950832020-12-12T16:54:58Z Anisotropic P-wave travel-time tomography implementing Thomsen's weak approximation in TOMO3D Meléndez, Adrià Jiménez-Tejero, C.E. Sallarès, Valentí Ranero, César R. Repsol Generalitat de Catalunya Special issue Advances in seismic imaging across the scales.-- 20 pages, 10 figures, 9 tables, supplement https://doi.org/10.5194/se-10-1857-2019-supplement We present the implementation of Thomsen’s weak anisotropy approximation for vertical transverse isotropy (VTI) media within TOMO3D, our code for 2-D and3-D joint refraction and reflection travel-time tomographic inversion. In addition to the inversion of seismic P-wave velocity and reflector depth, the code can now retrieve models of Thomsen’s parameters (δ and ε). Here, we test this new implementation following four different strategies on a canonical synthetic experiment in ideal conditions with the purpose of estimating the maximum capabilities and potential weak points of our modeling tool and strategies. First, we study the sensitivity of travel times to the presence of a 25 % anomaly in each of the parameters. Next, we invert for two combinations of parameters (v, δ, ε and v, δ, v⊥), following two inversion strategies, simultaneous and sequential, and compare the results to study their performance and discuss their advantages and disadvantages. Simultaneous inversion is the preferred strategy and the parameter combination (v, δ, ε) produces the best overall results. The only advantage of the parameter combination (v, δ, v⊥) is a better recovery of the magnitude of v. In each case, we derive the fourth parameter from the equation relating ε, v⊥ and v. Recovery of v, ε and v⊥ is satisfactory, whereas δ proves to be impossible to recover even in the most favorable scenario. However, this does not hinder the recovery of the other parameters, and we show that it is still possible to obtain a rough approximation of the δ distribution in the medium by sampling a reasonable range of homogeneous initial δ models and averaging the final δ models that are satisfactory in terms of data fit Adrià Meléndez and Clara Estela Jiménez are funded by Respol through the SOUND collaboration project with CSIC, and the work in this paper was conducted at the Grup de Recerca de la Generalitat de Catalunya 2009SGR146: Barcelona Center for Subsurface Imaging (B-CSI) Peer Reviewed 2019-11-21T10:02:49Z 2019-11-21T10:02:49Z 2019-11 2019-11-21T10:02:50Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.5194/se-10-1857-2019 issn: 1869-9510 e-issn: 1869-9529 Solid Earth 10: 1857-1876 (2019) http://hdl.handle.net/10261/195083 10.5194/se-10-1857-2019 http://dx.doi.org/10.13039/501100002809 Publisher's version https://doi.org/10.5194/se-10-1857-2019 Sí open European Geosciences Union |
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Special issue Advances in seismic imaging across the scales.-- 20 pages, 10 figures, 9 tables, supplement https://doi.org/10.5194/se-10-1857-2019-supplement |
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Repsol |
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Repsol Meléndez, Adrià Jiménez-Tejero, C.E. Sallarès, Valentí Ranero, César R. |
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Meléndez, Adrià Jiménez-Tejero, C.E. Sallarès, Valentí Ranero, César R. |
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Meléndez, Adrià Jiménez-Tejero, C.E. Sallarès, Valentí Ranero, César R. Anisotropic P-wave travel-time tomography implementing Thomsen's weak approximation in TOMO3D |
| author_sort |
Meléndez, Adrià |
| title |
Anisotropic P-wave travel-time tomography implementing Thomsen's weak approximation in TOMO3D |
| title_short |
Anisotropic P-wave travel-time tomography implementing Thomsen's weak approximation in TOMO3D |
| title_full |
Anisotropic P-wave travel-time tomography implementing Thomsen's weak approximation in TOMO3D |
| title_fullStr |
Anisotropic P-wave travel-time tomography implementing Thomsen's weak approximation in TOMO3D |
| title_full_unstemmed |
Anisotropic P-wave travel-time tomography implementing Thomsen's weak approximation in TOMO3D |
| title_sort |
anisotropic p-wave travel-time tomography implementing thomsen's weak approximation in tomo3d |
| publisher |
European Geosciences Union |
| publishDate |
2019-11 |
| url |
http://hdl.handle.net/10261/195083 http://dx.doi.org/10.13039/501100002809 |
| work_keys_str_mv |
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