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Article: The computation of 3-D finite-frequency sensitivity kernels for surface-waves
Title | The computation of 3-D finite-frequency sensitivity kernels for surface-waves |
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Authors | |
Keywords | Fresnel zone method Ray theory 3-D sensitivity kernels Finite-frequency |
Issue Date | 2007 |
Citation | Journal of Chengdu University of Technology (Science and Technology Edition), 2007, v. 34, n. 3, p. 340-347 How to Cite? |
Abstract | High resolution surface-wave tomography must overcome the high frequency approximation assumption of ray theory and take the finite frequency effects into account. In this paper, the authors present a method to compute 3-D finite frequency sensitive kernels for surface-waves. This method can directely compute the surface-wave eigenvalues and eigenfunctions for the layered spherical earth model and the Earth-flattening procedure to approximately compute surface -wave dispersion for this model is not needed. The authors compute the 3-D sensitive kernels for phase-delay, amplitude perturbation and group-delay and discuss the finite-frequency effects in surface-waves. The analysis reveals that the 3-D phase-delay sensitivity kernels for surface waves bear a great resemblance to frechet kernels for the 2-D body-wave traveltimes. This suggests the 2-D propagation nature of surface waves. As far as the phase speed data are concerned, the Fresnel zone method is proper for the inversion of low-frequency waves, while the ray theory is proper for the inversion of high-frequency waves. However, the finite-frequency method should be taken for the inversion of intermediate-frequency waves. The terms high and low are resolution-dependent. The group dispersion data are better for the inversion of the fine structure of the crust and the upper mantle. But the strong sidebands of the group-delay kernels may lead to unstability of the inversion. |
Persistent Identifier | http://hdl.handle.net/10722/265522 |
ISSN | 2023 SCImago Journal Rankings: 0.283 |
DC Field | Value | Language |
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dc.contributor.author | Liu, Kui | - |
dc.contributor.author | Cheng, Xian Qiong | - |
dc.contributor.author | Zhu, Jie Shou | - |
dc.contributor.author | Kong, Chun Yu | - |
dc.date.accessioned | 2018-12-03T01:20:55Z | - |
dc.date.available | 2018-12-03T01:20:55Z | - |
dc.date.issued | 2007 | - |
dc.identifier.citation | Journal of Chengdu University of Technology (Science and Technology Edition), 2007, v. 34, n. 3, p. 340-347 | - |
dc.identifier.issn | 1671-9727 | - |
dc.identifier.uri | http://hdl.handle.net/10722/265522 | - |
dc.description.abstract | High resolution surface-wave tomography must overcome the high frequency approximation assumption of ray theory and take the finite frequency effects into account. In this paper, the authors present a method to compute 3-D finite frequency sensitive kernels for surface-waves. This method can directely compute the surface-wave eigenvalues and eigenfunctions for the layered spherical earth model and the Earth-flattening procedure to approximately compute surface -wave dispersion for this model is not needed. The authors compute the 3-D sensitive kernels for phase-delay, amplitude perturbation and group-delay and discuss the finite-frequency effects in surface-waves. The analysis reveals that the 3-D phase-delay sensitivity kernels for surface waves bear a great resemblance to frechet kernels for the 2-D body-wave traveltimes. This suggests the 2-D propagation nature of surface waves. As far as the phase speed data are concerned, the Fresnel zone method is proper for the inversion of low-frequency waves, while the ray theory is proper for the inversion of high-frequency waves. However, the finite-frequency method should be taken for the inversion of intermediate-frequency waves. The terms high and low are resolution-dependent. The group dispersion data are better for the inversion of the fine structure of the crust and the upper mantle. But the strong sidebands of the group-delay kernels may lead to unstability of the inversion. | - |
dc.language | eng | - |
dc.relation.ispartof | Journal of Chengdu University of Technology (Science and Technology Edition) | - |
dc.subject | Fresnel zone method | - |
dc.subject | Ray theory | - |
dc.subject | 3-D sensitivity kernels | - |
dc.subject | Finite-frequency | - |
dc.title | The computation of 3-D finite-frequency sensitivity kernels for surface-waves | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.scopus | eid_2-s2.0-34250749012 | - |
dc.identifier.volume | 34 | - |
dc.identifier.issue | 3 | - |
dc.identifier.spage | 340 | - |
dc.identifier.epage | 347 | - |
dc.identifier.eissn | 1671-9727 | - |
dc.identifier.issnl | 1671-9727 | - |