Tomographic resolution of ray and finite-frequency methods: a membrane-wave investigation
The purpose of this study is to evaluate the resolution potential of current finite-frequency approaches to tomography, and to do that in a framework similar to that of global scale seismology. According to our current knowledge and understanding, the only way to do this is by constructing a large s...
| Main Authors: | , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
2009
|
| _version_ | 1797053825543045120 |
|---|---|
| author | Peter, D Boschi, L Woodhouse, J |
| author_facet | Peter, D Boschi, L Woodhouse, J |
| author_sort | Peter, D |
| collection | OXFORD |
| description | The purpose of this study is to evaluate the resolution potential of current finite-frequency approaches to tomography, and to do that in a framework similar to that of global scale seismology. According to our current knowledge and understanding, the only way to do this is by constructing a large set of 'ground-truth' synthetic data computed numerically (spectral elements, finite differences, etc.), and then to invert them using the various available linearized techniques. Specifically, we address the problem of using surface wave data to map phase-velocity distributions. Our investigation is strictly valid for the propagation of elastic waves on a spherical, heterogeneous membrane, and a good analogue for the propagation of surface waves within the outermost layers of the Earth. This amounts to drastically reducing the computational expense, with a certain loss of accuracy if very short-wavelength features of a strongly heterogeneous Earth are to be modelled. Our analysis suggests that a single-scattering finite-frequency approach to tomography, with sensitivity kernels computed via the adjoint method, is significantly more powerful than ray-theoretical methods, as a tool to image the fine structure of the Earth. © 2009 The Authors Journal compilation © 2009 RAS. |
| first_indexed | 2024-03-06T18:49:00Z |
| format | Journal article |
| id | oxford-uuid:0f87e5e6-6b39-478e-83ad-da9c93556756 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T18:49:00Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | oxford-uuid:0f87e5e6-6b39-478e-83ad-da9c935567562022-03-26T09:51:42ZTomographic resolution of ray and finite-frequency methods: a membrane-wave investigationJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:0f87e5e6-6b39-478e-83ad-da9c93556756EnglishSymplectic Elements at Oxford2009Peter, DBoschi, LWoodhouse, JThe purpose of this study is to evaluate the resolution potential of current finite-frequency approaches to tomography, and to do that in a framework similar to that of global scale seismology. According to our current knowledge and understanding, the only way to do this is by constructing a large set of 'ground-truth' synthetic data computed numerically (spectral elements, finite differences, etc.), and then to invert them using the various available linearized techniques. Specifically, we address the problem of using surface wave data to map phase-velocity distributions. Our investigation is strictly valid for the propagation of elastic waves on a spherical, heterogeneous membrane, and a good analogue for the propagation of surface waves within the outermost layers of the Earth. This amounts to drastically reducing the computational expense, with a certain loss of accuracy if very short-wavelength features of a strongly heterogeneous Earth are to be modelled. Our analysis suggests that a single-scattering finite-frequency approach to tomography, with sensitivity kernels computed via the adjoint method, is significantly more powerful than ray-theoretical methods, as a tool to image the fine structure of the Earth. © 2009 The Authors Journal compilation © 2009 RAS. |
| spellingShingle | Peter, D Boschi, L Woodhouse, J Tomographic resolution of ray and finite-frequency methods: a membrane-wave investigation |
| title | Tomographic resolution of ray and finite-frequency methods: a membrane-wave investigation |
| title_full | Tomographic resolution of ray and finite-frequency methods: a membrane-wave investigation |
| title_fullStr | Tomographic resolution of ray and finite-frequency methods: a membrane-wave investigation |
| title_full_unstemmed | Tomographic resolution of ray and finite-frequency methods: a membrane-wave investigation |
| title_short | Tomographic resolution of ray and finite-frequency methods: a membrane-wave investigation |
| title_sort | tomographic resolution of ray and finite frequency methods a membrane wave investigation |
| work_keys_str_mv | AT peterd tomographicresolutionofrayandfinitefrequencymethodsamembranewaveinvestigation AT boschil tomographicresolutionofrayandfinitefrequencymethodsamembranewaveinvestigation AT woodhousej tomographicresolutionofrayandfinitefrequencymethodsamembranewaveinvestigation |