Full-waveform inversion of high-frequency teleseismic body waves based on multiple plane-wave incidence: methods and practical applications
Teleseismic full-waveform inversion has recently been applied to image subwavelength-scale lithospheric structures (typically a few tens of kilometers) by utilizing hybrid methods in which an efficient solver for the 1D background model is coupled with a full numerical solver for a small 3D target r...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Online Access: | https://hdl.handle.net/10356/164127 |
| _version_ | 1826123317543698432 |
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| author | Wang, Kai Wang, Yi Song, Xin Tong, Ping Liu, Qinya Yang, Yingjie |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Wang, Kai Wang, Yi Song, Xin Tong, Ping Liu, Qinya Yang, Yingjie |
| author_sort | Wang, Kai |
| collection | NTU |
| description | Teleseismic full-waveform inversion has recently been applied to image subwavelength-scale lithospheric structures (typically a few tens of kilometers) by utilizing hybrid methods in which an efficient solver for the 1D background model is coupled with a full numerical solver for a small 3D target region. Among these hybrid methods, the coupling of the fre-quency–wavenumber technique with the spectral element method is one of the most com-putationally efficient ones. However, it is normally based on a single plane-wave incidence, and thus cannot synthesize secondary global phases generated at interfaces outside the target area. To remedy the situation, we propose to use a multiple plane-wave injection method to include secondary global phases in the hybrid modeling. We investigate the performance of the teleseismic full-waveform inversion based on single and multiple plane-wave incidence through an application in the western Pyrenees and compare it with previously published images and the inversion based on a global hybrid method. In addi-tion, we also test the influence of Earth’s spherical curvature on the tomographic results. Our results demonstrate that the teleseismic full-waveform inversion based on a single plane-wave incidence can reveal complex lithospheric structures similar to those imaged using a global hybrid method and is reliable for practical tomography for small regions with an aperture of a few hundred kilometers. However, neglecting the Earth’s spherical curvature and secondary phases leads to errors on the recovered amplitudes of velocity anomalies (e.g., about 2.8% difference for density and VS, and 4.2% for VP on average). These errors can be reduced by adopting a spherical mesh and injecting multiple plane waves in the frequency–wavenumber-based hybrid method. The proposed plane-wave teleseismic full-waveform inversion is promising for mapping subwavelength-scale seismic structures using high-frequency teleseismic body waves ( > 1 Hz) including coda waves recorded at large N seismic arrays. |
| first_indexed | 2024-10-01T06:02:23Z |
| format | Journal Article |
| id | ntu-10356/164127 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:02:23Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1641272023-01-05T07:22:57Z Full-waveform inversion of high-frequency teleseismic body waves based on multiple plane-wave incidence: methods and practical applications Wang, Kai Wang, Yi Song, Xin Tong, Ping Liu, Qinya Yang, Yingjie School of Physical and Mathematical Sciences Asian School of the Environment Science::Geology Spectral Element Method Synthetic Seismograms Teleseismic full-waveform inversion has recently been applied to image subwavelength-scale lithospheric structures (typically a few tens of kilometers) by utilizing hybrid methods in which an efficient solver for the 1D background model is coupled with a full numerical solver for a small 3D target region. Among these hybrid methods, the coupling of the fre-quency–wavenumber technique with the spectral element method is one of the most com-putationally efficient ones. However, it is normally based on a single plane-wave incidence, and thus cannot synthesize secondary global phases generated at interfaces outside the target area. To remedy the situation, we propose to use a multiple plane-wave injection method to include secondary global phases in the hybrid modeling. We investigate the performance of the teleseismic full-waveform inversion based on single and multiple plane-wave incidence through an application in the western Pyrenees and compare it with previously published images and the inversion based on a global hybrid method. In addi-tion, we also test the influence of Earth’s spherical curvature on the tomographic results. Our results demonstrate that the teleseismic full-waveform inversion based on a single plane-wave incidence can reveal complex lithospheric structures similar to those imaged using a global hybrid method and is reliable for practical tomography for small regions with an aperture of a few hundred kilometers. However, neglecting the Earth’s spherical curvature and secondary phases leads to errors on the recovered amplitudes of velocity anomalies (e.g., about 2.8% difference for density and VS, and 4.2% for VP on average). These errors can be reduced by adopting a spherical mesh and injecting multiple plane waves in the frequency–wavenumber-based hybrid method. The proposed plane-wave teleseismic full-waveform inversion is promising for mapping subwavelength-scale seismic structures using high-frequency teleseismic body waves ( > 1 Hz) including coda waves recorded at large N seismic arrays. Ministry of Education (MOE) SciNet is funded by the Canada Foundation for Innovation; the Government of Ontario; Ontario Research Fund— Research Excellence; and the University of Toronto. K. W. (after January 2020) and Y. Y. are supported by the Australian Research Council Discovery Grants DP190102940. K. W. (before January 2020), X. S. (before July 2019), and Q. L. are supported by the Natural Sciences and Engineering Research Council (NSERC) Discovery Grant 487237. P. T. is supported by Singapore Ministry of Education (MOE) AcRF Tier-1 Grant 04MNP000559C230. 2023-01-05T07:22:56Z 2023-01-05T07:22:56Z 2022 Journal Article Wang, K., Wang, Y., Song, X., Tong, P., Liu, Q. & Yang, Y. (2022). Full-waveform inversion of high-frequency teleseismic body waves based on multiple plane-wave incidence: methods and practical applications. Bulletin of the Seismological Society of America, 112(1), 118-132. https://dx.doi.org/10.1785/0120210094 0037-1106 https://hdl.handle.net/10356/164127 10.1785/0120210094 2-s2.0-85130623662 1 112 118 132 en 04MNP000559C230 Bulletin of the Seismological Society of America © 2022 Seismological Society of America. All rights reserved. |
| spellingShingle | Science::Geology Spectral Element Method Synthetic Seismograms Wang, Kai Wang, Yi Song, Xin Tong, Ping Liu, Qinya Yang, Yingjie Full-waveform inversion of high-frequency teleseismic body waves based on multiple plane-wave incidence: methods and practical applications |
| title | Full-waveform inversion of high-frequency teleseismic body waves based on multiple plane-wave incidence: methods and practical applications |
| title_full | Full-waveform inversion of high-frequency teleseismic body waves based on multiple plane-wave incidence: methods and practical applications |
| title_fullStr | Full-waveform inversion of high-frequency teleseismic body waves based on multiple plane-wave incidence: methods and practical applications |
| title_full_unstemmed | Full-waveform inversion of high-frequency teleseismic body waves based on multiple plane-wave incidence: methods and practical applications |
| title_short | Full-waveform inversion of high-frequency teleseismic body waves based on multiple plane-wave incidence: methods and practical applications |
| title_sort | full waveform inversion of high frequency teleseismic body waves based on multiple plane wave incidence methods and practical applications |
| topic | Science::Geology Spectral Element Method Synthetic Seismograms |
| url | https://hdl.handle.net/10356/164127 |
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