Adjoint tomography of ambient noise data and teleseismic P waves : methodology and applications to central California
Adjoint tomography has been recently applied to ambient seismic noise and teleseismic P waves separately to unveil fine-scale lithospheric structures beyond the resolving ability of traditional ray-based traveltime tomography. In this study, we propose an inversion scheme that alternates between fre...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2021
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| Online Access: | https://hdl.handle.net/10356/153552 |
| _version_ | 1811677849633947648 |
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| author | Wang, Kai Yang, Yingjie Jiang, Chengxin Wang, Yi Tong, Ping Liu, Tianshi Liu, Qinya |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Wang, Kai Yang, Yingjie Jiang, Chengxin Wang, Yi Tong, Ping Liu, Tianshi Liu, Qinya |
| author_sort | Wang, Kai |
| collection | NTU |
| description | Adjoint tomography has been recently applied to ambient seismic noise and teleseismic P waves separately to unveil fine-scale lithospheric structures beyond the resolving ability of traditional ray-based traveltime tomography. In this study, we propose an inversion scheme that alternates between frequency-dependent traveltime inversions of ambient noise surface waves and waveform inversions of teleseismic P waves to take advantage of their complementary sensitivities to the Earth's structure. We apply our method to ambient noise empirical Green's functions from 60 virtual sources, direct P and scattered waves from 11 teleseismic events recorded by a dense linear array (∼7 km station spacing) and other regional stations (∼40 km average station spacing) in central California. To evaluate the performance of the method, we compare tomographic results from ambient noise adjoint tomography, full-waveform inversion of teleseismic P waves, and the alternating inversion of the two data sets. Both applications to practical field data sets and synthetic checkerboard tests demonstrate the advantage of the alternating inversion over individual inversions as it combines the complementary sensitivities of the two independent data sets toward a more unified model. The three dimensional model from our alternating inversion not only shows major features of velocity anomalies and discontinuities in agreement with previous studies, but also reveals small-scale heterogeneities which provide new constraints on the geometry of the Isabella Anomaly and mantle dynamic processes in central California. The proposed alternating inversion scheme can be applied to other regions with similar array deployments for high-resolution lithospheric imaging. |
| first_indexed | 2024-10-01T02:43:54Z |
| format | Journal Article |
| id | ntu-10356/153552 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:43:54Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1535522023-02-28T16:39:38Z Adjoint tomography of ambient noise data and teleseismic P waves : methodology and applications to central California Wang, Kai Yang, Yingjie Jiang, Chengxin Wang, Yi Tong, Ping Liu, Tianshi Liu, Qinya School of Physical and Mathematical Sciences Asian School of the Environment Science::Mathematics Joint Inversion Adjoint Tomography Adjoint tomography has been recently applied to ambient seismic noise and teleseismic P waves separately to unveil fine-scale lithospheric structures beyond the resolving ability of traditional ray-based traveltime tomography. In this study, we propose an inversion scheme that alternates between frequency-dependent traveltime inversions of ambient noise surface waves and waveform inversions of teleseismic P waves to take advantage of their complementary sensitivities to the Earth's structure. We apply our method to ambient noise empirical Green's functions from 60 virtual sources, direct P and scattered waves from 11 teleseismic events recorded by a dense linear array (∼7 km station spacing) and other regional stations (∼40 km average station spacing) in central California. To evaluate the performance of the method, we compare tomographic results from ambient noise adjoint tomography, full-waveform inversion of teleseismic P waves, and the alternating inversion of the two data sets. Both applications to practical field data sets and synthetic checkerboard tests demonstrate the advantage of the alternating inversion over individual inversions as it combines the complementary sensitivities of the two independent data sets toward a more unified model. The three dimensional model from our alternating inversion not only shows major features of velocity anomalies and discontinuities in agreement with previous studies, but also reveals small-scale heterogeneities which provide new constraints on the geometry of the Isabella Anomaly and mantle dynamic processes in central California. The proposed alternating inversion scheme can be applied to other regions with similar array deployments for high-resolution lithospheric imaging. Published version The authors thank the Editor Michael Bostock for handling this manuscript, the Associate Editor Andreas Fichtner and two anonymous reviewers for their constructive suggestions that have improved the manuscript significant-ly. Computations for this study were performed on hardware acquired through the combined funding of Canada Foundation for Innovation (CFI), Ontario Research Fund (ORF), and University of Toronto Startup Fund and partly hosted by the SciNet HPC Consortium. K. Wang (after January 2020) and Y. Yang are supported by the Australian Research Council Discovery Grants DP190102940. K. Wang (before January 2020) and Q. Liu are supported by the NSERC Discovery Grant 487237. This is contribution 1664 from the ARC Center of Excellence for Core to Crust Fluid Systems and 1465 in the GEMOC Key Center. 2021-12-07T01:59:27Z 2021-12-07T01:59:27Z 2021 Journal Article Wang, K., Yang, Y., Jiang, C., Wang, Y., Tong, P., Liu, T. & Liu, Q. (2021). Adjoint tomography of ambient noise data and teleseismic P waves : methodology and applications to central California. Journal of Geophysical Research: Solid Earth, 126(6), e2021JB021648-. https://dx.doi.org/10.1029/2021JB021648 2169-9313 https://hdl.handle.net/10356/153552 10.1029/2021JB021648 2-s2.0-85108941140 6 126 e2021JB021648 en Journal of Geophysical Research: Solid Earth © 2021 American Geophysical Union. All rights reserved. This paper was published in Journal of Geophysical Research: Solid Earth and is made available with permission of American Geophysical Union. application/pdf |
| spellingShingle | Science::Mathematics Joint Inversion Adjoint Tomography Wang, Kai Yang, Yingjie Jiang, Chengxin Wang, Yi Tong, Ping Liu, Tianshi Liu, Qinya Adjoint tomography of ambient noise data and teleseismic P waves : methodology and applications to central California |
| title | Adjoint tomography of ambient noise data and teleseismic P waves : methodology and applications to central California |
| title_full | Adjoint tomography of ambient noise data and teleseismic P waves : methodology and applications to central California |
| title_fullStr | Adjoint tomography of ambient noise data and teleseismic P waves : methodology and applications to central California |
| title_full_unstemmed | Adjoint tomography of ambient noise data and teleseismic P waves : methodology and applications to central California |
| title_short | Adjoint tomography of ambient noise data and teleseismic P waves : methodology and applications to central California |
| title_sort | adjoint tomography of ambient noise data and teleseismic p waves methodology and applications to central california |
| topic | Science::Mathematics Joint Inversion Adjoint Tomography |
| url | https://hdl.handle.net/10356/153552 |
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