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Adjoint tomography has recently been applied to ambient noise data as a new and promising tomographic method that utilizes simulation-based 3-D sensitivity kernels rather than ray theory used in traditional ambient noise tomography. However, to date, most studies of ambient noise adjoint tomography only use vertical-component Rayleigh waves. In this study, we develop a theoretical framework for calculating sensitivity kernels for multicomponent empirical Green's functions extracted from ambient noise data. Under the framework of the adjoint method, we demonstrate that a horizontal component (transverse-transverse or radial-radial) kernel can be constructed from the interaction of wave fields generated by point-force sources acting in the north and east directions based on rotation relationships. Our method is benchmarked for a 3-D heterogeneous isotropic model by comparing rotated seismograms, individual, and event traveltime misfit kernels with corresponding references computed by numerical simulations with sources directly placed in the radial or transverse directions. Based on our new method, we perform the first Love-wave ambient noise adjoint tomography in southern California and construct an improved VSH model. Our method for computing sensitivity kernels of multicomponent empirical Green's functions provides the basis for multicomponent ambient noise adjoint tomography in imaging radially anisotropic shear-wave velocity structures.
|Number of pages||17|
|Journal||Journal of Geophysical Research: Solid Earth|
|Publication status||Published - Jun 2019|
Bibliographical noteCopyright 2019 American Geophysical Union.
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How the Earth moves: Developing a novel seismological approach to map the small-scale dynamics of the upper mantle
Yang, Y., MQRES, M. & MQRES (International), M.
20/01/14 → …
Unveiling the fine structure of the Australian continent using ocean waves
Yang, Y., Afonso, J. C., Rawlinson, N. & Niu, F.
27/05/19 → 26/05/22