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\title{Upper-mantle anisotropy in the southeastern margin of the Tibetan
Plateau revealed by fullwave SKS splitting intensity tomography}



\author[1]{Yi Lin}%
\author[2]{Li Zhao}%
\affil[1]{Chengdu University of Technology}%
\affil[2]{Peking University}%


\vspace{-1em}



  
  \date{May 07, 2026}


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\begin{abstract}
The southeastern margin of the Tibetan Plateau has undergone complex
deformation since the Cenozoic, resulting in a high level of seismicity
and seismic hazard. Knowledge about the seismic anisotropy provides
important insight about the deformation mechanism and the regional
seismotectonics beneath this tectonically active region. In this study,
we conduct fullwave multi-scale tomography to investigate the seismic
anisotropy in the southeastern margin of the Tibetan Plateau. Broadband
records at 111 permanent stations in the region from 470 teleseismic
events are used to obtain 5,216 high-quality SKS splitting intensity
measurements, which are then inverted in conjunction with 3D sensitivity
kernels to obtain an anisotropic model with multi-scale resolution.
Resolution tests show that our dataset recovers anisotropy anomalies
reasonably well on the scale of 1\selectlanguage{ngerman}º x 1º horizontally and
\textasciitilde{}100 km vertically. Our result suggests that in the
southeastern margin of the Tibetan Plateau the deformation in the
lithosphere and asthenosphere are decoupled. The anisotropy in the
lithosphere varies both laterally and vertically as a result of dynamic
interactions of neighboring blocks as well as lithospheric reactivation.
The anisotropy in the asthenosphere largely follows the direction of
regional absolute plate motion. The SKS splittings observed at the
surface are shown to be consistent with the vertical integral of our
depth-dependent anisotropy model over lithospheric and asthenospheric
depths.{}%
\end{abstract}\selectlanguage{ngerman}%



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