Azimuthal Anisotropy Tomography of the Southeast Asia Subduction System

Yuanyuan Hua, Dapeng Zhao, Yi Gang Xu

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


A detailed 3-D model of P wave isotropic velocity and azimuthal anisotropy beneath SE Asia is obtained by jointly inverting local earthquake arrival times and teleseismic relative travel-time residuals. Our results show that the high-velocity (high-V) subducting Australian slab has penetrated through the mantle transition zone (MTZ) and reached a depth of ∼1,200 km beneath Sumatra, whereas the high-V slab has subducted toward the north and trapped within the MTZ beneath Java. The Hainan mantle plume is revealed clearly as a significant low-velocity anomaly beneath the MTZ, which extends down to the bottom of our model (∼1,600-km depth). The upwelling of the Hainan plume is resisted by the stagnant slab in the MTZ, resulting in divergent fast-velocity directions of azimuthal anisotropy beneath the stagnant slab. The detailed results of seismic tomography and azimuthal anisotropy provide important new information on the complex mantle structure and dynamics of the SE Asian region, in particular, the subducting slabs and the Hainan plume, as well as their interactions.

Original languageEnglish
Article numbere2021JB022854
JournalJournal of Geophysical Research: Solid Earth
Issue number2
Publication statusPublished - 2022 Feb


  • Hainan plume
  • seismic anisotropy
  • seismic tomography
  • stagnant slab
  • subduction zone
  • the SE Asia subduction zone

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science


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