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Anisotropic Properties of the Earth’s Velocity Structure in Shikoku Island, Japan: Insights from Receiver Function Analysis and Shear Wave Splitting
  • yihuan ruan,
  • Yoshihiro Ito,
  • Yasunori Sawaki
yihuan ruan
Kyoto University

Corresponding Author:ruan.yihuan.86s@st.kyoto-u.ac.jp

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Yoshihiro Ito
Kyoto University
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Yasunori Sawaki
National Institute of Advanced Industrial Science and Technology (AIST)
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The anisotropic properties of the Earth’s velocity structure can be revealed through a combination of receiver function (RF) analysis and shear wave splitting. The splitting parameters, fast polarization direction (FPD) and split time, are used to infer the anisotropic properties. We utilized seismograms from stations on Shikoku Island, Japan, and applied the Bayesian information criterion to constrain the model size of the RF. We showed different anisotropic properties between northern and southern areas corresponding to the Median Tectonic Line. In the southern part, the FPDs were sub-perpendicular to the plunge of the subducting slab, while in the northern part, the FPDs were sub-parallel to the plunge of the slab. Our results indicate that anisotropic strengths are weaker in the tectonic tremor-band in northwestern Shikoku and stronger in the northern part of central and eastern Shikoku around the no-tectonic-tremor area. These anisotropic variations may reveal the geological structure under Shikoku Island.
18 May 2023Submitted to ESS Open Archive
25 May 2023Published in ESS Open Archive