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\begin{document}

\title{Sedimentary structure derived from multi-mode ambient noise tomography
with dense OBS network at the Japan Trench}



\author[1,1]{Lina Yamaya}%
\author[2,2]{Kimihiro Mochizuki}%
\author[1,1]{Takeshi Akuhara}%
\author[3,3]{Kiwamu Nishida}%
\affil[1]{Earthquake Research Institute, The University of Tokyo}%
\affil[2]{University of Tokyo}%
\affil[3]{Earthquake Research Institute, University of Tokyo}%


\vspace{-1em}



  
  \date{May 24, 2024}


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\begin{abstract}
We derive the 3-D S-wave velocity structures of sediments and upper
crust in the region off Ibaraki by applying ambient noise tomography to
a dense array of short-period ocean bottom seismometers (OBSs). The
cross-spectra were calculated using 27- or 142-day continuous seismic
data, and the phase velocities of the fundamental and the first-higher
Rayleigh wave modes are obtained in the frequency ranges of 0.1--0.25 Hz
and 0.17--0.3 Hz, respectively. Our 1-D S-wave velocity inversion based
on the trans-dimensional Markov chain Monte Carlo method revealed
multiple sedimentary layers above the acoustic basement and the upper
crustal structure. The 1-D structure was then used as a reference model
to conduct ambient noise tomography and non-linear inversion of the 3-D
S-wave velocity structure by collecting data of the local 1-D S-wave
velocity structure. Our 3-D S-wave velocity structure revealed three
main points: (1) The acoustic basement is situated at a depth of
\textasciitilde{}4 km depth; (2) the crustal structure is more complex
than the that of the sedimentary layers; and (3) the southern region has
a complex crustal structure in which subducting seamounts were
identified by previous P-wave velocity tomographies.%
\end{abstract}%



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