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\begin{document}

\title{The splitting 660 km discontinuity associated with lithospheric
delamination in the northern part of the North-South seismic zone, China}



\author[1]{Chuansong He}%
\affil[1]{Institute of Geophysics China Earthquake Adminstration}%


\vspace{-1em}



  
  \date{May 24, 2024}


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\selectlanguage{english}
\begin{abstract}
The north-south seismic zone (NSSZ) is a destructive zone of large-scale
earthquakes in China, and the earthquake mechanism associated with deep
structures remains unclear. Previous studies have indicated that
lithospheric delamination or absence of lithospheres in the western part
of the NSSZ may facilitate the eastern extrusion of the Tibetan Plateau
and lead to stress accumulation and release. However, the deep process
of lithospheric delamination needs to be further clarified. In this
study, I collect abundant high-quality teleseismic data recorded by
permanent seismic stations and perform common conversion point (CCP)
stacking of receiver functions in the north part of the NSSZ. The
results show that lithospheric delamination might result in the
splitting 660 km discontinuity and a thickening region of the mantle
transition zone (MTZ).%
\end{abstract}%



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\emph{\textbf{Geophysical Research Letters}}

Supporting Information for

\textbf{The splitting 660 km discontinuity associated with lithospheric
delamination in the northern part of the North-South seismic zone,
China}

Chuansong He

\emph{Corresponding author: C.S. He, email: hechuansong@aliyun.com}

\emph{Institute of Geophysics, CEA, Beijing 100081, China}\selectlanguage{english}
\begin{figure}[H]
\begin{center}
\includegraphics[width=0.70\columnwidth]{figures/image2/image2}

\end{center}
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Fig. S1 P-wave velocity perturbation at different depths (He and
Santosh, 2017). Portions of the model are not shown where the recovery
from the input velocity model is below 20\%.\selectlanguage{english}
\begin{figure}[H]
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\includegraphics[width=0.70\columnwidth]{figures/image3/image3}

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Fig. S2. Piercing points at depth of 410 km (a) and at depth of 660 km
(b). Red points: piercing points at depths of 410 km and 660 km. Blue
lines: profiles of P-wave velocity perturbation and CCP stacking
profiles of receiver functions.\selectlanguage{english}
\begin{figure}[H]
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\includegraphics[width=0.70\columnwidth]{figures/image4/image4}

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Fig. S3. Stacking points at 410 km and 660 km discontinuities.\selectlanguage{english}
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\includegraphics[width=0.70\columnwidth]{figures/image5/image5}

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Fig. S4. Crustal thickness (a) and Vp/Vs ratio (b) in the northern part
of the NSSZ. Yellow triangles: seismic stations. Lower Vp/Vs ratios in
the northern part of the NSSZ are generated by a deep process of
lithospheric delamination (He et al., 2014).\selectlanguage{english}
\begin{figure}[H]
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\includegraphics[width=0.70\columnwidth]{figures/image6/image6}

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Fig. S5 Vertical component at each seismic station for the
20120202133440 event.\selectlanguage{english}
\begin{figure}[H]
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\includegraphics[width=0.70\columnwidth]{figures/image7/image7}

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Fig. S6 R and T receiver functions for the QH.LED station.

\textbf{Hosted file}

\verb`essoar.10511173.1.docx`  available at \url{https://authorea.com/users/530576/articles/598233-the-splitting-660-km-discontinuity-associated-with-lithospheric-delamination-in-the-northern-part-of-the-north-south-seismic-zone-china}

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