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Deep geophysical anomalies beneath the Changbaishan Volcano
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  • Shaohua Li,
  • Jiaqi Li,
  • Thomas P. Ferrand,
  • tong zhou,
  • Mingda Lv,
  • Ziyi Xi,
  • Ross Maguire,
  • Guangjie Han,
  • Juan Li,
  • Xiyuan Bao,
  • Yiran Jiang,
  • tiezhao bao
Shaohua Li
Lanzhou Institute of Seismology,CEA
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Jiaqi Li
University of California, Los Angeles

Corresponding Author:jli@epss.ucla.edu

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Thomas P. Ferrand
Freie Universität Berlin
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tong zhou
Aramco Research Center Beijing
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Mingda Lv
Michigan State University
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Ziyi Xi
Michigan State University
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Ross Maguire
University of Maryland
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Guangjie Han
China Earthquake Networks Center
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Juan Li
Institute of Geology and Geophysics, Chinese Academy of Sciences
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Xiyuan Bao
University of California, Los Angeles
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Yiran Jiang
Peking University
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tiezhao bao
CNOOC Research Institute
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Subsurface imaging is key to understanding the origin of intraplate volcanos. The Changbaishan volcano, located about 2000 km away from the western Pacific subduction zone, has several debated origins. To investigate this, we compared regional seismic tomography with the electrical resistivity results and performed high-resolution 1D and quasi-2D velocity-depth profiles. We show that the upper mantle is characterized by two anomalies exhibiting distinct features which cannot be explained by the same mechanism. We document a localized low-velocity anomaly atop the 410-km discontinuity, where the P-wave velocity is reduced more than that of the S-wave (i.e., low Vp/Vs). We propose that this anomaly is caused by the reduction of the effective moduli during the phase transformation of olivine. The other anomaly, located between 300 km and 370 km depth, reveals a significant reduction of the S-wave velocity (i.e., high Vp/Vs), associated with a reduction of the electrical resistivity, altogether consistent with partial melting.