The Wudalianchi Volcano Field (WDF) is a typical intraplate volcano in northeast China with generation mechanism not yet well understood. As its last eruption was around 300 years ago, the present risk for volcano eruption is of particular public interest. We have carried out a high-resolution ambient noise tomography to investigate the location of magma chambers beneath the volcanic cones with a dense seismic array of 43 seismometers and ~ 6 km spatial interval. Significant low-velocity anomalies up to 10% are found at 7–13 km depth under the Weishan volcano, consistent with the pronounced high electrical-conductivity anomalies from previous magnetotelluric survey. We propose these extremely low velocity anomalies can be interpreted as partial melting in a shallow magma chamber with volume at least 200 km3 which may be responsible for most of the recent volcanic eruptions in WDF. Therefore, this magma chamber may pose a serious hazard for northeast China.
Bibliographical noteFunding Information:
Data employed in this study were from the archives of State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, which operates and archives data from the dense seismic array in Wudalianchi Volcanic Filed. The seismic data eventually will be publicly accessible. We thank Li Zhao and Huajian Yao for their helpful comments on this study. This study is supported by China Geological Survey (12120114025001), XDB06030203, NSFC41304045, and 2014CB845903, 2013CB733204, XH15014Y, and Youth Innovation Promotion Association CAS. We appreciate the constructive and critical reviews by the Editor, Jeroen Ritsema, and two anonymous reviewers.
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- Wudalianchi Volcano Field
- ambient noise tomography
- dense seismic array
- magma chamber
- shear wave velocity