Premium
Shallow magma chamber under the Wudalianchi Volcanic Field unveiled by seismic imaging with dense array
Author(s) -
Li Zhiwei,
Ni Sidao,
Zhang Baolong,
Bao Feng,
Zhang Senqi,
Deng Yang,
Yuen David A.
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl068895
Subject(s) - geology , volcano , seismology , magma chamber , magma , magnetotellurics , seismic tomography , phreatic eruption , seismometer , intraplate earthquake , geophysics , petrology , mantle (geology) , electrical resistivity and conductivity , tectonics , engineering , electrical engineering
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 km 3 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.