Shear-wave tomography of the Changbai volcanic area in NE China derived from ambient noise and seismic surface waves

被引:2
|
作者
Li, Honghao [1 ,2 ]
Tian, You [1 ,2 ]
Zhao, Dapeng [3 ]
Kumar, Rajesh [1 ]
Li, Hongli [1 ]
Yan, Dong [1 ]
Liu, Cai [1 ]
机构
[1] Jilin Univ, Minist Educ, Changbai Volcano Geophys Observ, Changchun 130026, Peoples R China
[2] Jilin Univ, Coll Geoexplorat Sci & Technol, Changchun 130026, Peoples R China
[3] Tohoku Univ, Grad Sch Sci, Dept Geophys, Sendai 9808578, Japan
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
Intraplate volcano; Subduction; Ambient noise; Changbai volcano; Surface wave; Velocity structure; MANTLE TRANSITION ZONE; INTRAPLATE VOLCANISM; NORTHEAST CHINA; CRUSTAL STRUCTURE; STRUCTURE BENEATH; PACIFIC SLAB; VELOCITY STRUCTURE; DEEP SUBDUCTION; ORIGIN; CONSTRAINTS;
D O I
10.1016/j.jseaes.2022.105482
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
A detailed 3-D shear-wave velocity (Vs) model of the crust and upper mantle beneath the Changbai volcano and adjacent areas in NE China is obtained by conducting a joint inversion of group-velocity dispersion curves at periods of 5-30 s and phase-velocity dispersion curves at periods of 5-100 s from ambient noise and earthquake surface waves. We use 1602 group-velocity dispersion curves and 3125 phase-velocity dispersion curves, which were recorded at 57 permanent stations of the China Earthquake Administration and 27 portable stations of Jilin University during 2010 to 2014. Our results reveal strong heterogeneities in the crust and upper mantle beneath the study area. A remarkable low-Vs zone is revealed in the crust beneath the Changbai volcano, indicating a hot magma chamber. The Longgang volcano is also characterized by a low-Vs anomaly reflecting partial melt in the crust. In contrast, there is no notable low-Vs anomaly in the crust beneath the Jingpohu volcano. Previous geological results and our tomographic images suggest that Changbai is a composite volcano, whereas Jingpohu and Longgang are monogenetic volcanoes. Low-Vs zones are revealed in the upper mantle beneath the three active volcanoes, which are interconnected at different depths. Combining the present results with previous findings, we deem that the three active intraplate volcanoes are caused by hot and wet upwelling flows in the big mantle wedge associated with deep subduction of the western Pacific plate beneath NE Asia.
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页数:16
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