Analysis of Deformation Characteristic and Uplift Mechanism in Longgang Volcanoes, Jilin
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摘要: 吉林龙岗火山区是第四纪活动火山，具有潜在喷发危险。通过GNSS和水准资料分析区域三维地壳运动，得出2011—2019年相对欧亚板块水平运动以东南向为主，速度＜10 mm/a。敦化-密山断裂以东受日本2011年“3·11地震”影响强烈，现以拉张运动为主；近年来水准资料揭示火山区垂直运动以隆升为主。2014—2019年的InSAR资料显示隆升集中在靖宇一带。结合MT剖面反演得到的深部电性结构，龙岗火山区西侧高阻体分布在深度18 km以上，金龙顶子火山下方最浅。中部为早期喷发形成的火山，下方高阻体分布在深度40 km以上，东侧抚松一带分布在深度约20 km以上，地壳范围内的高阻结构表明岩浆已固结。高阻结构层可分辨出断层两侧电阻的差异性。高阻体下方存在大规模低阻结构，推测为中下地壳岩浆系统。金龙顶子火山深度10 km以下的低阻结构可能为岩浆通道，并与中下地壳岩浆系统相连。东侧区域岩浆平均深度约30 km，相对较浅。龙岗火山区幔源物质的上涌及间断性的向上运移引起地壳隆升及地震活动。Abstract: Longgang Volcanoes of Quaternary is active with potential eruption risk. Three-dimensional crustal movement of the region was studied through GNSS and leveling data. The horizontal motions of the GNSS stations are within 10mm/a in SE direction, with respect to the Eurasian plate. The movement of the stations located the east of Dunhua – Mishan fault has been strongly affected by the 3·11 earthquake, 2011 in Japan. The fault is mainly extensional now. Leveling data in recent years reveal that the vertical motion is mainly uplift. The uplift is concentrated in Jingyu by InSAR during 2014—2019. The deep electrical structure is obtained based on the magnetotelluric profile. The results show the high resistivity structures of different depths are distributed in the crust of Longgang Volcanoes and its adjacent area. The high resistivity structures in the western are above 18 km. The depth in Jinlongdingzi volcano is the shallowest. The depth in the middle region is above 40 km where the early volcanoes distributed. The structures in the eastern around FuSong are above 20 km. They are speculated to be related to the consolidation of magma. The different resistivity of the structures can tell the two sides of the faults. The large-scale low resistance structure below the high resistance is supposed the magma system in the middle and lower crust. The youngest volcano, Jinlongjingzi has low resistance structure below 10 km, which is speculated a magma channel which connected to the magma system of the deep. The average depth of the east magma is relatively shallow with 30 km or so. The upwelling of the mantle material and intermittent upward migration in the region may cause the uplift and earthquakes in the crust.
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Key words:
- Horizontal velocity /
- Vertical velocity /
- MT /
- Deformation characteristic /
- Uplift mechanism /
- Longgang volcanoes
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图 1 东北地区水平运动速度场（2011—2019年）
Figure 1. Horizontal velocity field in Northeast China with respect to Eurasia block（2011—2019）
图 3 观测站位移分量时间序列
Figure 3. Time series of E and N displacement component at GNSS observation station（E312）
图 4 水准路线与垂直形变速度
Figure 4. Distributions of the leveling routes and vertical velocities
图 5 利用InSAR技术得到的垂直形变速度（2014年9月—2019年1月）
Figure 5. Vertical velocities by InSAR（2014.09—2019.01）
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