| 辽宁及邻区S波速度结构反演 |
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| 引用本文： | 冯 策,焦明若,于海英,李世林.辽宁及邻区S波速度结构反演[J].大地测量与地球动力学,2022,42(8):829-834. |
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| 作者姓名： | 冯 策 焦明若 于海英 李世林 |
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| 摘 要： | 利用辽宁及邻区70台地震仪2012年噪声连续波形记录，基于背景噪声层析成像法获取研究区下方10~40 s的相速度结构。利用得到的基阶面波相速度频散曲线，通过马尔科夫链蒙特卡洛(MCMC)法反演研究区下方10~40 km深度处的三维S波速度结构。结果表明，研究区浅层及中上地壳的S波速度分布与地形地貌有较好的对应关系，高低速过渡带更易形成孕震区。中下地壳至上地幔顶部的S波速度结构更多受控于莫霍面的起伏状态及深大断裂。海城至大连最后延伸至辽东湾的区域下方30~40 km深度范围内一直存在一个“弧形”的低速异常体，推测该区域存在热物质上涌现象。纵剖面C-C′的辽阳至伊通段下方15 km处存在椭圆形低速体。
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| 关 键 词： | 噪声成像 互相关 辽宁及邻区 S波速度结构 壳幔结构 |
Inversion of S-wave Velocity Structure in Liaoning and Adjacent Areas |
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| FENG Ce,JIAO Mingruo,YU Haiying,LI Shilin.Inversion of S-wave Velocity Structure in Liaoning and Adjacent Areas[J].Journal of Geodesy and Geodynamics,2022,42(8):829-834. |
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| Authors: | FENG Ce JIAO Mingruo YU Haiying LI Shilin |
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| Abstract: | We obtain the 10-40 s phase velocity structure of the study area based on the ambient noise tomography method and records from 70 stations in Liaoning and adjacent areas in 2012. The 3D S-wave velocity structure of 10 - 40 km below the study area is inferred by Markov Chain Monte Carlo(MCMC) method using the obtained base-order surface wave phase velocity dispersion curves. The results show that the S-wave velocity distribution in the shallow, middle and upper crust of the study area corresponds well with the topography, and the transition zone between high and low velocities is more likely to be the seismogenic zone. The S-wave velocity structure in the middle and lower crust to the top of the upper mantle is more controlled by the undulating state of the Moho surface and the deep major fractures. At 30 - 40 km depth in the area from Haicheng to Dalian and finally to Liaodong bay, there is an “arc-shaped” low velocity anomaly, and we infer that there is thermal material upwelling in this area. An elliptical low-velocity body occurs 15 km below the Liaoyang to Yitong section of longitudinal profile C-C′. |
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| Keywords: | ambient noise tomography cross-correlations Liaoning and adjacent areas S-wave velocity structure crust-mantle structure |
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