| 沂沭断裂带及邻区双差层析成像 |
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| 引用本文： | 刘承雨,张正帅,李国一.沂沭断裂带及邻区双差层析成像[J].大地测量与地球动力学,2022,42(2):176-181. |
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| 作者姓名： | 刘承雨 张正帅 李国一 |
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| 作者单位： | 山东省地震局,济南市文化东路20号,250014;河北省地震动力学重点实验室,河北省三河市学院街465号,065201;山东省地震局,济南市文化东路20号,250014 |
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| 基金项目： | 河北省地震动力学重点实验室开放基金(FZ212204);中国地震局地震科技星火计划(XH20034Y)。 |
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| 摘 要： | 利用双差层析成像方法,选取2008-10～2017-12山东及周边区域182个地震台站记录的1190个近震观测资料,对沂沭断裂带及邻区的震源位置和三维速度结构进行联合反演.结果表明,沂沭断裂带内部介质速度结构具有明显的不均匀性,并呈现分段特性;在郯城和莒县中上地壳内存在明显的低速结构;胶南地块总体速度低于鲁西地块;鲁西...
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| 关 键 词： | 沂沭断裂带 双差层析成像 三维速度结构 地震活动性 |
Crustal Structure beneath the Yishu Fault Zone and Adj acent Areas Revealed by Double-Difference Tomography |
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| LIU Chengyu,ZHANG Zhengshuai,LI Guoyi.Crustal Structure beneath the Yishu Fault Zone and Adj acent Areas Revealed by Double-Difference Tomography[J].Journal of Geodesy and Geodynamics,2022,42(2):176-181. |
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| Authors: | LIU Chengyu ZHANG Zhengshuai LI Guoyi |
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| Institution: | (Shandong Earthquake Agency,20 East-Wenhua Road,250014 Ji’nan,China;Hebei Key Laboratory of Earthquake Dynamics,465 Xueyuan Street,Sanhe 065201,China) |
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| Abstract: | Using 1 190 local earthquake events recorded by 182 permanent stations from October 2008 to December 2017, we apply the double-difference tomography method to relocate seismic events and invert 3-D seismic velocity structure of Yishu fault zone and adjacent areas. The tomography results show that the P-wave velocity structure of Yishu fault zone has significant inhomogeneity and obvious segmentation features. The upper and middle crust of Tancheng and Juxian has low velocity anomalies. The velocity of Jiaonan block is generally lower than Luxi block. The upper and middle crust of the Taishan area in Luxi block basically shows high-velocity structures. In terms of seismicity, most earthquakes occur in low-velocity structures or transition zones between high-speed zones and low-speed zones with a depth of 5 to 20 km. The brittle rock is easy to rupture under the effect of upper mantle heat upwelling, which causes the deep stress to be transmitted to the crust, and then leads to the shallow earthquakes. |
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| Keywords: | Yishu fault zone double-difference tomography 3D velocity structure seismicity |
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