太原盆地及邻区上地壳各向异性研究  

Study on Upper Crustal Anisotropy in Taiyuan Basin and Adjacent Areas

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作  者:张玲[1,2] 王睿敏 李丽[1,2] 王想[4] ZHANG Ling;WANG Ruimin;LI Li;WANG Xiang(Shanxi Earthquake Agency,Taiyuan,Shanxi 030021,China;National Continental Rift Valley Dynamics Observatory of Taiyuan,Taiyuan,Shanxi030025,China;Hebei University of Engineering,Handan,Hebei 056038,China;Hebei Earthquake Agency,Shijiazhuang,Hebei 050021,China)

机构地区:[1]山西省地震局,山西太原030021 [2]太原大陆裂谷动力学国家野外科学观测研究站,山西太原030025 [3]河北工程大学,河北邯郸056038 [4]河北省地震局,河北石家庄050021

出  处:《山西地震》2025年第1期1-6,12,共7页Earthquake Research in Shanxi

基  金:山西省地震局科研项目(SBK-2323);山西太原大陆裂谷动力学国家野外科学观测研究站项目(NORSTY2023-06)。

摘  要:本文基于2019—2023年山西固定台网记录的地震事件波形资料,采用剪切波分裂计算方法,获得太原盆地及邻区11个地震台站的剪切波分裂参数。结果表明,太原盆地及其附近的台站快剪切波偏振方向一致性较好,整体表现出NE和NEE向的优势分布特征,且南、北存在一定的差异性,台站附近的地震活动主要受断裂分布和区域应力场的控制。太原盆地内部及其边缘断裂附近的台站时间延迟总体小于西侧吕梁山地区,盆地内部表现出较弱的地壳各向异性程度;西侧山区的古交、娄烦地区存在复杂的地质构造环境,具有较大的时间延迟,表现出较强的各向异性特征。Based on the event waveform data recorded by the Shanxi fixed network from 2019 to 2023,the shear wave splitting parameters of 11 seismic stations in the Taiyuan Basin and adjacent areas are obtained by using the shear wave splitting calculation method.The results show that the polarization direction of fast shear waves in the Taiyuan Basin and its nearby stations is consistent with each other,showing the dominant distribution of NE and NEE directions as a whole,and there are some differences in the north and south.The seismic activity near the stations is mainly controlled by the fault distribution and regional stress field.The time delay of the stations in the inner Taiyuan Basin and near the fault margin is smaller than that in the western Lvliangshan area,and the crustal anisotropy in the inner Taiyuan basin is weak.The Gujiao and Loufan areas in the western mountainous area have complex geological structure environment,with large time delay and strong anisotropy characteristics.

关 键 词:太原盆地及邻区 上地壳各向异性 快波偏振方向 慢波时间延迟 

分 类 号:P315.727[天文地球—地震学]

 

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