长白山及邻区地壳、上地幔顶部三维速度结构  

Three-Dimension Velocity Structure of Crust and Upper Mantle in Changbai Mountain and Its Adjacent Areas

作　　者：冯晅[1] 迟唤昭[1] 刘财[1] 田有[1] 柳云龙[1] 郑确[1] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026

出　　处：《吉林大学学报（地球科学版）》2013年第3期983-992,共10页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(41174068);国家"973"计划项目(2009CB219301);公益性行业科研专项项目(201011078);油页岩勘探开发利用产学研用合作创新研究项目(OSP-02;OSR-02)

摘　　要：根据沿长白山布设的宽频带流动地震台站及吉林省地震台网所记录的近震P波走时数据,利用层析成像方法对长白山及邻区(39°N-45°N、122°E-130°E)深至40km的地壳和上地幔顶部三维速度结构进行了研究。结果表明:地震的发生和分布多集中于断裂等复杂地质构造。利用较高分辨率的地壳、上地幔顶部三维速度结构证实了长白山火山区岩浆囊存在,并推测岩浆囊的位置位于火山口的西南方向,深度为10～40km。壳内岩浆囊分布对进一步解释、认识火山灾害提供了重要的深部信息。According to the travel time data of P-arrivals recorded by seismic networks array along the Changbai Mountain and the permanent stations of Jilin Province,the 3D P-wave velocity structure of the crust and upper mantle down to 40 km depth beneath Changbai volcano and its adjacent areas（39°N-45°N,122°E-130°E） is reconstructed by seismic tomography method.The result shows that earthquake occurrence and distribution is focused on fault and other geological structures.We prove the existence of magma systems and guess that magma systems is located in the southwest of the crater,a depth of 10 to 40 km by three-dimension high resolution P-wave velocity structure in the crust and upper mantle.The presence and distribution of magma systems in the crust provides important evidence for further explaining and understanding of volcano activity.

关 键 词：长白山 火山 地壳和上地幔 地震层析成像 岩浆囊 

分 类 号：P631.4[天文地球—地质矿产勘探]