利用SKS波分裂研究上地幔各向异性及其在中国东部的应用  

Study on Upper Mantle Anisotropy Using SKS Wave Splitting and Its Application in Eastern China

作　　者：杨晓瑜[1] 李红谊[1] 吴萍萍[1] 张冰[1] 李信富[1] 李佳鹏[1] 

机构地区：[1]中国地质大学(北京)地球物理与信息技术学院,北京100083

出　　处：《地震工程学报》2016年第A01期55-64,共10页China Earthquake Engineering Journal

基　　金：国家自然基金项目(41374057);教育部"新世纪优秀人才支持计划";中国地质调查局地调项目(1212011220244);中央高校基本科研业务费专项资金

摘　　要：地震各向异性方法是研究地幔流动以及岩石圈变形最直接有效的方法之一,利用远震事件识别近乎垂直入射的SKS波震相能直接反映台站下方的上地幔各向异性。近年来,SKS波分裂由于识别方位各向异性灵敏、多解性小逐渐发展为探究大陆动力学及其演化以及地幔形变特征的有力工具。本文收集了近20年来利用SKS波分裂在中国东部地区开展的各向异性研究工作,综述了该方法在中国东部的研究进展以及存在的不足和有待解决之处;同时,还通过在长江中下游地区布设的102个高质量高密度的宽频流动台站以及中国国家数字地震区域台网262个固定台站的数据,详细分析了该地区的上地幔各向异性变形特征。bSeismic anisotropy is one of the most direct and valid ways to study mantee flow and lithospheric deformation. Using teleseismic events to identify SKS phases, which travel along an almost perpendicular ray path, can directly reveal the upper mantle anisotropy beneath receiver stations. In recent years, the SKS wave splitting measurement has gradually become a useful tool to investigate continental dynamics and its evolution, as well as the characteristics odeformation, since this measurement is sensitive to azimuthal anisotropy and characterized by low ambiguity. In the present study, we assemble the SKS wave splitting results in Eastern China of the last 20 years and discuss their evolution in Eastern China and their deficiencies and problems to be solved. This high-quality and high-density seismic network includes 102 broadband tempora-ry stations located in the middle-lower Yangtze River and 262 permanent stations igion operated by China National Digital Seismograph Network. Our results refine the deformation characteristics of the upper mantle anisotropy.

关 键 词：SKS波分裂 上地幔 各向异性 中国东部地区 

分 类 号：P542.5[天文地球—构造地质学]