基于谐波分解的余干地震台接收函数研究  

Study on Receiver Functions of Yugan Seismic Station Based On Harmonic Decomposition

作　　者：查小惠 赵影 曾文敬 罗丽 郭雨帆 ZHA Xiaohui;ZHAO Ying;ZENG Wenjing;LUO Li;GUO Yufan(Jiangxi Earthquake Agency,Nanchang 330026,China)

机构地区：[1]江西省地震局,南昌330026

出　　处：《华南地震》2020年第3期27-33,共7页South China Journal of Seismology

基　　金：中国地震局地震科技星火计划项目(XH20030Y)。

摘　　要：基于各向异性介质下Pms震相到时的理论公式和理论地层模型,验证了谐波分解方法求取地壳各向异性参数的可行性和可靠性。将该方法应用到余干地震台,发现余干地震台不同方位角接收函数Pms震相存在明显的到时差,谐波分解结果表明台站下方各向异性快波方向约为83°,时间延迟约为0.28 s。快波方向和前人研究余干台的SKS分裂结果较为一致,支持华南地区壳幔耦合变形的观点。水平轴各向异性模型参数只能部分解释Pms到时差异,完整的解释需要进一步考虑界面倾斜和倾斜轴各向异性等情况。Based on the theoretical formula of the arrival time of the seismic phase of Pms in anisotropic medium and the theoretical stratigraphic model,the feasibility and reliability of the harmonic decomposition method to obtain the anisotropic parameters of the crust are verified.Applying this method to Yugan seismic station,it is found that there is obvious arrival time difference in different azimuth receiver functions of Pms phase in Yugan seismic station.The results of harmonic decomposition show that the direction of anisotropic fast wave under the station is about 83°and the time delay is about 0.28 s.The direction of the fast wave is consistent with the SKS splitting results of previous studies,which supports the viewpoint of crust mantle coupling deformation in South China.The parameters of horizontal axis anisotropic model can only partially explain the time difference of Pms,and the complete interpretation needs to further consider the interface tilt and tilt axis anisotropy.

关 键 词：接收函数 谐波分解 各向异性 

分 类 号：P315[天文地球—地震学]