地球与行星物理论评（中英文）2025，Vol.56Issue(5)：583-595,13.DOI:10.19975/j.dqyxx.2024-051
利用接收函数PmS和PPmS约束全地壳方位各向异性
Constraining whole crustal azimuthal anisotropy using PmS and PPmS phases of receiver functions
摘要
Abstract
Crustal anisotropy plays a crucial role in the study of seismic activity and crustal dynamic evolu-tion,which is widely constrained based on the periodic variation of moveout of the P-to-S conversion at the Moho(PmS)with respect to the back azimuth in receiver functions(RFs).Due to the uneven distribution of seismic activi-ty,short recording period,complexity of mediums adjacent to the Moho,and presence of ambient noise,some PmS phases in RFs have no well-determined arrivals,which impedes the use of PmS to constrain crustal anisotropy.In this study,we propose a new method of jointly applying PmS and PPmS phases to measure crustal anisotropy para-meters.First,perturbations of moveout caused by presence of azimuthal anisotropy are obtained by averaging those of the PmS and PPmS after subtracting the corresponding values in isotropic cases.After that,those perturbations are plotted against the back azimuth,and fitted using a cosine function.The optimal pair of anisotropy parameters corresponds to the best fitting curve.When PPmS is characterized by a higher signal-to-noise ratio than the PmS,we can only use the former to constrain crustal anisotropy.Tests using synthetic and observed seismic records with various signal-to-noise ratios confirm the applicability of the method in measuring whole crustal azimuthal aniso-tropy.关键词
地壳各向异性/接收函数/莫霍面P-S转换波/地壳多次波Key words
crustal anisotropy/receiver function/Moho P-to-S converted phase/crustal multiples分类
地球科学引用本文复制引用
尤天楠,贾琰,张明,黄培析,张佳政,孔凡圣..利用接收函数PmS和PPmS约束全地壳方位各向异性[J].地球与行星物理论评（中英文）,2025,56(5):583-595,13.基金项目
国家重点研发计划课题资助项目(2023YFC2811203) （2023YFC2811203）
浙江省钱江人才计划资助项目(QJD1902026) （QJD1902026）
中央级公益性科研院所基本科研业务费专项资金项目(QNRC2201) （QNRC2201）
浙江省自然科学基金资助项目(LR24D060001)Supported by the National Key Research and Development Program(Grant No.2023YFC2811203),the Zhejiang Qian-jiang Plan(Grant No.QJD1902026),the Scientific Research Fund of the Second Institute of Oceanography,MNR(Grant No.QNRC2201),and the Zhejiang Provincial Natural Science Foundation of China(Grant No.LR24D060001) （LR24D060001）
