L-Q-T坐标下的P波与S波接收函数联合反演
投稿时间:2022-03-04  修订日期:2022-04-10  点此下载全文
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黄思涵 中国地质科学院 100037
中文摘要:接收函数分析是一种研究壳幔结构的主要技术手段。然而,沉积层引起的多次波会影响壳幔结构特征的可靠研究。与常规Z-R-T坐标下提取接收函数不同,本文尝试在L-Q-T坐标下提取P波与S波接收函数,并将二者进行联合反演。通过正演模拟讨论了沉积层厚度对接收函数的影响和实例分析位于具有巨厚沉积的渭河盆地和河套盆地的两个台站,验证了L-Q-T坐标下提取的P波接收函数能有效显示浅部地壳信息(如沉积层转换波信号),而P波与S波接收函数联合反演能够有效压制沉积层引起的多次波信号。显示了联合反演方法更具优势,除能获得界面深度信息,还能获取速度信息。
中文关键词:L-Q-T坐标,接收函数提取,联合反演,沉积层多次波,壳幔结构
 
The joint inversion of P-wave receiver functions and S-wave receiver functions based on the L-Q-T coordinate system
Abstract:Receiver function analysis is a routine method for studying the crustal and upper structures. However, the sedimentary multiples can make malicious effects on determining the crustal and upper mantle structures accurately. In this article, we retrive the receiver functions based on the L-Q-T coordinate system. Then to conduct the joint inversion of P-wave receiver function (PRFs) and S-wave receiver function (SRFs) to prove the advantages of this joint inversion method by giving the case studies of Weihe graben and Hetao graben, as well as the illustrative case of the forward modeling results. Our results on one hand to prove that L-Q-T coordinate system can present the shallow converted crustal signals (e.g., the converted signal of sedimentary layer), and on another hand to support that the simultaneous inversion method has more advantages for suppressing the sedimentary multiples to better determine the crustal and upper mantle structures.
keywords:L-Q-T coordinate system, Receiver functions, Joint inversion, Sedimentary multiples, Crustal and upper mantle structures
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