对模型合成的理论接收函数进行主成分分析，研究在倾斜界面和各向异性影响下主成分形态变化规律，分析倾斜界面倾角和各向异性强度对接收函数R分量主成分贡献率的影响。对江西余干地震台的接收函数R分量主成分进行分析，结果发现：Ps震相的平均走时为3.4 s；台站下方介质的各向异性和倾斜界面同时存在，各向异性快轴大致呈NE向，倾斜界面倾向约170°。
Based on principal component analysis of theoretical receiver functions synthesized for a given model, the morphological variation characteristics of the principal component caused by an inclined interface and anisotropy is studied. The influence of the interface inclination angle and the anisotropy magnitude on the principal component contribution rate to the R component receiver function is analyzed. Principal component analysis of the R component receiver functions at Yugan Seismic Station in Jiangxi Province shows that both anisotropy and inclined interfaces exist simultaneously below the station. The average travel time of the Ps wave is 3.4 seconds. The fast axis direction of anisotropy is about NE, and the inclination angle of the Moho interface is about 170 degrees.
2020,41(3): 23-30 收稿日期：2020-01-03
DOI：10.3969/j.issn.1003-3246.2020.03.003
基金项目：中国地震局地震科技星火计划（项目编号：XH20030Y）
作者简介：查小惠(1989-),男,江西鄱阳人,工程师,主要从事地球物理监测工作。E-mail:zhaxiaohuiouc@163.com
参考文献：
陈佩. 主成分分析法研究及其在特征提取中的应用[D]. 西安:陕西师范大学,2014.
张建勇,陈凌,王旭. 基于接收函数主成分分析法的地壳结构研究[J]. 中国科学:地球科学,2019,49(5):822-837, doi:10.1360/N072018-00227.
赵秀红. 基于主成分分析的特征提取的研究[D]. 西安:西安电子科技大学,2016.
Bianchi I, Park J, Agostinetti N P, et al. Mapping seismic anisotropy using harmonic decomposition of receiver functions:An application to Northern Apennines, Italy[J]. J Geophys Res Solid Earth, 2010, 115(B12):B12317.
Frederiksen A W, Bostock M G. Modelling teleseismic waves in dipping anisotropic structures[J]. Geophys J Int, 2000, 141(2):401-412.
Herrmann R B, Ammon C J. Computer programs in seismology[Z]. St Louis, Missouri:Department of Earth and Atmospheric Sciences, Saint Louis University, 2004.
Langston C A. Structure under Mount Rainier, Washington, inferred from teleseismic body waves[J]. J Geophys Res Solid Earth, 1979, 84(B9):4 749-4 762.
Ligorría J P, Ammon C J. Iterative deconvolution and receiver-function estimation[J]. Bull Seismol Soc Am, 1999, 89(5):1 395-1 400.
Liu H F, Niu F L. Estimating crustal seismic anisotropy with a joint analysis of radial and transverse receiver function data[J]. Geophys J Int, 2012, 188(1):144-164.
Owens T J, Zandt G, Taylor S R. Seismic evidence for an ancient rift beneath the Cumberland plateau, Tennessee:a detailed analysis of broadband teleseismic P waveforms[J]. J Geophys Res Solid Earth, 1984, 89(B9):7 783-7 795.
Zhu L P, Kanamori H. Moho depth variation in southern California from teleseismic receiver functions[J]. J Geophys Res Solid Earth, 2000, 105(B2):2 969-2 980.
