利用主成分分析法研究余干地震台接收函数

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°。

Study on receiver functions at Yugan Seismic Station based on principal component analysis

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.