Study on seismic anisotropy based on receiver function analysis at Yugan station
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摘要: 首先基于理论地层模型，分析使用径向切向接收函数集联合反演地壳各向异性程序的可行性和可靠性。然后将该程序应用到余干地震台接收函数的实际分析中，结果显示，不同目标函数计算得到的快波偏振方向和时间延迟存在差异，联合目标函数结果表明，余干地震台快波方向约为79°，时间延迟约为0.19 s。Abstract: First of all, based on the theoretical crustal model, the feasibility and reliability of using the radial and transverse receiver functions to jointly invert the crustal anisotropy program are analyzed. Then the program is applied to the actual analysis of the receiver functions of Yugan seismic station. The results show that the polarization direction and time delay of the fast wave calculated by different objective functions are different. The joint objective function shows that the fast wave direction of Yugan seismic station is about 79° and the time delay is about 0.19 s.
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Key words:
- receiver function /
- radial receiver function /
- transverse receiver function /
- anisotropy
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表 1 计算接收函数的地层模型
Table 1. Models used for receiver function modeling
地层厚度/m 密度 g/cm3 vP/m·s−1 vS/m·s−1 F %P %S Tr Pl Str Dip A组各向异性 20 000 2 720 6 100 3 500 1 0 0 0 0 0 0 A1 20 000 2 720 6 100 3 500 0 6 6 0 0 0 0 0 3 300 8 200 4 600 1 0 0 0 0 0 0 20 000 2 720 6 100 3 500 1 0 0 0 0 0 0 A2 20 000 2 720 6 100 3 500 0 6 6 45 0 0 0 0 3 300 8 200 4 600 1 0 0 0 0 0 0 注：F取值0、1，0表示该层为各向异性层，1表示该层为各向同性层，%P和%S分别为P波和S波的各向异性程度，Tr为快轴方向的水平投影与正北方向的夹角，Pl为快轴方向与铅锤方向的夹角，Str为倾斜界面的走向（倾向为走向加90°），Dip为倾斜界面的倾角 
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