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Earth, Planets and Space
Fig. 5 | Earth, Planets and Space

Fig. 5

From: Application of a simplified calculation for full-wave microtremor H/V spectral ratio based on the diffuse field approximation to identify underground velocity structures

Fig. 5

H/Vs, imaginary parts of the Green’s function in the vertical component and vertical medium responses of Rayleigh waves from fundamental mode to 25th higher mode. The depth of upper interface of cap layer is 100λ 0. Left: FW H/V (thick black) for target two-layered medium (V s2 = 8V s1), and SW H/V (red) for cap-layered medium (V sCap = 2V s2, Depth = 100λ 0). Middle: imaginary parts of the Green’s function of FW (thick black) in the vertical component for target two-layered medium and that of SW (red) for cap-layered medium. Right: vertical medium responses of Rayleigh waves for fundamental mode (black), first higher mode (red), fifth higher mode (blue), 10th higher mode (cyan), 20th higher mode (thin black), and 25th higher mode (purple). For clarity, medium responses are depicted for only six modes. The medium responses below 0.2Tp0 are omitted because the calculation becomes rather difficult when the dispersion curves of higher modes are quite close to one another at very short periods

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